As LivinFree said, port 80 is a root-privileged port, so you should start Apache as root. Or get away from the root-privileged port by changing it to something higher than 1024. The config file will be in Apache/conf directory, and will be either httpd.conf or httpds.conf. Do "ls -lu" on these two files to see which is being accessed. The line you want to change is "Port 80".

Livinfree & Jimbo,
Thanks a lot.

I am running apachectl as root only. but eventhough i am getting the same.

Also I tried as changing the Port 80 to Port 1080.

I got the results in the Log file as :

[Sat Nov 17 01:50:53 2001] [warn] pid file /usr/local/apche/logs/httpd.pid overwritten -- Unclean shutdown of previous Apache run?
[Sat Nov 17 01:50:53 2001] [error] (22)Invalid argument: shmctl() could not set segment #7800
[Sat Nov 17 01:50:53 2001] [notice] Apache/1.3.20 (Unix) configured -- resuming normal operations

I cant understand about the error :
Invalid argument: shmctl() could not set segment #7800.

What should i do to proceed?
Anent

Looks like you did not get a clean shutdown, still had some Apache processes running, and this new startup could not gain access to a shared memory segment.

Shut Apache, and make sure all Apache processes are gone:

ps -ef | grep -i apache

Kill any that are still hanging around. Then clean out the Apache/logs directory and try starting up again.