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SSRS reports (via HTTP) are very slow on site, OK externally. How do I identify what is "blocking" them using Wireshark?

asked 2017-11-15 14:48:42 +0000

A customer is complaining of very slow Reports (SSRS via HTTP) on site - often 60 seconds for one report. However, the same report runs in a second or two when external to the site. The site-to-centralised server speed connections are fine, have tested that and are faster than my home-to-server speeds which do not have a performance issue.

How can I use wireshark to identify what is slowing down the request? I know the IP address of both ends and that it uses HTTP. I am new to Wireshark, I have no idea how to enter these as parameters / filters, capture some data requests and then analyse.

Thanks in advance.


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answered 2017-11-15 18:04:28 +0000

Jaap gravatar image

First of all be aware you may be embarking on a long journey here. It depends on your access to the network and the intermediate nodes, the network appliances and how well you understand the protocols. You may get some advice here, but won't be taken by the hand for a full network analysis.

That being said, have a look at the various video's and other learning stuff presented at the Wireshark Website, eg. the Users Guide or the various presentations of SharkFest.

In this particular instance you would be looking specifically hard at the TCP layer, as in, what is happening in connection setup and further down the line with these connections. What is to be learned from that, especially when compared to (known good) external-to-site communication. So you'll have to capture that too. I would expect the traffic to take a different route through the network, so what happens to these TCP streams, in what regard do they differ? So taking captures at various points in the network (through span ports probably) should give you the data to interpret.

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Asked: 2017-11-15 14:48:42 +0000

Seen: 1,654 times

Last updated: Nov 15 '17