Also, can you try to connect directly to your tomcat url and check if you get this error. This is to rule out issue due to reverse proxy. It might not be the issue, as it works fine for some users. But just to be sure, just check this as well. --- I tried with direct tomcat URL for connection and its working fine with no errors.
Does the above mean that it works for enterprise and winAD users if you directly go through tomcat url?
Regards,
Atul B