I meant asking IT what they did that may cause this behavior. It is obviously related to the version upgrades and difficult for us to figure out when we don't know the steps taken by IT.
Already asked this: Office 365 is deployed by Microsoft and IT means, we have an absolutely default deployment, without any customization. No chance to work... and we need a second licence, while the first is no longer working
Can we do a Teamviewer session tomorrow or later this week? I can try and reinstall Seotools on your computer and see if I can find the issue.
Please contact me at firstname.lastname@example.org about this and also write your license email.
Wow, a big step further! I realized, that the problem exists only with HTTPS-URLs. With HTTP everything is working like expected.
Maybe this would help to debug things: https://mehdi.me/a-tale-of-debugging-the-linkedin-api-net-and-http-protocol-violations/
That is good news Can you ask IT to temporarily turn off any firewalls or other type of security for testing purposes?
No Firewall is the holy cow here...
After STFE update 8.0.86 is the trouble gone. Office updates are stopped, so i hope it works in the future like expected. The cause of the problem is still unknown...
8.0.90. Nothing works again, with the same error: "The server committed a protocol violation. Section=ResponseHeader Detail=CR must be followed by LF".Tried some machines in different networks, Excel 16x365 and Excel 2010. It is not funny, guys, seriously!
The only difference to previous cases is, that the error appears now not in the popup, as previously, but appears in every table cell (previously it was #VALUE in cells).
Can you contact me at email@example.com and I'll send you the latest build which has various improvements to the installer related to Excel permissions.
Thank you, it works again
STFE 8.1.25: stopped working with the same error - no Office or STFE updates, but the latest Windows updates...
Can you try and uninstall Seotools and install again? I recommend saving a copy of the seotools.config.xml file to keep your settings.