Cannot display PDF in interactive container when hosted

[human]

I have a global container field that I want to display a PDF in interactive mode, so that one can scroll through a multi-page document. Works when the file is local, but gives an error when hosted on FM Server 19 on Mac 10.14, with the client being FM 19.2.1 on OS 10.14 or 10.15. Works if I change it to non-interactive. Googling around, the answer is supposed to be that the server needs a valid SSL cert, needs port 443 open, and needs web publishing running. But all these conditions have been met, doesn't help. The error is always something lime this:

Proxy

GET

/Proxy/98B041CA3BED0A7582EDA599467B187A.pdf?urlid=98B041CA3BED0A7582EDA599467B187A

1631

-H "Upgrade-Insecure-Requests: 1" -H "Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8" -H "User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/605.1.15 (KHTML, like Gecko) Safari/531.9" -H "Accept-Language: en-us" -H "Accept-Encoding: gzip, deflate" -H "Connection: keep-alive" -H "X-FMS-Session-Key: 063EE5498D1683F7E3435E33889E1B8073D01C459C426AAAEBF0BED1437D99EF"

[human]

Claris says this is a known issue. Seems like it's fixed in FMP 19.2.1, but I haven't tested with older server versions

[carolq]

I am having same problem since administrator replaced FM Server with new MacMini M1 Catalina. 
(external open storage for pdf's)

All Mac and Windows FM Pro clients can see pdf's for about a month, then not.
I restarted. Then it worked.

Then admin upgraded to BigSur. Broke pdf's again. I got a new SSL cert issued/installed. Worked for a few weeks,...then today, not working (mac and windows clients). Just updated Windows computer to 19.2.2...didn't help at all. 

Customer is getting very angry. Not sure what to do. I am not a network admin. I got message "optimizing" when I connect to the server. Also see Code42 wanting to backup every 10 minutes. I have emailed administrator to make sure these processes aren't interfering with FM Server.

 

 

 

[carolq]

I asked network administrator to restart SonicWall. PDF's are now displaying. No more GET proxy error 1631.