I have a WCF service that had been using NTLM authentication, but needed to recently switch it to digest authentication. The service is running on both an XP Professional machine, as well as a 2003 Server machine, both experiencing the same issues.
To set-up the digest authentication, I created the following in my web.config servicemodel section:
<binding name="NtlmConnect" maxBufferSize="147483647" maxBufferPoolSize="147483647"
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