OS: CentOS 7can
Firewall: Port 23 open
I have an issue with SBBS and allowing telnet logins. It appears that I
access it just fine if I SSH to the box and then "telnet localhost" but if try from another PC on the network I get a connection refused message. I believe
it may have to do with something regarding ipv6 and ipv4. I noticed when I telnet to localhost it fails on the ipv4 address, then works on the ipv6 address.
The log files contain this, which isn't really telling me much...
Feb 06 19:47:56 bbs synchronet[6132]: term 0052 !ERROR 95 setting socket option (TCP_NODELAY, 1) to 1
Firewall is confirmed that port 23 is open.
So... telnetting to 127.0.0.1 fails?
What interfaces do you have the telnet server configured to listen on?
Firewall is confirmed that port 23 is open.
Is sbbs successfully binding to and listening on port 23?
Re: Telnet issues for SBBS
By: Digital Man to Dmxrob on Wed Feb 06 2019 05:57 pm
So... telnetting to 127.0.0.1 fails?
What interfaces do you have the telnet server configured to listen on?
telnet to 127.0.0.1 works, but telnet to bbs (the dns name with the actual IP) fails.
telnet bbs
Trying 192.168.86.20...
telnet: connect to address 192.168.86.20: Connection refused
Nothing shows up in the SBBS log; and eventually the connection just times out.
Firewall is confirmed that port 23 is open.
Is sbbs successfully binding to and listening on port 23?
Port 23 is open and listening...
tcp LISTEN 0 128 127.0.0.1:23 *:*
tcp LISTEN 0 128 127.0.0.1:23 *:*
If that's the *only* addr:port it's listening on, then that explains why connections to your 192.168.* address don't work.
Try either changing your TelnetInterface (in sbbs.ini) to 0, or add the 192.168.* interface to the list of interfaces for the server to listen on.
I think its odd nothing shows up in the logs or messages. Beginning to wonder if this is a VMware network issue. I'll keep digging.
Re: Telnet issues for SBBS
By: Digital Man to Dmxrob on Thu Feb 07 2019 09:25 am
tcp LISTEN 0 128 127.0.0.1:23 *:*
If that's the *only* addr:port it's listening on, then that explains why connections to your 192.168.* address don't work.
Try either changing your TelnetInterface (in sbbs.ini) to 0, or add the 192.168.* interface to the list of interfaces for the server to listen on.
I've verified that it is binding correctly, and have changed it to the correct IP. However, the behaiour is still the same. If from the bbs machine I "telnet bbs" it works, but if I try from any other PC in the network, it does not.
Other interfaces work just fine -- HTTP, for example.
I think its odd nothing shows up in the logs or messages. Beginning to wonder if this is a VMware network issue. I'll keep digging.
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