Seems like there are a lot of moving parts to this puzzle. Is there any chance to simplify your setup to get something working?
For example: - disconnect the laptop and desktop from the network - directly connect the desktop to the laptop with an ethernet cable ( most/all NICs have Auto MDI-X these days ) - assign static IPs to both devices, if they aren't already ( e.g. 10.20.30.41 and 10.20.30.42 ) - turn off all firewall rules Test your connection with ping, nmap, and then your ssh process using IPs. If any of those do not work, the search space is very small. If it does work, start adding one piece at a time back in: change back IPs, use hostnames, turn on the firewall, reconnect to the switch/router, etc. until you discover the step at which things don't work any more. Just one in a sea of possible solutions. Regards, - Robert On Fri, Dec 12, 2025 at 6:36 AM Rich Shepard <[email protected]> wrote: > On Thu, 11 Dec 2025, Russell Senior wrote: > > Russell, > > # ( hostname && ip a && ping -c1 caddis && ip n ) > > /tmp/salmo-to-caddis.txt > > $ less /tmp/salmo-to-caddis.txt > salmo > 1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group > default qlen 1000 > link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00 > inet 127.0.0.1/8 scope host lo > valid_lft forever preferred_lft forever > inet6 ::1/128 scope host > valid_lft forever preferred_lft forever > 2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP > group default qlen 1000 > link/ether 0c:9d:92:83:6e:27 brd ff:ff:ff:ff:ff:ff > inet 192.168.55.1/24 brd 192.168.55.255 scope global eth0 > valid_lft forever preferred_lft forever > inet6 fe80::e9d:92ff:fe83:6e27/64 scope link > valid_lft forever preferred_lft forever > PING caddis.appl-ecosys.com (192.168.55.2) 56(84) bytes of data. > From salmo.appl-ecosys.com (192.168.55.1) icmp_seq=1 Destination Host > Unreachable > > --- caddis.appl-ecosys.com ping statistics --- > 1 packets transmitted, 0 received, +1 errors, 100% packet loss, time 0ms > > Rich > >
