Cannot connect to sever web sites.

I am running multiple services with the latest version of OS X 10.6 Server on my MacMini (web, mail, ichat, address book, etc.) . When I try to open my websites I get an "unable to find sever message". Everything has been working fine for the last 2 years and no changes have been made to the server settings, ISP, or DNS. All other services are working as they should. The server is hooked up to an Airport Extreme via a cable modem with a static IP. I have tried the following thus far:
1) restarted the server, airport extreme, and cable modem
2) checked the DNS via the web and my site addresses are pointing to my static IP address
3) turned Web services off and on again in Server Admin
4) checked the Airport port mapping to make sure Web Service (Port 80) was still open
Any idea what's causing the problem???
Thank you.

Gracoat,
I checked all cables and they are plugged in and seated properly.
I typed "changeip -checkhostname" in the terminal and got "serveradmin must be run as root" ...(sorry, I'm not a command line kinda guy)
Here is a cut/paste of some recent log activity (I X'd out some info for privacy):
Apr 29 11:38:32 xxxxxx-corp jabberd/c2s[231]: [8] [::ffff:10.0.1.3, port=51868] connect
Apr 29 11:38:32 xxxxxx-corp jabberd/c2s[231]: SASL callback for non-existing host: xxxxxx-corp.com
Apr 29 11:38:32 xxxxxx-corp jabberd/c2s[231]: [8] [::ffff:10.0.1.3, port=51868] disconnect jid=unbound, packets: 0
Apr 29 11:38:35 xxxxxx-corp jabberd/c2s[231]: [8] [::ffff:10.0.1.3, port=51869] connect
Apr 29 11:38:35 xxxxxx-corp jabberd/c2s[231]: SASL callback for non-existing host: xxxxxx-corp.com
Apr 29 11:38:35 xxxxxx-corp jabberd/c2s[231]: [8] [::ffff:10.0.1.3, port=51869] disconnect jid=unbound, packets: 0
Apr 29 11:38:38 xxxxxx-corp jabberd/c2s[231]: [8] [::ffff:10.0.1.3, port=51870] connect
Apr 29 11:38:38 xxxxxx-corp jabberd/c2s[231]: SASL callback for non-existing host: xxxxxx-corp.com
Apr 29 11:38:38 xxxxxx-corp jabberd/c2s[231]: [8] [::ffff:10.0.1.3, port=51870] disconnect jid=unbound, packets: 0
Apr 29 11:38:39 xxxxxx-corp org.apache.httpd[47665]: Syntax error on line 13 of /etc/apache2/proxy_sites/0000_any_8443_localhost.conf:
Apr 29 11:38:39 xxxxxx-corp org.apache.httpd[47665]: SSLCertificateKeyFile: file '/etc/certificates/xxxxxx-corp.com.XXXXXXXXXXXXX9747C96C30F1986D48D59D227F1.key .pem' does not exist or is empty
Apr 29 11:38:39 xxxxxx-corp com.apple.launchd[1] (org.apache.httpd[47665]): Exited with exit code: 1
Apr 29 11:38:39 xxxxxx-corp com.apple.launchd[1] (org.apache.httpd): Throttling respawn: Will start in 10 seconds
Apr 29 11:38:41 xxxxxx-corp jabberd/c2s[231]: [8] [::ffff:10.0.1.3, port=51872] connect
Apr 29 11:38:41 xxxxxx-corp jabberd/c2s[231]: SASL callback for non-existing host: xxxxxx-corp.com
Apr 29 11:38:41 xxxxxx-corp jabberd/c2s[231]: [8] [::ffff:10.0.1.3, port=51872] disconnect jid=unbound, packets: 0
Apr 29 11:38:44 xxxxxx-corp jabberd/c2s[231]: [8] [::ffff:10.0.1.3, port=51873] connect
Apr 29 11:38:44 xxxxxx-corp jabberd/c2s[231]: SASL callback for non-existing host: xxxxxx-corp.com
Apr 29 11:38:44 xxxxxx-corp jabberd/c2s[231]: [8] [::ffff:10.0.1.3, port=51873] disconnect jid=unbound, packets: 0
Apr 29 11:38:47 xxxxxx-corp jabberd/c2s[231]: [8] [::ffff:10.0.1.3, port=51874] connect
Apr 29 11:38:47 xxxxxx-corp jabberd/c2s[231]: SASL callback for non-existing host: xxxxxx-corp.com
Apr 29 11:38:47 xxxxxx-corp jabberd/c2s[231]: [8] [::ffff:10.0.1.3, port=51874] disconnect jid=unbound, packets: 0
Apr 29 11:38:49 xxxxxx-corp org.apache.httpd[47667]: Syntax error on line 13 of /etc/apache2/proxy_sites/0000_any_8443_localhost.conf:
Apr 29 11:38:49 xxxxxx-corp org.apache.httpd[47667]: SSLCertificateKeyFile: file '/etc/certificates/xxxxxx-corp.com xxxxxxxxxxxxxxxxC96C30F1986D48D59D227F1.key.pem' does not exist or is empty
Apr 29 11:38:49 xxxxxx-corp com.apple.launchd[1] (org.apache.httpd[47667]): Exited with exit code: 1
Apr 29 11:38:49 xxxxxx-corp com.apple.launchd[1] (org.apache.httpd): Throttling respawn: Will start in 10 seconds
Apr 29 11:38:50 xxxxxx-corp jabberd/c2s[231]: [8] [::ffff:10.0.1.3, port=51877] connect
Apr 29 11:38:50 xxxxxx-corp jabberd/c2s[231]: SASL callback for non-existing host: xxxxxx-corp.com
Apr 29 11:38:50 xxxxxx-corp jabberd/c2s[231]: [8] [::ffff:10.0.1.3, port=51877] disconnect jid=unbound, packets: 0
I attempted to open my websites, and connect remotely via VPN, from multiple sources without any luck ...it appears the server cannot be reached. All worked fine a few days ago and had been for quite some time.
My SSL certificate expired several months ago and I created a new one back then. It worked after the new certificate was installed and is still current. I have tried disabling SSL in the sites security settings but still they cannot be reached.
The only changes I can think of that may have been made in recent months to the sever is a system software update. Other than that, I'm at a loss. Any help is greatly appreciated!!

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