Hello,
I'm testing in cloned VM upgrade process from Windows 2008 R2 Web Server to Windows 2012 Standard and everything during upgrade looks fine but after Win2012 startup I've noticed that my applicationHost.config file has been replaced with clean one (instead of many websites I see only Default Web SIte) and IIS informs me that there was some incompatibilites. Can someone point me direction where I should look for what has been incompatible? Since this is a clone VM for testing I've done some testing. I've copied old applicationHost.config file from C:\WIndows.old\..... directory and replaced one from Windows 2012, I've enabled World Wide Web Publishing Service (Automatically startup) and changed Windows Process Activaction Service startup status from Disabled to Manual. This allowed me to start IIS with all of my websites configured previously. I had a lot of rewrite.dll errors in event log and I've found this topic:
After repairing IIS URL Rewrite 2 installation I'm not getting any errors in Event Log -> Applications and websites looks like they are working fine. I don't know if I can make this kind of hack in real production system because I don't know exactly what changes has been made to applicationHost.config file so it would be nice to know where to look for this mentioned incompatibility in IIS 7.5 configuration so whole upgrade process should be done by Win 2012 upgrade installer. Can this be related to error with IIS URL Rewrite 2 module since this is the only one module which caused issues?
Regards
EDIT: I've reverted to pre update snapshot, removed completely IIS URL Rewrite 2 and after upgrading applicationHost.config file is still being replaced so this module is not cause if incompatibility.
EDIT2: I will try to remove also .NET 1.1 from 2008 and update again. Maybe this is the cause of incompatibility. If anyone know where to look for information what is causing this problem then I will be grateful for posting this information under this thread.
EDIT3: Removing .NET 1.1 before upgrade process didn't fixed incompatibility issue. There is also one more thing. When opening IIS Manager right after information about incompatibility there is link "Click here to view the latest IIS 7.0 compatibility information" which points to http://technet.microsoft.com/library/cc732976%28WS.10%29.aspx. Shouldn't this link be related to IIS 8 instead of 7?