TFS & Visual Studio ALM – by Neno Loje

(formerly Team System, VSTS)

Be aware: don’t use underscores in server names

January 11th, 2009 · No Comments · Team System Web Access (TWA), TFS Administration, TFS Installation and Configuration, Troubleshooting TFS

An underscore ("_") is not a supported character for a server name according to the RFC standards and therefore Windows will warn you when trying to use it as part of a DNS name.


ASP.NET applications that use session state, like Team System Web Access, will work when invoked using the IP ( but will fail after some crazy redirecting with a DNS error when using the server name (http://my_tfs:8090/).


You can add a DNS alias and avoid using underscores in server names in the future.


(Thanks to Hakan Eskici from Microsoft for pointing this out.)

Update: Hakan now blogged about this: Strange TSWA connection issue if the server name contains an underscore character.

Update #2: Microsoft published KB article 968549 about this.


No Comments so far ↓

There are no comments yet...Kick things off by filling out the form below.

Leave a Comment