You may want to consider using something like SNMP.
Does it work with something like Postman? I'd probably look at it with something like JOBEXAM to see what line of code it is executing. Maybe there is something specific browser based that it is passing that you have to define explicitly in the HTTP request. Also suggest to try in a later Cache or IRIS version.
If you need help debugging feel free to open a WRC case with us.
-Len
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There is an article posted on how to troubleshoot this type of error that may be helpful.
https://community.intersystems.com/post/debugging-%E2%80%9Cserver-availa...