When using LocalForward or DynamicForward sometimes the endpoint does no longer exist but I need to find out *which* endpoint exactly. For example: $ ssh -D 1234 server.example.net On the client, maybe in another terminal: $ curl --socks5-hostname localhost:1234 http://does-not-exist.local curl: (97) connection to proxy closed As expected. But on the server (OpenSSH 8.4), the following is printed on stderr: channel 5: open failed: connect failed: Name or service not known OK, now in this simple case I know that this is about "does-not-exist.local", which I know does not exist. But with multiple LocalForward directives specified, and with DynamicForward active too (the client is dictating the destination here), I'd like to find out *which* name cannot be resolved ("Name or service not known") or contacted. Current scenario: my web browser is using localhost:1234 as its SOCKS proxy and I have some tab open which may send requests to some not-existing (or non-resolving) name and my SSH session is semi-flooded with these messages above. Why mildly annoying, I'm curious which browser tab to close :-) I tried to strace(1) the sshd process on the remote side to find out, but I'm not allowed to ptrace() my own sshd process :( Does anybody have an idea how to find out the culprit here? Ideas welcome. Thanks, Christian. -- BOFH excuse #190: Proprietary Information. _______________________________________________ openssh-unix-dev mailing list openssh-unix-dev@xxxxxxxxxxx https://lists.mindrot.org/mailman/listinfo/openssh-unix-dev
