ChannelFactory.CreateChannel and proxy instantiation is slow in WCF

Question

I have a client-server application, in which the client communicates with the server using WCF (WCF is used both in the client and the server). My problem is, that instantiating the auto-generated proxy in the client, in the following way:

 new Service1Client() 

takes constantly 15.xxx seconds. I tried to solve this problem, and came to the following results:

1) Compiling and running the same code on other computers, ends up in the same way (always 15.xxx seconds).

2) Instantiating the proxy using ChannelFactory.CreateChannel< IService1 >() doesn't help (it gives the same result).

My guess, is that whenever the channel factory creates a channel, it tries to do something with a 15 seconds timeout, and when it fails, it continues with creation.

By the way, I use .Net 3.5 without SP1, and cannot upgrade to SP1 :(

Thanks ahead

Answer 1

I've seen this before, where the time was being taken in looking for a proxy server. Check your WinINET (Internet Explorer) proxy settings.

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My specific reason for thinking "proxy server" is that it takes 15s. 15s sounds like a nice round number for a network timeout.

Answer 2

What is the configuration like? I wonder if it is trying to do some kind of connect (security, etc) to the server...? You might also try a network trace (wireshark etc) during this period.

Answer 3

Do you have expensive Service Behaviors configured that could be eating up resources? These execute when the host starts up...

Answer 4

Even though it is already outdated, it may be useful for somebody else searching for the same. Problem could be with DNS resolution problem, that might be solved in SP1. So you can check if it happens only when you use host name or also with specified IP address.