Hey all, so I am trying to figure out, why I can’t connect remotely to my router using Back to Home in some cases. I can connect from my mobile, but I can’t connect using my laptop via Ethernet cable not via some wifi connections. I’ve found a wifi connection that works but not on others. What might be the issue here ?
At a guess, it’s could be the network you are connected to blocking ports. I don’t have Back to Home setup, and a quick search doesn’t turn up what ports it requires. But, it looks like it’s a special use case of WireGuard. And the MikroTik documentation states that the default for WirGuard on MikroTik products is 13231 (source). Some networks may be configured to block all outbound ports which aren’t the basic ones (80, 443). Some may also allow things like 500 and 4500 for L2TP, but that list could still be quite limited and not include 13231 or whatever port Back to Home is using.
Another possibility would be DNS issues (it’s always DNS). Back to Home seems to rely on some sort of Dynamic DNS (DDNS) system to associate your home IP with a dynamic domain (source). If the network provider you are connecting to is engaging in some sort of DNS fuckery, they may be blocking queries to known DDNS domains. This can often be done as a security measure, since DDNS services used to be in really common use by malware.