Recently subscribed to BT broadband Unlimited Extra service. I find I can't connect out to external servers on ports 22 & 23 (ssh & telnet).
I am using the BT-supplied SmartHub router but have also tried with an ASUS DSL-AC88U with the same result.
Just to be clear - this is OUTWARD connection, where the default router firewall setting is to allow all outward connections.
I have checked this behaviour against an external server and also using portquiz.net. In both cases the connection just times out without connection.
I have tried the following to narrow down the issue:
1. Disabled router firewall - makes no difference.
2. Disabled PC firewall - makes no difference.
3. Tried from multiple client PCs and also mobile/tablet - makes no difference.
If I connect via the O2 4G network (from an iPhone or a PC using personal hotspot) then I can connect OK on ports 22 & 23, so the issue is not with the client PC.
So either the routers (both BT & ASUS) are blocking outward connections on ports 22 & 23, even with the firewall off) or BT are blocking the connections somewhere in their network.
I called BT Tech Experts who (after a long and irrelevant discussion about port forwarding) said that their network does not block these ports.
Does anyone else have this problem, or can anyone suggest something I haven't tried?
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Are you on the BT Unlimited Broadband Extra package with a copper connection?
I'm on Infinity1 with a copper connection. Broadband package will have no bearing on the problem.
Do you have something like NetProtect enabled? Browsers by default don't like trying to use these ports for outgoing communications. Had a friend try to connect to my server, I changed the port to 22 both on the server and in the router first and then to 23 after a successful connection using 22. 23 worked as well.
Can you post a traceroute to bbc.co.uk just to see if it sheds any light on the issue?
Perhaps also another to the destination you are trying to reach, please?
Here's a tracert to portquiz.net which I use to test port accessibility. Couple of timeouts but basically works.
If I issue a command "telnet portquiz.net 80" it works fine - opens an http connection. Same with most other ports. But "telnet portquiz.net 23" (or 22) doesn't open a connection.