After Upgrading to 17.7.8 I can't access websites over http anymore, just https

[schmoetz]

After upgrading to 17.7.8 I can't access webpages over plain http anymore, just https works (and even that seems to be slower than before).

I tried disabling the proxy to see if the fault is there, but that was no success.

DNS works and I also can ping the domains directly that don't work. But I can't connect to pages, that don't use https.

Can somebody please give me advise where I could possibly search for the fault?

I didn't change any settings and with 17.7.7 everything worked fine.