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Pokud chcete používat Apache a IIS současně, je třeba změnit konfiguraci IIS v metabase tak, aby se nebindoval na všechny IP adresy, které jsou k dispozici. Je to totiž defaultní chování Windows IIS.
Vypnout jej můžete následujícími příkazy z command promptu:

cd C:\InetPub\AdminScripts
CSCRIPT ADSUTIL.VBS SET W3SVC/DisableSocketPooling TRUE
iisreset

po restartu IIS se přesvěčte že jsou všechny weby funkční a nepoužívají All available, melo by to byt OK.

Na windows 2003 serveru je to však všechno jinak:
To install Microsoft Windows support tools
1. Insert the Windows Server 2003 CD in the CD-ROM or DVD-ROM drive.
2. When the CD opens, click Perform Additional Tasks.
3. Click Browse this CD.
4. Double-click Support.
5. Double-click Tools.
6. Double-click SUPTOOLS.MSI.
7. Click Next, type your information in the Name and Organization boxes, click Next, and then click Next on the following screen.
8. Click Next again to start the installation.
9. Click Finish.

To add an IP address to the IP inclusion list
1. Click Start, and then click Run.
2. Type cmd, and then click OK to open a command prompt.
3. Type the following, where xxx.xxx.x.x is the IP address you want to add:

httpcfg set iplisten -i xxx.xxx.x.x
When this succeeds, Httpcfg returns the following:
HttpSetServiceConfiguration completed with 0

To view additional status codes, see the Httpcfg help.
4. After the IP address is added, use the following command to list it:
httpcfg query iplisten
Httpcfg returns the following:
IP :xxx.xxx.x.x
5. From the command prompt, stop the HTTP service and its dependent services. To do this, type the following string at the command prompt:
net stop http /y
6. From the command prompt, restart the HTTP service and it dependent services. To do this, type the following string at the command prompt:
net start w3svc
Note When you start w3svc, all services that were stopped when HTTP was stopped will start.

další info na MS