This issue is caused by the mismatch between the SQL user 'eautodata' and the login password stored for this account. When the user account is no longer able to access the SI database, we receive an error everytime SI Communicator attempts to log in.
To correct this issue we must delete the existing eautodata user, and then recreate it using the hard-coded password stored for that account. This can be done by executing the attached SQL script to this ticket. For assistance running this script, please contact support directly and reference this error.