The authentication scheme ' NTLM' is not supported and other issues migrating from .asmx to wcf

I just switched my .asmx web service to WCF (both in .NET 3.5), and now I am getting

The authentication scheme ' NTLM' is not supported. 

The only thing I've seen on google is where some w3svc/NTAuthenticationProviders setting had NTML instead of NTLM. I don't have that issue.


Okay - here is a summary of some annoying WCF issues that I encountered while migrating hopefully it helps someone.

Issue 1 - "This collection already contains an address with scheme http. There can be at most one address per scheme in this collection."

This is caused, I guess, by my web server having multiple web sites with multiple host headers. Solution found here: WCF Error: This collection already contains an address with scheme http.

I just added a baseAddressPrefixFilter:

        <add prefix="" />

Issue 2: I got The authentication scheme ' NTLM' is not supported. error. I struggled with that for a while but eventually a reboot made that one go away (although I also did this (

# change directory to c:\inetpub\admin scripts first
cscript adsutil.vbs set w3svc/NTAuthenticationProviders "Negotiate,NTLM"

There was a space after the first comma in my config, no idea if that was causing an issue.

Issue 3: After a reboot, I got fun .404 errors.

My first guess at this was that wcf was not set up to be hosted on my server so I ran: (

serviceModelReg.exe -i

But the real source of the 404 was caused by me trying to go to http://yoururl/somewhere.svc instead of (i.e. my baseAddressPrefixFilter was causing my 404).

Hope this helps!

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