S-ALL-05 Authorisation Failed - Invalid ErrorResponse

[joecrowley-synergy]

Received exception

1 - REJECT EDEV     │ Failure parsing ErrorResponse from 0 chars at /sep2/edev/675: Document is empty, line 1, column 1 (<string>, line 1)     

I believe at first guess that this will be a CACTUS issue, assuming that an error object should be returned when it probably doesn't have to be.