Unknown https call from my computer

Question

I captured weird call history from Fiddler.

The call repeatedly occurred.

I searched it with several keywords, but there were no clues.

Anyone know about

Answer 1

Yeah, I've seen this before, coming from the Windows Explorer process. It's harmless, but basically what's happening is the client is trying to send non HTTP traffic through a HTTPS proxy tunnel, and because it's not legal HTTPS traffic, you get the weird parsing errors as shown in your screenshot.

Sadly, I don't remember my findings about what specific Windows feature causes this. See the wnpconnmanager.cpp remark at https://github.com/cvandeplas/plaso/blob/master/test_data/skydriveerr.log, maybe this is from the Windows Notification Service?