I regret to inform you that I haven’t seen this particular topic.
Please provide more information about your proxy:
- We have a sample configuration for setting up the proxy.
https://helpcenter.onlyoffice.com/ru/installation/docs-community-proxy.aspx
https://github.com/ONLYOFFICE/document-server-proxy/blob/master/nginx/minimal.conf
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Please check your proxy settings
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Attach the configuration of your proxy. Most likely, the issue lies therein.
If you don’t mind, I will close this topic as we are addressing a single issue.