We had an issue with the traveler webinterface after upgrading to 8.5.3 Upgrade Pack 2.
It is working when accessing one of the traveler servers directly, but not when using the external proxy URL.
During the setup procedure, some changes will be applied to the website configuration document.
But in our case not to all of them (we have different ones for internal and external access).
At the bottom, add “TravelerAdmin” to this field:
“tell http refresh” and it works…