We have a client that has broadband issues. I've narrowed this down to being caused by their server but I just can't figure out what it is that's doing it.
Basically, from any workstation, a constant ping to the outside world will return at about 400 - 500ms. Ping the server and it replies in <1ms.
However, physically unplug the server from the switch and the ping to the outside world immediately falls to around 25ms.
If I get the server to ping itself then I get a <1ms reply.
If I ping the server from a workstation I get a <1ms reply.
If I ping a workstation from the server I get a <1ms reply.
I've been running a Network Traffic Monitor program on a different server (Win 2003 standard) but I'm not seeing massive amounts of traffic from anything. It makes me think it's not a network that's simply flooded with traffic.
I've spent a few hours on site with this today. I've been going through the services list with a fine tooth comb and I stopped anything that I didn't recognise. At one point, the ping rate fell just after stopping a Kaseya agent service. I thought I'd found the problem so I uninstalled the Kaseya agent and rebooted. The high ping rate returned after the reboot and I just find anything that's causing it.
I'm guessing that I ended a process somewhere that made something else crash. I'm not sure what though.
I'm now working on this remotely this evening in the hope that I can resolve it in the next hour or so (bedtime soon!) and they'll have a working system tomorrow.