Something in 2.61 breaks Office 365

[allenlook]

Installed 26.1 and all seemed fine.  Yesterday I was having a lot of trouble with M365, specifically PowerPoint and Excel files that would save locally but generated a lot of "Upload Failed" messages, and intermittent "SSL library load failed" messages in Excel.

I reverted to 25.x and everything was working OK again.  I tried disabling Maltrail and its blocklists, turning off the Unbound DNS blocklist, and looking for rules that might be causing trouble.

Using the M365 Connectivity Test website everything was working OK under 25.x, but it would generate a lot of errors to domains like microsoft.com, and .microsoft using 26.1.

Are there any other reports of this, or does anything stick out as being a possible culprit?

[nicholaswkc]

SSL Certificate may cause this errors.