On Fri, Jan 25, 2013 at 8:50 AM, Jeremiah Rumball <jdrumb...@gmail.com> wrote: > Hi all, > > I've come across a rather odd issue that I'd like your opinions on. We have > a user at a ~10 user company who complains of slowness in their primary > business app. He complains about every other month. The app is installed > locally and talks out over the web to servers in a data center. The other 9 > employees all use the same app talking to the same servers. They have a > dedicated WAN pipe (T1 I believe) in place that only routes traffic for > their app. All other web traffic goes over their DSL connection. When > contacting support for the app they can see a high percentage of packet > re-transmission coming from the one user's PC; all of the other PCs have > little to no re-transmissions. After a week or two the issue eventually goes > away; as in, the user stops complaining and the support team for the app no > longer sees the packet re-transmissions. Here is some of the troubleshooting > we have done locally: > > > Continuous ping to his PC from another PC on the network (no dropped packets > and an average reply time of <1ms) > Swapped out his patch cable going from the PC to the wall jack. > Moved his patch cable in the server room to another port on their switch. > Connected another PC to his wall jack and ran the app (no packet > re-transmissions). > New NIC in his PC (current NIC is integrated, the new was a 1gb PCI-E). > Ran traceroute and verified the path taken to the server IP is the same on > all computers. > Perfmon shows that his network utilization never goes above 5% even when > he's having the performance issue. > > > We have contacted the ISP that provides the pipe for the application and > asked them to check for errors as well as bandwidth utilization. They came > back with no errors and less than 50% bandwidth utilization (upload and > download) at any given time. Our network guy has logging running on the > client's router but has yet to come up with anything conclusive. One other > thing to mention; every once in awhile another user or two will have a > similar issue. However, it normally only lasts for an hour or so and isn't > as severe. > > If anyone can think of something else we might try troubleshooting I'd love > to hear it. > > Thanks, > > Jeremiah
I'd continue with monitoring his workstation for memory/processor problems, after a good scan for malware. Set up a local Windows box running perfmon (so that he doesn't have to have it running on his workstation) with a trace, and see if anything falls out. Kurt ~ Finally, powerful endpoint security that ISN'T a resource hog! ~ ~ <http://www.sunbeltsoftware.com/Business/VIPRE-Enterprise/> ~ --- To manage subscriptions click here: http://lyris.sunbelt-software.com/read/my_forums/ or send an email to listmana...@lyris.sunbeltsoftware.com with the body: unsubscribe ntsysadmin
