by want » Wed, 22 Jan 2003 12:37:35
I am using RH8. In order to check the server security level, i used SuperScan
to check the "Listen" port.
Finally, I found the following:
22 [ssh]
23 [telnet]
25 [smtp]
53 [domain]
80 [http]
110 [pop3]
111 [sunrpc]
8000 [irdmi]
Except 110, 111 & 8000, the others are needed...
Therefore, I tried to disable those 3 ports.
How can i do it? Is it related to /etc/services ?
Thx all you kindly folks!
wanto
by ynotsso » Wed, 22 Jan 2003 13:25:35
> 22 [ssh]
> 23 [telnet]
> 25 [smtp]
> 53 [domain]
> 80 [http]
> 110 [pop3]
> 111 [sunrpc]
> 8000 [irdmi]
> Except 110, 111 & 8000, the others are needed...
> Therefore, I tried to disable those 3 ports.
> How can i do it? Is it related to /etc/services ?
> Thx all you kindly folks!
Please see the chkconfig man page for more information and usage.
tony
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by Kasper Dupon » Wed, 22 Jan 2003 15:07:28
> Folks,
> I am using RH8. In order to check the server security level, i used SuperScan
> to check the "Listen" port.
> Finally, I found the following:
> 22 [ssh]
> 23 [telnet]
> 25 [smtp]
> 53 [domain]
> 80 [http]
> 110 [pop3]
> 111 [sunrpc]
> 8000 [irdmi]
> Except 110, 111 & 8000, the others are needed...
> Therefore, I tried to disable those 3 ports.
Disable the service listening on the port. On RH you canQuote:> How can i do it?
service name stop
And you can prevent it from being started at next boot
by typing:
chkconfig name off
I'm not sure exactly which services are listening on those
ports, but I guess it is sendmail on port 110. As root you
can get the name of the programs by typing:
netstat -tupl
Nope. Don't change /etc/services.Quote:> Is it related to /etc/services ?
--Quote:> Thx all you kindly folks!
> wanto
by ynotsso » Wed, 22 Jan 2003 16:15:30
[...]
[...]Quote:> Disable the service listening on the port. On RH you can
> disable a service for the current session by typing:
> service name stop
> And you can prevent it from being started at next boot
> by typing:
> chkconfig name off
> I'm not sure exactly which services are listening on those
> ports, but I guess it is sendmail on port 110. As root you
> can get the name of the programs by typing:
> netstat -tupl
"chkconfig --list" will give the service names that chkconfig recognizes
as arguments.
A pop3 daemon listens (by default) on port 110. "lsof -i" will show
all port usage as well as netstat, and /etc/services shows port assignments.
tony
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