Analysing log files I've noticed that ~1% of service calls ended with TimeoutException on the Silverlight client side. The services (wcf) are quite simple and do not perform long computations. According the log all calls to the services are always processed in less that 1 sec (even when TimeoutException is occurred on the client!), so it is not server timeout.

So what is wrong? Can it be configuration or network problem? How can I avoid it? What additional logging information can be helpful for localizing this issue?

The only one workaround I've thought up is to retry service calls after timeout.

I will appreciate any help on this issue!

Update: On startup the application performs 17 service calls and 12 of them simultaneously (may it be cause of failure?).

Update: WCF log has not contained useful information about this issue. It seems some service calls do not reach the server side.