HTTPS very slow. HTTP fast

[steveJCUK]

Weird problem I spent most of yesterday on.

Our website for LMS has an upload function. Regularly teachers upload large files (videos).

Nearly every machine in school is slow. (150mb file 2 mins HTTPS, over http forcing the site to go that way 5 seconds, 1gb connection).

 

Even from a machine connected to the router, the same applies. This rules out filter and firewall.

 

The website in particular allows http with ip albait a lot of warnings.

 

Cannot Ping website (was).

Reduced MTU to test.

Tested on isp router (so no firewall and filter involved) and before that added a shed load of excludes to web filter and firewall.

Macs do it too. iPads do it. Windows does it.

5 servers do not do it!! But then I have 40 that do act slowly while uploading a file.

 

Obviously the answer is not to not use http.

 

Schoology is the site in question.

Google drive for instance works fine.

 

Thoughts any one?

 

Thanks in advance.

Edited October 18, 2019 by steveJCUK

[Norphy]

Have you got HTTPS inspection turned on at your firewall? If so, have you tried putting in an exception for that site?

[steveJCUK]

Yeah. Sorry. Should have clarified better when I said tested on the router - meaning the isp router.