I have configured SAP CRM WebDAV Repository in KM and able to see them in KM Content. Then I created TREX index for the WebDAV Repository and perform indexing. When I checked the Display Queue Entries in TREX Monitor, I see that all the folders are indexed. However all documents indexing failed with Return message HTTP Status Code 405: Method Not Allowed, Return code 6405 and Document Status: Preparation Failed.
I have also created index for KM Content, and it is able to index both folders and documents from KM Content correctly.