There has been a near-total Internet shutdown in Kazakhstan since 2022-01-05, with only a few hours of partial connectivity per day. From correspondence with some of the people affected, it appears that, for whatever reason, proxies on TCP port 3785 are accessible during the shutdown, at least on Kaz Telecom, the largest ISP. I set up an obfs4 bridge on port 3785 and a user reported that it was reachable.

It might be a good idea to push to have a few bridges that run on port 3785, at least for the front desk to hand out?

httpe://ntc.party/t/network-shutdown-all-around-kazakhstan/1601 https://github.com/net4people/bbs/issues/99

https://ntc.party/t/network-shutdown-all-around-kazakhstan/1601/14

SOCKS5 proxy 3785 port works fine. Not sure why, VoIP using skype and other services works as well, so I guess 3785 may be used for VoIP

in general, it’s easy to configure in telegram, but if clients are able to configure proxy on their OS(for example using proxifyer) https and all other traffic works as well.

This has been tested in at least 3 regions.

https://ntc.party/t/network-shutdown-all-around-kazakhstan/1601/16

...

I am not familiar with that one either. nmap-services calls it bfd-echo “BFD Echo Protocol”. RFC 5881 says it is a UDP protocol:

Yeah, if it’s not VoIP I have no idea why it works. I guess people found it out by brute-forcing different ports

https://ntc.party/t/network-shutdown-all-around-kazakhstan/1601/17

Here is an obfs4 bridge on port 3785 (IPv4 and IPv6) to try in Tor Browser:

https://ntc.party/t/network-shutdown-all-around-kazakhstan/1601/19

The IPv4 obfs4 bridge is working!