"Cannot open database requested in login 'TsHelpDesk'" suggests that
either the database doesn't exist, or the login you're using has no
access to it. You say you're connecting to a "remote" database, but the
connection string seems to be local - could that be the issue?

If not, I would check that the login you're using has been granted
access to the database with sp_grantdbaccess.

Simon