No Internet Connection/Manifest Unavailable error - how to fix?

[velja?]

Basically, title says it all. Can't seem to update CS2. I have tried:
Reinstalling Steam;
Changing download region from Bulgaria to The Netherlands;
Disabling firewall;
Flushing DNS.
Any ideas?

[velja?]

Still having the issue, I can't download updates for any games. Barely downloaded updates for PUBG, Call of Duty Black Ops, etc.
Even changed regions from EU to US just to check.
Any help would be appreaciated.

[eikyu]

I have the same problem. Can not update any Steam-Game, can not download from Workshop and can not use the Steam-Cloud.
If i wanna download, it says: no internet connection.
The Support says: we are sorry, read the forum.

Provider says to me: you have connection, the speed is all right... we can nothing do for you.

[asur11]

I am having the same issues for the last 30 hours.

Trying to download either says "No internet connection" or "Manifest unavailable".
Trying to launch the games via Steam returns "An error occurred while launching this game: no internet connection".
Launching games directly from the folder gives me 2 results:
1) For some offline games, I can play but get "Unable to Sync" to the Steam Cloud
2) Fail to fully launch and says "no internet connection" or "Backend Error"

I can still chat and use several other features.
I've tried:
1) Changing the download region multiple times to different countries (I am from the US)
2) Designating specific IP for my IPv4 and IPv6
3) Restarting my modem
4) Updating Steam
5) Clearing Steam Cache
6) Disabling antivirus (Kaspersky Total Security)
7) Adding Valve and Steam to the trusted/unrestricted list

Any help is appreciated.

[cSg|mc-Hotsauce]

Try the Melbourne or Seoul download servers.

[velja?]

Nothing works, tried both Melbourne and Seoul.

[velja?]

Almost full day later (since the post), still cannot download anything. Same errors. I'm slowly losing nerves at this point.