Problem: How to remove annoying S/Key prompt from ssh login.  Example below:

>ssh goldberg
otp-md5 370 go7860 ext
S/Key Password:
otp-md5 154 go0658 ext
S/Key Password:
otp-md5 157 go7847 ext
S/Key Password:
ott@goldberg.cs.unc.edu's password:

Solution: As follows.

1. Uncomment this line in /etc/ssh/sshd_config.

ChallengeResponseAuthentication no

2. Get sshd process id:

> ps aux | grep sshd
root     115  0.0  0.1  2596  524  ??  Is   Fri06PM   0:01.96 /usr/sbin/sshd
root   45727  0.0  0.2  3048 1844  ??  I     9:57AM   0:02.19 sshd: clark@ttyp2 (sshd)
root   49695  0.0  0.1  2700 1544  ??  S     1:36PM   0:00.09 sshd: ott@ttypc (sshd)

3. As root, send SIGHUP signal to running sshd process.

> kill -s HUP 115


D. Ott 3/25