Intermittent access to Web portal although Ping results are positive

5 pts.
Tags:
Network analysis
Network connectivity
Network testing
Ping
Remote office connectivity
I'm puzzled by our network connectivity between our main office and project site. From the project site, ping results to both web servers in the main office have no loss but just could not have access to main office web portals (port 80 and 81). The 'page disconnection' happens very frequently and at irregular hours. I've checked both servers and event log does not reveal any findings. There is no issue of CPU contention too. How can I further troubleshoot in order to have a better insight into the problem? I appreciate your suggestions and postings.

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Try using <a href=”http://www.wireshark.org”>Wireshark</a> to capture traffic between the devices. You can use the tshark command line utility that is included if you wish to capture round-robin type files and then copy off the captures when the event happens. There might be some content in those captures that can tell you what is happening. Another thing to watch is some of the perfmon counters on the web server. Specific perfmon counters could include user connections, w3wp process utilization. You might also look to see if additional website logging can be enabled. Do a search on Microsoft KB articles about debugging IIS issues.

Ping results only say if the NIC is online with an IP address and is listening to ICMP. There is something happening with the webserver as you already know. Try also using the <a href=”http://www.hping.org/”>hping</a> tool to “ping” port 80 and 81. This will also help track down when the service is not available.

Good luck.

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  • Kevin Beaver
    Is there a firewall in the picture that could be doing some sort of content filtering or packet inspection? If so, try to disable any of those features...Also look in the firewall logs to see if anything obvious jumps out.
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