#WIRESHARK FILTER HTTP STATUS CODE MANUAL#
Capture filters are a lot more manual to configure, and they are more time-consuming to tweak and get working correctly.With display filters you can easily just right-click on a relevant node you want to filter on, and "Apply as filter".This is pretty clever stuff, but I figured I could extend this filter to look for 503 responses.Ĭapture filters are more difficult than display filters in Wireshark. "tcp & 0xf0) > 2" figures out the TCP header length. This looks for the bytes 'G', 'E', 'T', and ' ' (hex values 47, 45, 54, and 20) just after the TCP header. I remembered a recent course I studied which pointed to some capture filtering that could be done to find HTTP GET requests. We wanted to come up with a special Wireshark filter, to capture and record only the 503 errors over a longer period of time, so that we could do more analysis and fix the problem. Just leaving Wireshark running and capturing all requests and responses for 24 hours+ was not a good option, because of the additional load, and data logged. We really needed to log the 503 errors, so that we could continue to troubleshoot and perform some configuration optimization. It was difficult for us to find any reason for these errors, and unfortunately, IIS does not log 503 errors (as far as we could see) so we could not tell how many were occurring, when they were occurring, or if there were any other associated patterns. These systems were handling over a million requests per day between the two systems, and intermittently responding with 503 errors for a small percentage of requests. Recently I was helping to troubleshoot some HTTP 503 error codes which were happening on an couple of IIS servers. Wireshark is an excellent tool, and capture filters can be quite daunting, but they can also be very powerful and useful. Using Wireshark capture filters to track down specific HTTP error codes on a web server.
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