IIS and Apache both on Port 80
IIS takes up all IP adresses by default.
Use programm httpcfg ( part of MS 2003 support tools) to solve the problem
net stop http /y
net stop w3proxy
httpcfg delete iplisten -i 0.0.0.0
httpcfg set iplisten -i xx.xx.xx.xx
net start http
net start w3svc
net start w3proxy