Re: [webmin-l] Strange issues with ICMP monitoring

[Jamie C. <jca...@we...>]

So if you switched to the "Use command" mode, Webmin will just run
a command like :

ping -c 1 -w 5 remote-host

and check it's exit status. You could try creating an "execute commmand"
monitor to do the same thing, and see if that works better?

On 23/Aug/2021 00:47 Joaquim Homrighausen <jo...@we...> wrote ..
> 
> So this is still happening with 1.979. I'm now bumping to 1.980, but not 
> expecting much to change.
> 
> I've switched from Webmin's internal "ping" to using "Use command 
> suitable for Linux or FreeBSD". No change.
> 
> I've moved the "ping monitors" to another host. No change.
> 
> Is there a way to enable some sort of debugging for "System and server 
> status" pings ... ?
> 
> I run a self-written Python script on the same server, that basically 
> does the same type of ping monitoring, and it *never* reports a "down" 
> when Webmin does.
> 
> I'm confused :-)
> 
> 
> -joho
> 
> 
> 
> On 2020-12-08 23:12, Joaquim Homrighausen wrote:
> >
> > Hi there
> >
> > As stated in the post(s), Webmin 1.962 on Ubuntu 20.04.LTS.
> >
> > We do indeed use fail2ban on the servers being "pinged", but the ping 
> > interval is set rather high.
> >
> > The checking server all of a sudden starts reporting monitors as being 
> > down, but they are actually not. If I ssh into that checking server, 
> > and issue ping to the servers reported as being down by Webmin, I get 
> > a response. Every time.
> >
> > If I reboot the checking server, which takes about 10-15 seconds, 
> > everything goes back to normal.
> >
> > It sounds/looks to me like a "build-up" issue, but I've only ever seen 
> > this on that particular server. It happened with Ubuntu 18.04.LTS, and 
> > it's happening with Ubuntu 20.04.1.LTS.
> >
> > It happens frequently, but not every day.
> >
> > The checking server is not logging in to the remote servers, it's 
> > simply sending ICMP/pings.
> >
> >
> > -joho
> >
> >
> > On 2020-12-08 23:04, Eric Tykwinski wrote:
> >> Sorry new to the list, but what are you running?
> >> VirtualMin, Webmin, Cloudmin?
> >>
> >> My first guess would be a fail2ban issue as that is a popular 
> >> dictionary attack mitigation method, so a cluster of webmin servers 
> >> with an incorrect password on one would cause this.
> 
> 
> 
> -
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