Change IIS to 64bit mode

Posted on 2010-09-10
Last Modified: 2012-06-27

I am trying to install Exchange 2010. Therefore, the installer says that I have to change the IIS to 64bit mode.

I am already running 2 websites on IIS, can I change IIS to 64bit easely without messing up my websites?

How do I do it?

Question by:Ruttensoft
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LVL 29

Accepted Solution

QPR earned 500 total points
ID: 33644093

Author Comment

ID: 33644098
Thanks, I found that too, but will it affect my current 2 websites?
LVL 29

Expert Comment

ID: 33644125
I don't see how it could. Do you have any 32/64 bit code/threading on these sites?
To be doubly doubly safe you could take a system restore and roll back in anything weird happened

Expert Comment

ID: 33644135
It should not effect your 2 website for safely take a system restore as recommended by QPR
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Author Comment

ID: 33644240
Fortunately I did...

Both websites dont run anymore :-/

What I did was:

cscript %SYSTEMDRIVE%\inetpub\adminscripts\adsutil.vbs SET W3SVC/AppPools/Enable32bitAppOnWin64 0

// Uninstalling 32bit
%SYSTEMROOT%\Microsoft.NET\Framework\v2.0.50727\aspnet_regiis.exe -u
%SYSTEMROOT%\Microsoft.NET\Framework\v4.0.30319\aspnet_regiis.exe -u

// Installing 64bit
%SYSTEMROOT%\Microsoft.NET\Framework64\v2.0.50727\aspnet_regiis.exe -i
%SYSTEMROOT%\Microsoft.NET\Framework64\v4.0.30319\aspnet_regiis.exe -i

What did I do wrong?

LVL 29

Expert Comment

ID: 33644264
When you say don't run anymore... what do you get?
Can you create a simple site with either an html or apsx file and serve that up?

What are the sites created in? asp/aspx/php/static html?
Any Db connections?

Have you run an iisreset from the command prompt to be sure iis restareted?

Author Comment

ID: 33644322
Thanks for your patience

I am getting http 500 errors on both sites.
The sites are aspx with sql server connections
IISReset performed...
Created a new site with a simple index.html but I am getting the same error there...


Author Comment

ID: 33644331
This is the error message:

Fehler beim Aufrufen von "LoadLibraryEx" für den ISAPI-Filter "C:\Parallels\Plesk\isapi\sitepreview.dll". (german)

Means something like "Error while loading "LoadLibraryEx" for the ISAPI-Filter "C:\Parallels\Plesk\isapi\sitepreview.dll"

=> Plesk is installed, is Plesk not compatible with x64?

Author Comment

ID: 33644369
Ok, its working now.

Plesk has registered a non-64bit-compatible ISAPI Filter for generating Site-Previews. As I dont need this feature, I just removed the SitePreview-DLL as ISAPI-Filter.


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