WCF NetTcp Adapter Issue across servers

I am facing problem in my WCF nettcp adapter. I have a oneway WCF-nettcp receive location and I have exposed the my BizTalk solution as a WCF NetTcp service. I have enabled Anonymous authentication while publishing the Biztalk service. When the client and BizTalk service is on the same machine everything works fine. But when the client is in a different server I get the following warning message on the Biztalk server.

The adapter “WCF-NetTcp” raised an error message. Details “System.IdentityModel.Tokens.SecurityTokenValidationException: The service does not allow you to log on anonymously.

Any help would be highly appreciated.

Thanks.