All Visual Studio updates are blocked.
Win updates work though.

你好你专业人士,在我4011的连接to the MS VS updates is blocked.
And I have no idea why.
If I connect the affected computer directly to the Fritzbox, it works - but not via the VLAN of the Mikrotik.
I disabled all drop rules in the firewall filter rules as a test, but the update page still says "The connection to the remote server cannot be established."
What could be the cause of this?

I have to say that I only know the Mikrotik rudimentarily.
It would be nice if one of you could help me with that.
Because laying a cable through the office every time, swap the LAN-Cables on the work-PC, changing the IP on the PC, loading the update, change IP back to VLAN, reconnecting LAN cables is really annoying.

Best regards and a happy new year @all

PS The image shows Fiddler's monitoring message
So how do I teach my kind, uh router, to communicate with the VS servers?

Have you also checked raw rules in firewall ? Layer 7 rules ?
Did you setup that firewall yourself ?

Best to show full config (minus serial number and any public IP info).

Not sure, but usually 502 is a server error, not something blocked

Hmmm ... could still be the router.

MTU size?

Without full disclosure on the config we can all go into a delirium tremens and still not know what to do

«All your base are belong to us»

Have you tried turning it off and on again?