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I'm using a QBX appliance, which is just a microATX desktop system with FreePBX connecting to asterisk and some other slapped together stuff running on CentOS 5.4. It's horribly out of date (which I plan to correct really soon).

It has been very reliable until recently. Since Monday morning or so the device has been acting randomly. Sometimes it will just drop all network traffic (web gui/ssh/SIP) and not re-establish itself, but sometimes it will re-establish itself. Other times it will just cut a user off after just over 2 minutes of calling (unsure if coincidental). Other times it will just stop responding to SSH but calls will work.

I suspect the network stack, however nothing in it has changed in weeks. The only thing that has changed was about two weeks ago when I added an extension for a softphone to use. The softphone was used last week before this even started happening, so I don't suspect that. Otherwise nothing has changed, no updates, and I'm the only one working on it.

I can't find anything in the logs just yet, but can someone possibly throw some ideas at me please?

Asterisk 1.4.30, i686

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Is it possible the hardware is failing? It can be network card/port or even the hard drive. –  John Siu May 2 '13 at 19:17
    
It is possible but I am unsure how to conclusively determine this just yet. It's using an Intel onboard NIC and expansion NIC (both Intel. Not sure how to determine this is the fault if it is. –  BloodyIron May 2 '13 at 19:31
    
Can you verify that when the issue occur, that box actually lost tcp/ip connection completely(eg. can't ping/ssh. etc)? If it is the case, very likely it is hardware. Also check /var/log/messages for system error. –  John Siu May 2 '13 at 19:37
    
I have looked at messages multiple times, it doesn't seem to have anything relevant so far. Unfortunately some of the times it's happened I was away. This is pretty challenging to diagnose :/ –  BloodyIron May 2 '13 at 19:59
    
Setup something like nagios or collectd for ping monitoring. –  John Siu May 2 '13 at 20:05
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