The Guacamole manual contains a section on proxying, if you've not seen
it already it does contain some useful information:
https://guacamole.apache.org/doc/gug/reverse-proxy.html
Also this discussion and Nick's response may give a pointer or two:
https://lists.apache.org/list?user@guacamole.apache.org:2023-11:ERROR_PAGE_UNAVAILABLE
If you need to come back to us it would be useful to include information
such as the distribution you're using, how you installed Guacamole (and
nginx) and the various versions involved etc. Some log data could also
be useful.
One other thing, it's always a good idea to clear your browser cache and
refresh between config changes.
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