IIS 6 Error - Port in use when binding a wildcard SSL to multiple sites

Port in use error occurs when 443 is set as SSL port on multiple site in IIS 6.

CAUSE:
SecureBindings metabase property is not set.

SOLUTION:
Run the following from cmd:

C:\Inetpub\AdminScripts\cscript.exe adsutil.vbs set /w3svc/SITEIDENTIFIER/SecureBindings ":443:HOSTHEADER"

where SITEIDENTIFIER and HOSTHEADER are replaced.


SOURCE:
http://www.sslshopper.com/article-how-to-configure-ssl-host-headers-in-iis-6.html