Can someone translate this HTTPD error?

Question

This log is from when I start the webserver from server app, I have two virtual host created that should work on port 80 and the default that runs on port 443.
Aug 25 14:11:52 myserver servermgrd[36879]: servermgr_web: enabling
Aug 25 14:11:55 myserver com.apple.launchd.peruser.70[37300]: Background: Bug: launchd_core_logic.c:3063 (24984):3
Aug 25 14:11:55 myserver com.apple.launchd.peruser.70[37300]: Background: job_mig_intran() was confused by PID 37105 UID 70 EUID 70 Mach Port 0x1a07:
Aug 25 14:11:55 myserver com.apple.launchd.peruser.70[37300]: Bug: launchd_core_logic.c:8528 (24984):3: j != NULL
Aug 25 14:11:55 myserver org.apache.httpd[37303]: [Thu Aug 25 14:11:55 2011] [warn] NameVirtualHost 83.246.3.34:80 has no VirtualHosts
Aug 25 14:11:56 myserver servermgrd[36879]: servermgr_web: Disabling port forwarding for port 80
Aug 25 14:11:57: --- last message repeated 1 time ---
Aug 25 14:11:57 myserver servermgrd[36879]: servermgr_web: waiting for pid, file /private/var/run/httpd.pid.
Aug 25 14:11:57 myserver org.apache.httpd[37310]: [Thu Aug 25 14:11:57 2011] [warn] _default_ VirtualHost overlap on port 80, the first has precedence
Aug 25 14:11:57 myserver org.apache.httpd[37310]: [Thu Aug 25 14:11:57 2011] [warn] _default_ VirtualHost overlap on port 443, the first has precedence
Aug 25 14:11:57 myserver com.apple.launchd[1] (org.apache.httpd[37310]): Exited with code: 1
Aug 25 14:11:57 myserver com.apple.launchd[1] (org.apache.httpd): Throttling respawn: Will start in 10 seconds
Aug 25 14:11:58 myserver servermgrd[36879]: servermgr_web: waiting for pid, file /private/var/run/httpd.pid.
Aug 25 14:12:02: --- last message repeated 3 times ---
Aug 25 14:12:02 myserver servermgrd[36879]: servermgr_web: Enabling port forwarding for port 80
Aug 25 14:12:02: --- last message repeated 1 time ---
Aug 25 14:12:02 myserver servermgrd[36879]: servermgr_web: Cannot confirm Apache was started; missing or invalid pid file
Aug 25 14:12:07 myserver org.apache.httpd[37321]: [Thu Aug 25 14:12:07 2011] [warn] _default_ VirtualHost overlap on port 80, the first has precedence
Aug 25 14:12:07 myserver org.apache.httpd[37321]: [Thu Aug 25 14:12:07 2011] [warn] _default_ VirtualHost overlap on port 443, the first has precedence
Aug 25 14:12:07 myserver com.apple.launchd[1] (org.apache.httpd[37321]): Exited with code: 1
Aug 25 14:12:07 myserver com.apple.launchd[1] (org.apache.httpd): Throttling respawn: Will start in 10 seconds
Aug 25 14:12:17 myserver org.apache.httpd[37325]: [Thu Aug 25 14:12:17 2011] [warn] _default_ VirtualHost overlap on port 80, the first has precedence
Aug 25 14:12:17 myserver org.apache.httpd[37325]: [Thu Aug 25 14:12:17 2011] [warn] _default_ VirtualHost overlap on port 443, the first has precedence

Answer 1

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Aug 25 14:11:55 myserver org.apache.httpd[37303]: [Thu Aug 25 14:11:55 2011] [warn] NameVirtualHost 83.246.3.34:80 has no VirtualHosts
That means that "below your NamedVirtualHost specification there is no Virtual Host defined"
VirtualHost are here to allow you to have multiple web pages below the same IP.
A common Virtual Host definition is:
NameVirtualHost *
    <VirtualHost *>
    ServerName www.domain.tld
    DocumentRoot /www/domain
    </VirtualHost>
    <VirtualHost *>
    ServerName www.otherdomain.tld
    DocumentRoot /www/otherdomain
    </VirtualHost>
Following your Log, you have a "NameVirtualHost 83.246.3.34:80" definition without any following "<VirtualHost 83.246.3.34:80>" directive.
All site's configuration files are in /etc/apache2/sites/
Aug 25 14:11:57 myserver org.apache.httpd[37310]: [Thu Aug 25 14:11:57 2011] [warn] _default_ VirtualHost overlap on port 80, the first has precedence
Aug 25 14:11:57 myserver org.apache.httpd[37310]: [Thu Aug 25 14:11:57 2011] [warn] _default_ VirtualHost overlap on port 443, the first has precedence
That two messages means the same, that "there are two identical VirtualHost definitions, so i'll use the first one"
That means that you have two "<VirtualHost XXX>" directives with the same or missing "ServerName" definition.
The Web Server a.k.a. Apache uses the "ServerName" to forward request to one or other definition.
Let's see an example with this missconfiguration:
NameVirtualHost 83.246.3.34:80
  <VirtualHost 83.246.3.34:80>
  ServerName www.domain.com
  DocumentRoot /www/domain
  </VirtualHost>
  <VirtualHost 83.246.3.34:80>
  ServerName www.domain.com
  DocumentRoot /www/otherdomain
  </VirtualHost>
... when a connection is made to www.domain.com resoults in going to 83.246.3.34 port 80
Then Apache doesn't know where to go (/www/domain or /www/otherdomain) so it will go to the first definition
Aug 25 14:11:57 myserver com.apple.launchd[1] (org.apache.httpd[37310]): Exited with code: 1
Aug 25 14:11:57 myserver com.apple.launchd[1] (org.apache.httpd): Throttling respawn: Will start in 10 seconds
This means "Apache process exit with errors, will try to restart it in 10 sec".
Note that previous errors should not make Apache process die.
Aug 25 14:11:58 myserver servermgrd[36879]: servermgr_web: waiting for pid, file /private/var/run/httpd.pid.
Aug 25 14:12:02 myserver servermgrd[36879]: servermgr_web: Cannot confirm Apache was started; missing or invalid pid file
The ".pid" file is just a text file with the process number in it (in this case, 36879).
This file helps other process to kill or restart the Apache's process if needed.
That say that "no .pid file was created, or invalid file was created, for example an empty one".
Stop the Web Server and check that the .pid file is not there (/private/var/run/httpd.pid).
Start the Web Server and check that the .pid file is there and has the propper content.
You can get the PID (Process ID) for a process performing a "ps" command from the command line:
#ps aux | grep http
make the force b with u!