We had a 4.2.c installation working for 3 years with following configuration
Users were accessing via IE browser with SSO but the other protocols (WebDAV, SPP and CMIS) were accepting basic auth.
We are migrating to 5.1.g and we have applied the same configuration. Kerberos SSO is working, but the other protocols are producing a non ending loop of Kerberos challenges:
It seems that this feature has been broken in some point between 4.2.c and 5.1.g