What would cause apache not to restart after logrotate and how would I determine this?

It should write something to the error_log if it fails to start.

here is the error I get

[Mon Sep 8 04:03:53 2003] [error] mod_ssl: Init: (***********:443) Ops, no RSA or DSA server certificate found?!
[Mon Sep 8 04:03:53 2003] [error] mod_ssl: Init: (x***********:443) You have to perform a *full* server restart when you added or r
emoved a certificate and/or key file
[Mon Sep 8 06:29:46 2003] [notice] Apache/1.3.27 (Unix) (Red-Hat/Linux) mod_ssl/2.8.12 OpenSSL/0.9.6b DAV/1.0.2 PHP/4.1.2 mod_perl
/1.26 configured -- resuming normal operations

I changed the host sddress, would that be the problem and all I have to do is reboot the server now to fix this?

If you're running SSL, apache needs to be fully stopped then started, not restarted. Also, if you changed the host address, you'll probably need to generate a new SSL cert for that hostname before running Apache SSL.

You can fix this by replacing "reload" with "graceful" in the postrotate command in your logrotate config.