What is failing is a call to the SAS Content Server, with a HTTP 501 response to a WebDAV specific call called "PROPFIND". You may wish to check the logs for SASServer1, and if you have a proxy or firewall in front of your middle tier ensure it is not blocking WebDAV calls.
-- Greg Wootton | Principal Systems Technical Support Engineer
The SAS Users Group for Administrators (SUGA) is open to all SAS administrators and architects who install, update, manage or maintain a SAS deployment.