Error after upgrading to onlyoffice-documentserver 6.3.0-111

Hey there,

after upgrading onlyoffice-documentserver from 6.2.2-21 to 6.3.0-111, opening documents in Nextcloud fails with an error. The documentserver docservice log shows the following:

[2021-05-21T10:47:12.032] [ERROR] nodeJS - changesError: docId = 3758304259 Error: SecurityError: The operation is insecure. Script: Line: 1291:0 userAgent: Mozilla/5.0 (X11; Linux x86_64; rv:88.0) Gecko/20100101 Firefox/88.0 platform: Linux x86_64 isLoadFullApi: true isDocumentLoadComplete: false StackTrace: MJ@

I also upgraded the onlyoffice Nextcloud app (to 7.0.2) recently, maybe that’s related as well.

Did anybody else spot a similar issue? Any idea how to resolve it?

Ok, seems like this is related to the Firefox tracking protection. After disabling it, opening documents from Nextcloud works again.

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For the record, if anybody stumbles across the same problem: The problem was that OnlyOffice ran on a different domain than Netcloud ( and After changing this (using for Nextcloud and for OnlyOffice), the Firefox tracking protection no longer blocks the OnlyOffice scripts as third party scripts.

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