On successful connections to the cache server, the following return codes and strings can be returned:
101, "Client certificate does not match any assigned users."
102, "This user is disabled."
103, "This system/account is not assigned to this PAR Cache."
104, "This system/account is disabled."
105, "No permission exists for this account/user/host combination."
106, "This client host is disabled."
There can also be errors associated with network issues, SSL negotiation, etc. Those would be standard error codes that could be encountered for any secure web service call.