CSGO suddenly cant join any servers

I cannot join any CSGO official servers since monday.

I can join any unofficial servers. I can go surfing and play on faceit but cant warm up in deathmatch or arms race.

I get this error code

No ping data available.
Unable to communicate with ANY of 45 Steam Datagram routing cluster.  Possible problem with local internet connection?
RelayNetWorkStatus:  avail=Failed  config=OK  anyrelay=Failed   (Unable to communicate with ANY of 45 Steam Datagram routing cluster.  Possible problem with local internet connection?)

[#1160826438 SDR server steamid:90140379019670538(vport 0)] problem detected locally (3002): Cannot talk to any relays. Check Internet connection
Steam Net connection #1160826438 SDR server steamid:90140379019670538(vport 0) problem detected locally, reason 3002: Cannot talk to any relays. Check Internet connection
**** Unable to localize '#GenericConfirmText_Label' on panel descendant of 'PopupManager'
Closing Steam Net Connection to (unknown), handle 4530ce46 (2001 Matchmaking failed.  We never heard from gameserver)
Summary of connection to #1160826438 SDR server steamid:90140379019670538(vport 0):
Router network: Failed
End-to-end connection: closed due to problem detected locally, reason code 3002.  (Cannot talk to any relays. Check Internet connection)
    Remote host is in data center 'iad'

found a few answers on steam community discussions but none helped me:

verified file integrity: check

reinstalled csgo: check

lauched steam with -tcp: check

the only thing i cannot do is lower the firewall settings on my router since im in college and the router belongs to the boarding house.