Error 55501 - Failed to Connect to the Remote Server Application by jcallicott
I happened upon a bit of info that I hadn't seen documented, so I wanted to pass it along.
I had several users getting Error 55501, and were unable to open or otherwise download files. I couldnt figure out why initially, and saw the post
I realized he project in question was in a new storage area. Even stranger, only external users were affected - it worked in the local office (the same office where the Integration Server is located).
The fix in PW Administrator, when looking at the properties on the storage areas, the "Computer Name or IP address:" field, the Integration server name was entered as: "servername". It did not have the fully qualified domain name (FQDN). I thus opted to re-name it using the FQDN thus: "servername.company.com" and not just "servername". That turned the trick and eliminated Error 55501 for external users.
Note: the fix above will change the storage area settings for all users, even those not connecting via gateway server, so verify it still works internally.
Another option is to add entries in the dmskrnl.cfg on the gateway server using the short name (exactly as its configured in the storage area settings, server field)