Are you getting Office Online Server/Web Apps errors on Chrome or Firefox but not Internet Explorer?
We got LOADs of different errors. Some are shown below.
Your connection is not secure
The website tried to negotiate an inadequate level of security.
WebappURL.domain.com uses security technology that is outdated and vulnerable to attack. An attacker could easily reveal information which you thought to be safe. The website administrator will need to fix the server first before you can visit the site.
Error code: NS_ERROR_NET_INADEQUATE_SECURITY
or
Office Online Server: We couldn’t find the file you wanted. It’s possible the file was renamed, moved or deleted.
We had such a weird issue as we recently installed patches on our Office Online Server and rebuilt the farm as always. Tested in IE and it was working but then we started receiving tickets about no files loading in Chrome or Firefox. Checked the health status of the farm servers, checked the XML link which was working properly, checked the certificates were set on each server and the checked the bindings on the SharePoint servers. Everything was correct and it was running seamlessly on IE. So what could be the problem?
After almost a full day of research, I decided to go ahead and rebuild the farm and re-do the bindings. After setting the certificates in IIS on each OOS server, it was doing the SAME THING! Then I realized I had forgotten to restart the servers. It says in powershell after you set the certificate that you must restart the servers. DOH! Restarting the servers fixed the issue. It turns out that Firefox and Chrome have a setting that detects the proper certificate and it didn’t pass their checks until the server was never restarted after setting the certificates.
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