Client-Side CommunicationException while Service works properly

Question

Currently i am facing a problem i do not understand. I have an wcf client that calls a wcf service through several threads at the same time (both on the same machine). Somet

Answer 1

I'd suggest to verify 2 points:

1. Throttling on the server, like

   behavior name="Throttled"
   serviceThrottling
   maxConcurrentCalls="1"
   maxConcurrentSessions="1"
   maxConcurrentInstances="1"
   

2. Not closed WCF sessions - do you close all your sessions (client proxy) after used?
   In my case when I enlarged all timeouts to max, I got situation when after X calls, service became "stuck". When I changed timeouts, I was received exception like yours.

It was several years ago, So i did not remember exactly. Also, I remember I found good article that was described how and why to change Service Instance mode to help this (sessions) issue.