Re: [webmin-l] Issue with backing up *via ssh* from a Linux system to a NetBSD system using the "Filesystem Backup" module

[Christopher P. <cj...@ex...>]

Le 2022-10-15 18:49, Jamie Cameron a écrit :
> On 15/Oct/2022 06:30 Christopher Pinon <cj...@ex...> wrote ..
>> Hi,
>> 
>> I've been using Webmin for a few years and am currently using v. 2.000 
>> .
>> 
>> I've noticed a significant issue with backing up *via ssh* from a 
>> Linux
>> system to a NetBSD system using the "Filesystem Backup" module. In 
>> fact,
>> this is an issue that I've always experienced with Webmin, but I 
>> thought
>> that I would finally ask about it. :-)
>> 
>> First of all, backing up *via ftp* from Linux to NetBSD works fine
>> (whether by dump or by tar), and this is what I've been doing.
>> 
>> However, backing up *via ssh* from Linux to NetBSD doesn't work for 
>> some
>> reason. If I start a backup from Linux to NetBSD, the process begins 
>> and
>> takes a long time and finally gives up (or after a long time, I give 
>> up
>> and terminate the process). There's never ever any trace of the dump 
>> or
>> tar file on the NetBSD system.
>> 
>> (As a sanity check, backing up via ssh from Linux to Linux *does* work
>> for me.)
>> 
>> Naturally, ssh/sftp work fine on the NetBSD system -- after all, it's
>> (standard) OpenSSH.
>> 
>> Webmin doesn't display any error message, as far as I can tell: the
>> backup process simply doesn't succeed after a long while. None of the
>> files miniserv.error , miniserv.log , or webmin.log seems to indicate
>> that anything went wrong, as far as I can tell.
>> 
>> I wanted to ask: is this a known issue? Where could I look for the
>> source of the error?
>> 
>> I'd be grateful for any advice.
> 
> Hi Christopher,
> 
> Are you using a password to authentication via SSH to the remote 
> system,
> or a private key? Also, can you SSH with the same credentials from the
> command line on your Webmin system?
> 
>  - Jamie

Hi Jamie,

I'm using a password to authenticate via ssh on the remote (NetBSD) 
system. (All of my backup tests via ssh with Webmin from Linux to NetBSD 
and from Linux to Linux have used a password to authenticate.)

On the command line of the Linux system (where Webmin is installed), I 
can use ssh/sftp/scp to reach my account on the remote NetBSD system. In 
fact, I've just tried all three of these commands and they work!

Even so, any attempt to use the "Filesystem Backup" module of Webmin on 
the Linux system to back up via ssh a (small) directory to the NetBSD 
system fails. Basically, the process takes many-many minutes -- it seems 
to hang -- before it finally gives up (or I kill it), with absolutely no 
result.

In contrast, choosing to use ftp in the module works fine.

I've experienced this issue since I began to use Webmin, which was 
around four years ago.

Thanks,
C.