On Wed, Dec 16, 2020 at 09:37:08AM -0600, wors...@bellsouth.net wrote: > While installing a new router, I changed my local network from 192.168.4.* > to 192.168.50.*. This seems to have broken Cygwin sshd on both of my remote > computers, but only for Cygwin; sshd works fine if I boot the remote > computer from a linux thumb drive. I have noticed no other problems with the > new network configuration. > -------- > ssh -vvv does not give any messages that look useful to me. Authentication > problems usually give some useful message, but this seems to fail before > getting that far: > > ssh -vvv $ASUS12 > OpenSSH_8.3p1, OpenSSL 1.1.1f 31 Mar 2020 > debug1: Reading configuration data /home/cdr/.ssh/config > debug1: /home/cdr/.ssh/config line 1: Applying options for * > debug1: Reading configuration data /etc/ssh_config > debug2: resolve_canonicalize: hostname 192.168.50.105 is address > debug2: ssh_connect_direct > debug1: Connecting to 192.168.50.105 [192.168.50.105] port 22. > debug1: connect to address 192.168.50.105 port 22: Connection timed out > ssh: connect to host 192.168.50.105 port 22: Connection timed out > ----------- > The server is running, as confirmed by cyrunsrv -Q sshd. > /var/log/sshd.log is an empty file. > ------- > nmap shows port 22 open on the remote server: > nmap -p22 $ASUS12 > Nmap scan report for asus12 (192.168.50.105) > Host is up (0.13s latency). > PORT STATE SERVICE > 22/tcp filtered ssh > ---------- > However, telnet fails before returning the expected header string: > telnet $ASUS12 22 > Connecting To 192.168.50.105...Could not open connection to the host, on > port 22 > : Connect failed > (For comparison, linux returns the string "SSH-2.0-OpenSSH_7.9p1 > Debian-10+deb10u2") > -------
I think 'filtered' means there is something in the way. Is all this on the same LAN but with a new router? Are the connections wireless? I would try the telnet test from the server itself, both to its external address and to localhost. All in search of clues. This seems like a networking issue or a specific configuration on the server that limits client access or listening ports. Stephen > I can't think what to try short of reinstalling sshd. > > -- > Problem reports: https://cygwin.com/problems.html > FAQ: https://cygwin.com/faq/ > Documentation: https://cygwin.com/docs.html > Unsubscribe info: https://cygwin.com/ml/#unsubscribe-simple -- Problem reports: https://cygwin.com/problems.html FAQ: https://cygwin.com/faq/ Documentation: https://cygwin.com/docs.html Unsubscribe info: https://cygwin.com/ml/#unsubscribe-simple
