com0com-user — Questions and answers regading the use of com0com

Re: [Com0com-user] com0com Installation Issue (Code 52) with Secure Boot Enabled on Windows 10

[Foad S. F. <f.s...@gm...>]

Additional Troubleshooting Performed:

1. Extracted the certificate from the signed com0com.sys driver and
manually added it to both the "Trusted Publishers" and "Root" certificate
stores in Windows.
2. Copied the com0com.cat catalog file to the Windows catalog directory
(CatRoot).
3. Modified the driver signing policy in the registry.
4. Found that despite all these attempts, Windows still rejects the driver
with error 577: "Windows cannot verify the digital signature for this file."
5. The ports are successfully created in the system (CNCA0/CNCB0 and
CNCA1/CNCB1) and appear in Device Manager, but they remain unusable due to
the signature verification failure.

Conclusion:

Despite using the officially signed package
(com0com-3.0.0.0-i386-and-x64-signed.zip), it appears that the signature
used for com0com does not meet the specific requirements for Secure Boot
compatibility. While the driver is signed (and validated as such by
certificate tools), Windows is rejecting it as incompatible with the Secure
Boot policy.

I'm curious if others have successfully used com0com with Secure Boot
enabled on Windows 10, or if this is a known limitation of the current
signed driver package.

On Tue, Apr 1, 2025 at 11:59 AM Foad Sojoodi Farimani <
f.s...@gm...> wrote:

> Hello com0com Developers and Users,
>
> Following questions here <https://stackoverflow.com/q/79545926/4999991>,
> here <https://sourceforge.net/p/com0com/code/>, and here
> <https://superuser.com/q/1889354/588662>, I'm seeking assistance with
> installing the com0com virtual serial port driver on my Windows 10 system.
> I am encountering the "Code 52" error (Windows cannot verify the digital
> signature) for the com0com devices, preventing the driver from loading.
>
> My Environment:
>
>    - Operating System: Windows 10 (Latest Updates)
>    - Secure Boot: Enabled (Policy prevents disabling it)
>    - BitLocker: Active
>
>
> Background:
>
> I initially installed com0com via a Chocolatey package which, I later
> discovered, used an older, unsigned driver version. This caused persistent
> issues. I have since corrected the Chocolatey package
> <https://github.com/Foadsf/com0com-chocolatey> to use the official
> *com0com-3.0.0.0-i386-and-x64-signed.zip* package.
>
> However, even after attempting a thorough uninstallation, I cannot get the
> signed driver to install correctly. On a clean virtual machine, installing
> the signed package correctly prompts with the "Windows Security - Would you
> like to install this device software?" dialog showing "Publisher:
> CyberCircuits".
>
> [image: vmconnect_C5FFYI4RGe.png]
>
> On my physical machine, this prompt does not appear, and the installation
> ultimately fails to load the driver, often resulting in the service failing
> to start with error %%577 or devices showing Code 52 in Device Manager.
>
> Troubleshooting Performed:
>
> Attempted uninstall using setupc.exe uninstall from the signed package
> directory (run as Administrator). The command output indicated successful
> removal of devices, the service, registry keys, driver files (oemXX.inf
> packages), and the custom class GUID.
>
> Verified service removal with sc.exe delete com0com (reports service
> doesn't exist).
>
> Verified device instance removal using pnputil /enum-devices targeting
> com0com hardware IDs and class GUIDs (reports no devices found).
>
> Attempted to enable Test Signing mode using bcdedit /set testsigning on,
> but this fails with the error: "The value is protected by Secure Boot
> policy and cannot be modified or deleted." This confirms Secure Boot is
> preventing the standard workaround for test-signed drivers.
>
> Manually deleted associated registry keys and driver files (though setupc
> uninstall seems to handle this now).
>
> Rebooted the system multiple times between uninstallation and
> reinstallation attempts.
>
> Current Problem:
>
> Despite the seemingly successful cleanup using setupc uninstall, when I
> run the signed setup.exe (interactively, as Administrator), it proceeds
> without showing the Windows Security trust prompt for the CyberCircuits
> publisher. The installation finishes, but the devices remain unusable with
> the Code 52 error.
>
> The Core Challenge:
>
> I cannot disable Secure Boot due to system policies. I need com0com to
> function using the provided signed driver under these constraints.
>
> Questions:
>
> Is there a more definitive method (perhaps using pnputil or registry edits
> beyond what setupc does) to absolutely guarantee that all remnants of the
> previous unsigned driver installation are purged, ensuring Windows only
> considers the new signed package during installation?
>
> Is the signed com0com-3.0.0.0 driver known to install and function
> correctly on a Windows 10 system with Secure Boot enabled without requiring
> Test Signing mode? (I assume the signature should allow this, hence the
> expected trust prompt).
>
> Could there be a conflict with the certificate store or a specific Windows
> update that might interfere with recognizing the CyberCircuits signature,
> even if Secure Boot itself isn't directly blocking that specific signature
> (but rather blocking the attempt to enable Test Signing)?
>
> Are there any known workarounds or alternative installation methods for
> this specific scenario (signed driver, Secure Boot enabled and locked)?
>
> Any insights or suggestions would be greatly appreciated. I'm happy to
> provide further logs or details if needed.
>
> Thank you for your time and expertise.
>
> Best regards,
> F.
>

[Com0com-user] com0com Installation Issue (Code 52) with Secure Boot Enabled on Windows 10

[Foad S. F. <f.s...@gm...>]

Hello com0com Developers and Users,

Following questions here <https://stackoverflow.com/q/79545926/4999991>,
here <https://sourceforge.net/p/com0com/code/>, and here
<https://superuser.com/q/1889354/588662>, I'm seeking assistance with
installing the com0com virtual serial port driver on my Windows 10 system.
I am encountering the "Code 52" error (Windows cannot verify the digital
signature) for the com0com devices, preventing the driver from loading.

My Environment:

   - Operating System: Windows 10 (Latest Updates)
   - Secure Boot: Enabled (Policy prevents disabling it)
   - BitLocker: Active


Background:

I initially installed com0com via a Chocolatey package which, I later
discovered, used an older, unsigned driver version. This caused persistent
issues. I have since corrected the Chocolatey package
<https://github.com/Foadsf/com0com-chocolatey> to use the official
*com0com-3.0.0.0-i386-and-x64-signed.zip* package.

However, even after attempting a thorough uninstallation, I cannot get the
signed driver to install correctly. On a clean virtual machine, installing
the signed package correctly prompts with the "Windows Security - Would you
like to install this device software?" dialog showing "Publisher:
CyberCircuits".

[image: vmconnect_C5FFYI4RGe.png]

On my physical machine, this prompt does not appear, and the installation
ultimately fails to load the driver, often resulting in the service failing
to start with error %%577 or devices showing Code 52 in Device Manager.

Troubleshooting Performed:

Attempted uninstall using setupc.exe uninstall from the signed package
directory (run as Administrator). The command output indicated successful
removal of devices, the service, registry keys, driver files (oemXX.inf
packages), and the custom class GUID.

Verified service removal with sc.exe delete com0com (reports service
doesn't exist).

Verified device instance removal using pnputil /enum-devices targeting
com0com hardware IDs and class GUIDs (reports no devices found).

Attempted to enable Test Signing mode using bcdedit /set testsigning on,
but this fails with the error: "The value is protected by Secure Boot
policy and cannot be modified or deleted." This confirms Secure Boot is
preventing the standard workaround for test-signed drivers.

Manually deleted associated registry keys and driver files (though setupc
uninstall seems to handle this now).

Rebooted the system multiple times between uninstallation and
reinstallation attempts.

Current Problem:

Despite the seemingly successful cleanup using setupc uninstall, when I run
the signed setup.exe (interactively, as Administrator), it proceeds without
showing the Windows Security trust prompt for the CyberCircuits publisher.
The installation finishes, but the devices remain unusable with the Code 52
error.

The Core Challenge:

I cannot disable Secure Boot due to system policies. I need com0com to
function using the provided signed driver under these constraints.

Questions:

Is there a more definitive method (perhaps using pnputil or registry edits
beyond what setupc does) to absolutely guarantee that all remnants of the
previous unsigned driver installation are purged, ensuring Windows only
considers the new signed package during installation?

Is the signed com0com-3.0.0.0 driver known to install and function
correctly on a Windows 10 system with Secure Boot enabled without requiring
Test Signing mode? (I assume the signature should allow this, hence the
expected trust prompt).

Could there be a conflict with the certificate store or a specific Windows
update that might interfere with recognizing the CyberCircuits signature,
even if Secure Boot itself isn't directly blocking that specific signature
(but rather blocking the attempt to enable Test Signing)?

Are there any known workarounds or alternative installation methods for
this specific scenario (signed driver, Secure Boot enabled and locked)?

Any insights or suggestions would be greatly appreciated. I'm happy to
provide further logs or details if needed.

Thank you for your time and expertise.

Best regards,
F.

[Com0com-user] Problem with Null-modem emulator software

[khashayar k. <kh....@gm...>]

<html style="direction: ltr;">
  <head>

    <meta http-equiv="content-type" content="text/html; charset=UTF-8">
    <style type="text/css">body p { margin-bottom: 0cm; margin-top: 0pt; } </style>
  </head>
  <body bidimailui-charset-is-forced="true" style="direction: ltr;">
    <p>Dear Sir/Madam,</p>
    <p><br>
    </p>
    <p>Hope you are doing well in Corona virus pandemic.</p>
    <p>I faced with a strange bug in your Null-modem emulator software
      today, I have been using this software since last year and it was
      OK. but today it did not work anymore.</p>
    <p>I tried to change the date of my laptop to 11th July and suddenly
      I realized that the software working again.</p>
    <p>Have you ever received this feedback before? do you have any
      solution for this bug?</p>
    <p><br>
    </p>
    <p>I am looking forward to your reply.</p>
    Thank You in advance
  </body>
</html>

[Com0com-user] com0com qemu, error when using serial option

[john d. <joh...@ma...>]

Hi,

I have installed the latest version of com0com but I get the following
error when using:

.\qemu-system-x86_64.exe
 -hda debian.img -cdrom debian-9.5.0-amd64-netinst.iso -boot d -serial COM25


WARNING: Image format was not specified for 'debian.img' and probing
guessed raw
.
         Automatically detecting the format is dangerous for raw images,
write o
perations on block 0 will be restricted.
         Specify the 'raw' format explicitly to remove the restrictions.
C:\Program Files\qemu\qemu-system-x86_64.exe: -serial COM25: Failed
CreateFile (
2)
C:\Program Files\qemu\qemu-system-x86_64.exe: -serial COM25: could not
connect s
erial device to character backend 'COM25'

I just reinstalled com0com to insure it was properly working.
Any idea on what I should do?

-- 
John Doe

[Com0com-user] Redirecting Only Transmit or Receive

[R0b0t1 <r0...@gm...>]

Hello,

I'm trying to reverse engineer the protocol for a piece of old
equipment. Commands are sent, batched, very quickly, and using the
All:All redirection results in confusing output if hub4com is set up
like a splitter.

Is there a way to just transfer input from one virtual port to the
output of another?

I have made some progress taking one of the ports out of the Y, but
the program keeps resending only the first command.

Cheers,
    R0b0t1

[Com0com-user] Is there a possibility to remove a connected vitual serial port?

[Ervin B. <ebi...@gm...>]

<html><head></head><body><div style="font-family: Verdana;font-size: 12.0px;"><div>Hi com0com experts</div>

<div>&nbsp;</div>

<div>In a testcase i&nbsp;want to remove a connected virtual serial port, to see if my software detect the loss of a virtual serial port (if a&nbsp;usb-serial-converter is unpluged the software detect the loss of the interface and throws a error message to inform the user). When testing it with com0com&nbsp;i get the Message &quot;C&#39;ant stop device root&#92;.... Close application that use this device an Try Again Or Continue and then reboot system&quot;. If i klick on continue, the unconnected port will be correctly removed but the&nbsp;&nbsp;connected port still is available.</div>

<div>&nbsp;</div>

<div>Is there a possibility to still&nbsp;remove&nbsp;a connected virtual serial port?</div>

<div>&nbsp;</div>

<div>Thanks,<br/>
Ervin</div></div></body></html>

[Com0com-user] Fwd: Welcome to YouTube!

[Melissa S. <2bl...@gm...>]

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Subject: Welcome to YouTube!
To: 2bl...@gm...


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Date: Wed, 13 May 2015 07:54:40 -0700
Message-ID: <
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Subject: Re: Welcome to YouTube!
From: Melissa Serrano <2bl...@gm... <javascript:;>>
To: YouTube <no...@yo... <javascript:;>>
Content-Type: multipart/alternative; boundary=089e0158cb3267e4fa0515f7cac4

On May 13, 2015 7:23 AM, "YouTube" <no...@yo... <javascript:;>>
wrote:
>
> The largest collection of videos ever. Come see what's new.
> Welcome to YouTube
>
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[Com0com-user] (no subject)

[Melissa S. <mse...@gm...>]

[Com0com-user] (no subject)

[Melissa S. <2bl...@gm...>]

[Com0com-user] hub4com help...

[ZP Gu <zp...@tg...>]

Hi com0com/hub4com experts:

I'm trying to use com0com/hub4com (latest released versions) combo to
enable an old Windows app to access a remote serial connection. The 
other end is provisioned via a terminal server.

Got error messages like this from hub4com whenever the Win app trying to
connect:

Error CNCA0(0): BREAK, total RXOVER=0 OVERRUN=0 RXPARITY=0 FRAME=0
 
Could anyone shed some light on this error message? What is this BREAK?
Is the BREAK generated by the app or the other end???

BTW, com2tcp.bat is used with telnet option only, and com0com driver
is loaded without any special configuration.

Appreciate any help!


ZP

[Com0com-user] adding support for non-standard Serial port

[Pete F. <pet...@gm...>]

I would like to use com0com/hub4com with a synchronous serial port
(RS-422 if it matters), which has a custom driver and API/SDK.   I'm
wondering if anyone has done this already, or if anyone can provide
any guidance on how one would go about it.  I have the source tree,
and I see the port-connector/port-serial/port-tcp - I'm guessing I
would clone the port-serial to my own name (port-syncDev) and then
modify it?

Thanks,
Pete

Re: [Com0com-user] Using large numbers of ports

[<vya...@or...>]

Here are the examples from ReadMe.txt to quick install 250 port pairs

v.2.2.2.0:

      > cd /D "%ProgramFiles%\com0com"
      > FOR /L %i IN (0,1,249) DO setupc --no-update install - -
      > setupc update

CVS:

      cd /D "%ProgramFiles%\com0com"
      FOR /L %%i IN (0,1,249) DO setupc --no-update install - -
      setupc install


_________________________________________________________________________________________________________________________

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[Com0com-user] Using large numbers of ports

[Steve U. <cop...@gm...>]

Hi,

I have used com0com to connect a couple of ports together and it works 
OK for this. Now I am wondering what happens if I use a large number of 
ports. I know com0com is used for t38modem on Windows machines, so I 
assume people do set up hundreds of com0com ports for some applications. 
How good is the performance? How much hassle is it to install and set up 
a lot (e.g. >100) of ports? Even setting up just a couple of ports it 
takes quite a time, as Windows goes through its scan for device drivers 
separately for each port.

Steve

[Com0com-user] Com0Com virtual serial ports

[Ed W. W. <wd...@sb...>]

We used this program a couple of yrs ago and evereything worked great. Now we have returned to it with same computer (XP) and get it to work.
The virtual comports wont enter with the other comports in the systems hardware. We checked the virtuals on a dumb term and they appear as "unknown device". Where am I going wrong? Any suggestions or help will be appreciated. thanks Ed

Re: [Com0com-user] hub4com routing question

[<vya...@or...>]

                 master app <--- CNCA0 ---- CNCB0 ---> | hub4com | <----- COM1 -----> slave app
log app for master app  <--- CNCA1 ---- CNCB1 ---> |________ | <--- CNCB2 ---- CNCA2 ---> log app for slave app



 

hub4com.exe --bi-route=0:1 --route=0:3 --route=1:2 COM1 \\.\CNCB0 \\.\CNCB1 \\.\CNCB2

 

Route data CNCB0(1) --> COM1(0) CNCB1(2)

Route data COM1(0) --> CNCB0(1) CNCB2(3)

Route flow control CNCB0(1) --> COM1(0)

Route flow control COM1(0) --> CNCB0(1)

 

 

________________________________

From: Raúl Contreras [mailto:rco...@li...] 
Sent: Thursday, October 27, 2011 5:01 PM
To: com0com support
Subject: [Com0com-user] hub4com routing question

 

Hi there,
 
I have to set something like this:
                                                                            _________
                 master app <--- CNCA0 ---- CNCA1 ---> | hub4com | <----- COM1 -----> slave app
log app for master app  <--- CNCB0 ---- CNCB1 ---> |________ | <--- CNCC1 ---- CNCC0 ---> log app for slave app
 
Could anybody help me with route settings?
tnks a lot!
RC.-


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Tout message electronique est susceptible d alteration.
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IMPORTANT.This e-mail message and any attachments are strictly confidential and may be protected by law. This message is
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If you have received this message in error, or are not the named recipient(s), please immediately notify the sender and delete this e-mail message.
Any unauthorized view, usage or disclosure ofthis message is prohibited.
Since e-mail messages may not be reliable, France Telecom Group shall not be liable for any message if modified, changed or falsified.
Additionally the recipient should ensure they are actually virus free.
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Re: [Com0com-user] Rx- Tx separation of a real com port

[<vya...@or...>]

hub4com.exe --route=0:1 --route=2:0 COM1 \\.\CNCA0 \\.\CNCA1

Route data COM1(0) --> CNCA0(1)
Route data CNCA1(2) --> COM1(0)
No route for flow control


-----Original Message-----
I want to use com0com and hub4com for this:
I have a gps receiver connected to com1 (a real com port).
A software send via Com1 a differential correction stream to the tx line
of com1. Another software need to read from the rx line of the same port
Com1 for reading the nmea sentences.
I think to do in this mode:
                    |-<>----com1
hub4com   |-->>----cnca0----cncb0---com5 ---NMEA reading software
                    |--<<----cnca1----cncb1---com6 ---DGPS stream
software

whati is the route and the no flow control setting I need to set in
hub4com?
Thnk.
Carlo Piga.

********************************************************************************
IMPORTANT.Les informations contenues dans ce message electronique y compris les fichiers attaches sont strictement confidentielles
et peuvent etre protegees par la loi.
Ce message electronique est destine exclusivement au(x) destinataire(s) mentionne(s) ci-dessus.
Si vous avez recu ce message par erreur ou s il ne vous est pas destine, veuillez immediatement le signaler  a l expediteur et effacer ce message 
et tous les fichiers eventuellement attaches.
Toute lecture, exploitation ou transmission des informations contenues dans ce message est interdite.
Tout message electronique est susceptible d alteration.
A ce titre, le Groupe France Telecom decline toute responsabilite notamment s il a ete altere, deforme ou falsifie.
De meme, il appartient au destinataire de s assurer de l absence de tout virus.

IMPORTANT.This e-mail message and any attachments are strictly confidential and may be protected by law. This message is
intended only for the named recipient(s) above.
If you have received this message in error, or are not the named recipient(s), please immediately notify the sender and delete this e-mail message.
Any unauthorized view, usage or disclosure ofthis message is prohibited.
Since e-mail messages may not be reliable, France Telecom Group shall not be liable for any message if modified, changed or falsified.
Additionally the recipient should ensure they are actually virus free.
********************************************************************************

[Com0com-user] hub4com routing question

[Raúl C. <rco...@li...>]

Hi there,
 
I have to set something like this:
                                                                            _________
                 master app <--- CNCA0 ---- CNCA1 ---> | hub4com | <----- COM1 -----> slave app
log app for master app  <--- CNCB0 ---- CNCB1 ---> |________ | <--- CNCC1 ---- CNCC0 ---> log app for slave app
 
Could anybody help me with route settings?
tnks a lot!
RC.- 		 	   		  

[Com0com-user] Rx- Tx separation of a real com port

[Carlo P. <cp...@te...>]

I want to use com0com and hub4com for this:
I have a gps receiver connected to com1 (a real com port).
A software send via Com1 a differential correction stream to the tx line 
of com1. Another software need to read from the rx line of the same port 
Com1 for reading the nmea sentences.
I think to do in this mode:
                    |-<>----com1
hub4com   |-->>----cnca0----cncb0---com5 ---NMEA reading software
                    |--<<----cnca1----cncb1---com6 ---DGPS stream software

whati is the route and the no flow control setting I need to set in 
hub4com?
Thnk.
Carlo Piga.

[Com0com-user] Hyperterminal in Win 7?

[Abhishek S. <abh...@gm...>]

Hi,
      I installed the latest(2.2.0) version of Null modem emulator for
Windows 7. Since windows 7 doesn't have hyperterminal how can I test if I
have installed it right or it if it works?Thanks

Abhishek Sharma

Re: [Com0com-user] hub4com routing

[<vya...@or...>]

If you have something like this:

 

  app1<--->CNCA0---CNCB0<--->app2

 

and you'd like something like this:

 

  app1<--->CNCA0---CNCB0---hub4com---CNCB1---CNCA1<--->app2

                                 \

                                  ---CNCB2---CNCA2---->app3

 

You can try:

 

  hub4com \\.\CNCB0 \\.\CNCB1 \\.\CNCB1

 


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[Com0com-user] hub4com routing

[Raúl C. <rco...@li...>]

Hi there,

I need some help to solve routing stuff using hub4com. 
I have two applications talking beetwen them over a virtual port pair
 (CNCA0 and CNCB0) created with com0com, and I need to redirect Tx from
 CNCA0 and Rx from CNCB0 to a third virtual port (CNCA1). If this is
 possible, how can I configure it? Or, is there another possible
 configuration of hub4com to listen on CNCA1 the traffic beetwen CNCA0 and CNCB0? Thanks a lot!

R. Contreras.-

 		 	   		  

[Com0com-user] COM port addresses?

[Tom W. <tom...@gm...>]

Hello,

My MS-DOS program works fine talking to com0com on COM2.  But it
supports COM1-8.  I would like to run up to 8 copies of my program all
at once, each talking to a different com0com port.  But I tried to use
COM8, and my program doesn't see the port.  What addresses are COM5-8
on?

Thanks,

Tom

Re: [Com0com-user] HUB for COM ports for ARM CPU

[<pe...@tp...>]

> Not to sure what your after maybe you can send out an e-mail clarifying
> what you are trying to do.  It sounds like you want to create virtual com
> ports through a network.  Or am I totally off?
Hi Michael

I am working on Acer n310 
(CPU Samsung S3C2440, Windows Mobile 5.0 for pocket PC)

I would like to provide data from the GPS serial port to the
1)TomTom software
2)Python application (data logging which TomTom does not offer)
Because of that I hope HUB for COM ports could help...

I hope now it is cleaner what I am looking for..


> 
> On 5/17/07, pe...@tp... <pe...@tp...> wrote:
> >
> >
> > Hi,
> > is there any chance to get "HUB for COM ports" compilation for ARM
> > CPU (Windows Mobile)? Or some sugestions how to compile it from sources?
> >
> > Regards
> >
> > Petr Jakes

[Com0com-user] HUB for COM ports for ARM CPU

[<pe...@tp...>]

Hi,
is there any chance to get "HUB for COM ports" compilation for ARM CPU (Windows
Mobile)? Or some sugestions how to compile it from sources?

Regards

Petr Jakes