I'm using mod_proxy to redirect requests of several sub domains of main one to corresponded servers running on the LAN. Long story short here is my config:
ProxyRequests off
<VirtualHost 0.0.0.0:80>
ServerName sub1.dev.enterprise.com
ProxyPass / http://localhost:8888/
ProxyPassReverse / http://localhost:8888/
</VirtualHost>
<VirtualHost 0.0.0.0:80>
ServerName sub1.dev.enterprise.com
ProxyPass / http://sub1.dev.enterprise.com:8080/
ProxyPassReverse / http://sub1.dev.enterprise.com:8080/
</VirtualHost>
After Apache restart any request for .dev.enterprise.com/ ends up on http://localhost:8888/ Why so?
You have the same ServerName in both config sections.
Try running "apache2ctl -t" (debian syntax, but other distributions should have a similar command) to test your config. Apache will also tell you about such obvious mistakes in its logfile.
Btw.: Do not forget to set NameVirtualHost when using VirtualHost.