WordPress MU

I added a new blog using Add Blog. http://abc.example.com/user1. What are the next steps.
I amt trying to access http://abc.example.com/user1 but no success.

Please review the readme file and make sure you've followed all of the steps in there. Please don't say you have because that file points you to the "next steps":

http://codex.wordpress.org/Debugging_WPMU

Thanks for the response. Are you referring to http://trac.mu.wordpress.org/browser/trunk/README.txt ? I completed the install successfully and then I tried to create a blog site http://abc.example.com/user1 using Add Blog. I received a 404 error trying to access the new page http://abc.example.com/user1

I am pretty sure tdjcbe is referring to this part of the README.txt:

3. In the <VirtualHost> section of the config file for your host there
28 	will be a line defining the hostname. You need to add the following
29 	if you want virtual hosts to work properly:
30 	"ServerAlias *.domain.tld"
31 	Replace domain.tld with whatever your one is, and remove the quotes.
32
33
34 	DNS
35 	===
36 	If you want to host blogs of the form http://blog.domain.tld/ where
37 	domain.tld is the domain name of your machine then you must add a
38 	wildcard record to your DNS records.
39 	This usually means adding a "*" hostname record pointing at your
40 	webserver in your DNS configuration tool.
41 	Matt has a more detailed explanation:
42 	http://ma.tt/2003/10/10/wildcard-dns-and-sub-domains/

more exactly: did you add a * hostname record and did yo uadd ServerAlias *.domain.tld?

I am not using http://blog.domain.tld/. I am using http://domain.tld/user1.

:-) my bad, really sorry to have jumped the gun on you...

Check your main blog's permalinks. If they don't work either, it's a mod_rewrite issue.

If mod_rewrite is installed, then maybe the account is not set to read the htaccess file.

If all that is confusing, ask your host.