[리눅스]Fix the "Bind to port 22 on 0.0.0.0 failed : Address already in use" error

 

Posted on March 30, 2006

The error when starting and restarting sshd :
Mar 30 23:35:11 x sshd[9151]: Server listening on :: port 22.
Mar 30 23:35:11 x sshd[9151]: error: Bind to port 22 on 0.0.0.0 failed: Address already in use.
Mar 30 23:38:07 x sshd[9151]: Received signal 15; terminating.
Mar 30 23:38:07 x sshd[1977]: Server listening on :: port 22.
Mar 30 23:38:07 x sshd[1977]: error: Bind to port 22 on 0.0.0.0 failed: Address already in use.

A successful connection made to the server despite the issue :
Mar 30 23:40:46 x sshd[2421]: Accepted publickey for root from ::ffff:xxx.xxx.xxx.xxx port 13586 ssh2

The fix : disable IPv6 :
echo "alias net-pf-10 off" >> /etc/modprobe.conf
restart the machine

Restarting the machine with IPv6 disabled :
Mar 30 23:47:57 x sshd[1957]: Server listening on 0.0.0.0 port 22.
Mar 30 23:48:46 x sshd[2470]: Accepted publickey for root from xxx.xxx.xxx.xxx port 13600 ssh2