[TriLUG] se linux with sshd on port 443

[Jym Williams Zavada]

If you're working remotely via an ssh session, you should verify any config 
changes to ssh before you reboot or restart sshd.  Otherwise, if your config 
contains errors you WILL lock yourself out of your system!!!!  You check the 
config changes safely by running sshd in "test mode":

sshd -t

If your modified config file contains errors it will list them, and if there 
are no errors there will be no output.

Also, if you're concerned at all about losing your ssh session connection 
while testing config changes, or prefer to not reboot, you can send a HUP 
signal to the PID of the primary sshd daemon process (the one owned by root 
and not a privilege separator process and whose PPID is 1) as shown below. 
When the sshd daemon receives a HUP it restarts only itself, while leaving 
all ssh session processes intact.

ps -ef|awk '{if((NR==1)||(($0~/sshd/)&&($0!~/\[priv\]/)&&($1=="root")&&($3==1))){print$0;}}'

This will print output similar to:

UID        PID  PPID  C STIME TTY          TIME CMD
root      1075     1  0 Apr04 ?        00:00:00 /usr/sbin/sshd

Using the PID listed in the output, you can then run:

kill -HUP [PID]

NOTE: for readability, here is the same ps/awk command-line with ample 
whitespace and line-continuation characters:

ps -ef | awk '{ \
   if ( (NR == 1) || \
        ( ($0 ~ /sshd/) && \
          ($0 !~ /\[priv\]/) && \
          ($1 == "root") && \
          ($3 == 1) ) \
      ) { \
     print $0; \
   } \
}'


On Thu, 24 Jun 2010, Ron Kelley wrote:

> /etc/ssh/sshd.conf
>
> Change the port setting then reboot or restart sshd.
>
> Thanks,
>
> -Ron
> Sent from my iPhone
>
> On Jun 24, 2010, at 21:25, Ralph Blach <chipperb at nc.rr.com> wrote:
>
>> Ok all you experts out there, I want to run se linux but I want sshd on port 443.  How do I reconfigure sshd to accomplish this.
>>
>> Thanks
>>
>> Chip