Slow Response
- From: "Matthew T. Scher" <matt@xxxxxxxxx>
- Date: Mon, 30 Jul 2007 10:41:11 -0400
We have a case where our web service client is experiencing very slow
response to web service calls. Calls take 15-30 seconds to complete.
Analyzing the logs it appears that the call is not reaching the server until
the very end of this timeframe. The server processes the message and
responds very quickly (sub second). The return message is received and
processed by the client very quickly as well.
What we cannot determine is what is happening during prior to the traffic
arriving at the server. The CPU on the client is virtually idle during that
time perhaps indicating it is waiting on some resource to proceed.
We are using...
WSE 3.0
WinForms client
UsernameForCertificate assertion.
The problem does appear to be related to the UsernameForCertificate
assertion. If we do not use that, the message appears on the server
immediately. It is obviously rejected for security purposes but the actual
receipt is very quick.
A google found this
http://www.topxml.com/Webservices-Enhancements/rn-236416_Slow-Response-WSE-3.0.aspx.
This person had what appears to be a similar problem which they attributed
to aberrant LDAP/SPNEGO traffic which was eliminated by removing and
re-adding the client from/to their domain. We have yet to be able to try
this same technique.
This problem only occurs on two machine at one of our customers. It has
never been seen anywhere else. Other machines located on the same segment
with similar configurations do not experience the problem.
Has anyone seen a similar problem? Can anyone shed any light on the above
link and explain what this person saw?
Matt
.
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