Re: [webmin-l] System and Server Status - Remote HTTP Service

[Natasha S. <ste...@li...>]

> > > > > On 17/Sep/2009 12:20 Natasha Stephan 
> > > > > <ste...@li...> wrote ..
> > > > > > [snip]
> > > > > > I want to set up a monitor to check whether L's webserver 
> > > > > > (not Apache) is up.
> > > > > > I can go to the console on either D or L, open a browser, 
> > > > > > and get to the website on L.  I can SSH in to D or L, open 
> > > > > > links, and get to the website on L.  But when I go into 
> > > > > > System and Server Status and set up a Remote HTTP 
> > > > > > Service monitor, I can only monitor L's website from L. An 
> > > > > > HTTP (HEAD, GET, or POST) request from D does not find 
> > > > > > L's website.
> > > > > > [snip]
> > > > > > I'm thinking there's something different about a HTTP 
> > > > > > request via the browser than an HTTP request via 
> > > > > > Webmin > System and Server Status > Remote HTTP 
> > > > > > Service.  Can anyone confirm or deny?
> > > > On 9/18/2009, Jamie Cameron 
> > > > [mailto:jca...@we...] wrote:
> > > > > One thing to check is if you have any proxy setup in Webmin 
> > > > > on D .. this is set at Webmin -> Webmin Configuration -> 
> > > > > Proxy Servers and Downloads. If so, you may want to turn 
> > > > > this off or configure it to not use a proxy for L.
> > > > > Also, if you go to System and Server Status on D and click on 
> > > > > the HTTP monitor, what error is shown in the "Current 
> > > > > status" field?
> > > On 18/Sep/2009 08:21 Natasha Stephan 
> > > <ste...@li...> wrote ..
> > > > [snip]
> > > > In answer to your question, though, there is no proxying set 
> > > > up on D.  I triple-checked, even though I knew I hadn't entered 
> > > > anything there. I should give you more information than just 
> > > > "the servers are in different locations", though.  D and L are 
> > > > in different VLANs.  Just as Webmin on D can't do an HTTP 
> > > > request and find L's website, Webmin on L can't do an HTTP 
> > > > request and find a website in the same VLAN as D.  Not just a 
> > > > scheduled request, either.  If I set up D to monitor L's 
> > > > website, or L to monitor that other website in D's VLAN, 
> > > > "Current status" shows Down (the red X).  But I can get to 
> > > > everybody's websites with a browser (Firefox or Links) on 
> > > > anybody... which is why I was wondering what was different 
> > > > about an HTTP request from Webmin.  An HTTP request from 
> > > > Webmin will only go through from L to L; as soon as I cross 
> > > > our firewall appliance, I have trouble.
> > > > [snip]
> > > On 9/18/2009, Jamie Cameron [mailto:jca...@we...] wrote:
> > > Ok, so a proxy likely isn't the cause ..
> > > Did you check the System and Server Status module as I mentioned
> > > above?  It should show a more detailed error message about why 
> > > the monitor is failing.
> > > Also, try running the following command on D :
> > > wget -O - http://L/
> > > To see if you can fetch a URL from the command line.
> On 18/Sep/2009 13:39 Natasha Stephan <ste...@li...> 
> wrote ..
> > Thanks.  Sorry for not being clear, I did look at System and 
> > Server Status.  All it says if you click on the monitor, next to 
> > Current Status, is "Down". If you look at the list of monitors, 
> > you see a red X.
> > And wget is a great idea!  Here is its output on D, when trying 
> > to go to L:
> > [root@D 12.5]# wget http://L
> > --15:00:22--  http://L/
> >            => `index.html.1'
> > Resolving L... [L's internal IP]
> > Connecting to L|internalIP|:80... connected.
> > HTTP request sent, awaiting response... 200 OK
> > [snip]
> > Given the "OK", I guess I can indeed fetch a URL from the command 
> > line.  If I run wget -O (and name a path and file), I can get a 
> > copy of the homepage on L.  Doing the same, only going from L 
> > to the website in the same VLAN as D, also works.
On 9/18/2009, Jamie Cameron [mailto:jca...@we...] wrote:
> It's odd that wget works, but Webmin doesn't.
> If you go to the Upload and Download module on D and use it to 
> fetch a URL from L, does that work OK?

Yes.  If I download a known URL on L from Upload and Download, it 
works on D and L just the same.  I tried that same URL in System 
and Server status as a Remote HTTP Service monitor, and it works 
on L but not on D.
I looked at our firewall/routing appliance to see if there were 
any helpful errors, but found nothing... which may simply show 
my ignorance of that device.
Thanks,
Natasha