The mystery continues with this error. I've got PMR open with IBM support and they are stumped as well. This is the error I'm getting for Linux MP when I Validate Node for Mount Proxy.
ANS1353E Session Rejected: User ID is incorrect, does not have admin authority, or is not known by the server
I've got this successfully working at another customer for three separate vCenter environments. I'm thinking it may be a connectivity issue, but the above error is pointing to admin authority. As I understand, SP for VE v8.1.6 no longer creates admins when running the configuration wizard, so I'm not sure why it would referencing that. I can make a connection to SP server and I can query vm backups with the Linux mount proxy cli.
Any ideas???