Publishing BizTalk Orchestration as WCF service

Some issue I encountered when publishing BizTalk Orchestration as WCF service.

After the wizard finished, I tried to browse to the svc file and got the following error:

Type 'System.ServiceModel.Activation.HttpHandler' cannot be instantiated under a partially trusted security policy (AllowPartiallyTrustedCallersAttribute is not present on the target assembly).

It seems that WCF can't initiate itself with less then full trust policy. To solve this edit the service web.config under <system.web> section with the following entry:

<trust level="Full">

By this you'll grand the service full trust security policy.

Another error is: Receive location for address ".svc" not found. (The BizTalk receive location may be disabled.)

This one means that the target Receive Location in BizTalk administration is not existing (you didn't check the option in the wizard) or it's not enabled.