outlook OWA HTTP2_Frame_Error - outlook wont load

[johnpd]

We have Sophos XG with typical filtering grep formula to allow %a-z etc for office.com, or outlook.office.com / outlook.office365.com but since April/May time a number of clients/users on our wired lan get a HTTP2 frame error and OWA won't load. There are no filtering blocks appearing in the Sophos XG logs either.

 

Has anyone had issues with this error recently and if so have you solved it?

 

Sites all running latest firmware.

 

Thanks

John

[ultima170387]

We are having the same issue and also have a Sophos XG. Not got to the bottom of it.

[sluggster66]

Do you use any monitoring software? Maybe Senso?

[RobFuller]

We are seeing this error on Smoothwall but also have Senso! Been working with Smoothwall on it but very intermittent and normally on cloud filter devices. Not effecting staff machine which don't have Senso installed which is interesting. Edited June 27, 2023 by RobFuller

[sluggster66]

We are seeing this error on Smoothwall but also have Senso! Been working with Smoothwall on it but very intermittent and normally on cloud filter devices. Not effecting staff machine which don't have Senso installed which is interesting.

 

This was a SENSO issue for us. We added the following to our SSL bypass list in our senso logging policy.

 

|intunecdnpeasd.azureedge.net|microsoft.com|windows.net|office.com|office365.com|onedrive.com|sharepoint.com|

 

You will see we also have some Intune addressee's in as well, as it broke Intune devices calling in.

 

Hope that helps

 

Simon

[ultima170387]

We do use Senso - I will look into this.

[robintech]

Not sure related but I had an issue with Google Quic where it wouldn't show up in the firewall logs , but would have thought Microsoft have upgraded all their servers

 

http://www.edugeek.net/forums/cloud-services/226361-owa-outlook-web-access-very-very-slow-load-intermittent-but-happens-often.html

[ckedu-local]

Ever since portal.office.com redirect to microsoft365.com I've been having this issue too

 

Seems to resolve it self after you manually browse to add /mail/ onto end of the outlook URL (https://outlook.office.com/mail/)

 

Interesting to see if the senso fix above also resolves this..

[johnpd]

Thank you Simon

 

Looks like everyone is mentioning SENSO and your url's will help.

 

Interestingly we have co-management with SCCM and Intune and I noticed check ins on some of the device info panes were not working!

 

John

[johnpd]

We have Sophos XG with typical filtering grep formula to allow %a-z etc for office.com, or outlook.office.com / outlook.office365.com but since April/May time a number of clients/users on our wired lan get a HTTP2 frame error and OWA won't load. There are no filtering blocks appearing in the Sophos XG logs either.

 

Has anyone had issues with this error recently and if so have you solved it?

 

Sites all running latest firmware.

 

Thanks

John

 

Thank you all who have posted - SENSO is indeed on our machines - we will get onto this shortly and report back!

13:26 28.06.23

John

[RobFuller]

So far so good with whitelisting the above URLS in Senso.

[johnpd]

Do I include the leading | and ensure each url is separated by | ?

[RobFuller]

No leading | only use to separate.

[ckedu-local]

This was a SENSO issue for us. We added the following to our SSL bypass list in our senso logging policy.

 

|intunecdnpeasd.azureedge.net|microsoft.com|windows.net|office.com|office365.com|onedrive.com|sharepoint.com|

 

You will see we also have some Intune addressee's in as well, as it broke Intune devices calling in.

 

Hope that helps

 

Simon

 

Just to update everyone, this resolved the issue for me straight away - cheers Simon!