Server Encountered An Error - AWS Workspaces Web

This is due to some port issues, check the NACL and Security groups. I had such issues in past and not able to find the anything from the documentation. Try and check the network from the user end also.

Do let me know once it will be resolved.

Can you elaborate on what you mean by port issues? I can't see how it can be NACL/Security Groups as the user is part of the same group as others who aren't having issues