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Subject: SAP logon with no credentials does not prompt for password
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Instead of the expected behavior wherein attempting to initiate a GSS context causes a popup 
prompting the user to get kerberos tickets, we get an error message:

GSS-API(maj): Unspecified GSS failure.  Minor code may provi
GSS-API(min): Unknown code 0
Couldn't inquire DEFAULT INITIATING credentials

[...]
Return Code  -4
System Call gss_inquire_cred
counter 1


This seems to be present both in my proto-4.1 builds and in 4.0.1