sshd.exe waits repeatedly with SYN_SENT for inaccessible ldap
basinilya@gmail.com
basinilya@gmail.com
Tue Jan 26 13:31:05 GMT 2021
The problem is solved.
Our DHCP server was sending me a bad WINS server ip. After fixing the issue I had to reboot the PC (just refreshing the ip and restarting cygsshd was not enough).
On 22.01.2021 22:07, basinilya@gmail.com wrote:
> Hi. The problem first appeared ten days ago. It now takes minutes to login as a domain user. Tcpview shows that sshd.exe is trying to connect an inaccessible server on the port 389 (ldap). If I close the socket using Tcpview, successful login happens sooner. Both password and public key logins are affected, but with a public key sshd.exe tries to connect that server multiple times. Also, if I don't close the sockets repeatedly, ssh disconnects from the SSH server after 2 minutes of silence before the "last login" line appears:
>
> $ time ssh -vvv localhost
> ...
> debug1: Offering public key:
> debug3: send packet: type 50
> debug2: we sent a publickey packet, wait for reply
>
>
> debug3: receive packet: type 60
> debug1: Server accepts key:
> debug3: sign_and_send_pubkey: RSA
> debug3: sign_and_send_pubkey: signing using rsa-sha2-512
> debug3: send packet: type 50
>
>
> Connection closed by ::1 port 22
>
> real 2m0.292s
> user 0m0.045s
> sys 0m0.122s
>
>
>
> Besedes, sshd.exe has a live connection on port 389 to another server all the time.
>
>
> I can't see anything interesting in sshd log. At least the ldap ip address does not appear in the log.
>
> ...
> <TimeCreated SystemTime="2021-01-22T18:52:09.7210295Z" />
> <Data>sshd: PID 1786: debug1: temporarily_use_uid: 1087042/1049089 (e=18/18)</Data>
>
> <TimeCreated SystemTime="2021-01-22T18:52:51.9304939Z" />
> <Data>sshd: PID 1786: debug1: trying public key file /home/basin/.ssh/authorized_keys</Data>
> ...
>
> <TimeCreated SystemTime="2021-01-22T18:53:21.6284471Z" />
> <Data>sshd: PID 1786: debug1: temporarily_use_uid: 1087042/1049089 (e=18/18)</Data>
> ...
>
>
> <TimeCreated SystemTime="2021-01-22T18:54:03.7296838Z" />
> <Data>sshd: PID 1786: debug1: trying public key file /home/basin/.ssh/authorized_keys</Data>
> ...
>
>
> <TimeCreated SystemTime="2021-01-22T18:54:03.7296838Z" />
> <Data>sshd: PID 1786: debug1: monitor_child_preauth: basin has been authenticated by privileged process</Data>
> ...
>
>
> <TimeCreated SystemTime="2021-01-22T18:54:09.6686942Z" />
> <Data>sshd: PID 1652: debug1: main_sigchld_handler: Child exited</Data>
>
> BTW, is it possible to make sshd write to a log file instead of Windows Event Log?
>
>
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