Server Randomly Stops Accepting HTTP Requests - No Logs
Posted on 2009-04-20
We have a server that about once a week, stops responding to HTTP requests.
When we telnet to the IP on port 80, the second you hit any key on the keyboard it disconnects. In IE, you just get page cannot be displayed. Even when trying locally on the server itself, with public & 127.0.0.1. I am, however, able to telnet to port 25 and connect to the SMTP server while this is occuring.
IIS Reset does nothing. There is nothing in any event viewer log that indicates any problems. The request obviously isn't logged in IIS logs either.
The only way to restore HTTP access is by rebooting.
This is a Windows Server 2003 Enterprise Edition server with SP2/R2. This server is part of an Active/Passive SQL Failover Cluster.
How can we troubleshoot why the server stops responding to HTTP requests?
How can we troubleshoot this when it is not happening? (just rebooted to fix)
I've put network monitor on the server but it doesn't appear to register any
connections on the IP, netstat doesn't show anything either.
I've just now put WireShark on monitoring all TCP/UDP Port 80 connections, but I suspect that when this happens it simply will not show up - then what?
Any insight would be appreciated,