How can I downgrade ASP.NET v4.0 to .NET 3.5 SP1?

We have purchased SOLARWINDWS ORION NPM and an engineer before me was not able to get it working properly. He was recently let go and I was moved into a junior engineering position. My first major project is to get this product up and running. I have been working with SOLARWINDS engineers and feel we have made progress, but there is still a web interface error when displaying details of a node. The SOLARWINDS engineer pointed out that we are running .NET 4 and that is not supported and recommended I downgrade to .NET 3.5 SP1. I thought this meant going to the CONTROL PANEL then PROGRAMS and FEATURES and removing the application there, but in there I see that .NET 3.5 is installed. The SOLARWINDS engineer was displaying .NET 4 by opening SERVER MANAGER and browsing to ROLES, IIS, THE SERVER IN QUESTION, then highlighting APPLICATION POOLS. There ASP.NET v4.0 is displayed. How can I get that back to .NET 3.5 SP1. Is this something totally different from the .NET in PROGRAMS and FEATURES? All assistance is appreciated.  Thanks
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Thor2923Asked:
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Carl TawnConnect With a Mentor Systems and Integration DeveloperCommented:
In the place where the engineer showed you that it was running .net 4, you should be able to change that to 2.0 (which is the same as 3.5 as far as IIS configuration is concerned).
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Thor2923Author Commented:
If anyone can also explain the difference between ASP.NET and the . NET in programs and features, I would appreciate it
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Thor2923Author Commented:
is that a right click thing? I am not sure where to change it
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Carl TawnConnect With a Mentor Systems and Integration DeveloperCommented:
Actually, wrong place. If you browse to your website in IIS, right-click on the website and choose Properties. The switch to the tab named "ASP.Net"; on there should be a dropdown that will let you change the .Net version that the website targets.
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pcsmitpraCommented:
What is the version of SOLARWINDWS ORION NPM you are using?
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Thor2923Author Commented:
10.0....I have been told that is the most stable...I know the engineer before tried 10.1 and had nothing but problems
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pcsmitpraConnect With a Mentor Commented:
Hello

For Orion NPM Version 10.1, it supports .NET 3.5 and above. And as .NET Framework 4 works side by side with older Framework versions. It should work. Probably you need to choose the asp.net 2.0 version for the website.

Thank you
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pcsmitpraCommented:
Please try to change the version of asp.net on website, IIS -> Website -> properties-> ASP.NET -> Select ASP.NET 2.0 there. Press Apply -> Ok . Also check Web Service Extensions , it should be enabled for asp.net 2.0.
Then restart the application pool for that website or IIS by iisreset command.
Launch the application, incase you still see the error .. Please paste the error here.
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Thor2923Author Commented:
and on the comment above.....about "browsing to your website in IIS"...I have IIS 7 open on a windows 2008 standard server. I see the SERVER NAME and below that is APPLICATION POOLS and SITES. I click the + next to SITES and see DEFAULT WEB SITE, SOLARWINDS NETPERFMON, SOLARWINDS ORION NETWORK CONFIGURATION.
I am assuming the website I am looking for is going to be under SOLARWINDS NETPERFMON, but I do not see any place to right click to get a drop down menu to change .NET. Do you know if I should drill down deeper? I do not see a PROPERTIES option on anything I right click.
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Carl TawnSystems and Integration DeveloperCommented:
Oh, ok, bit different for IIS 7.

Click on your site, then on the "Actions" panel click "Basic Settings". In that dialog will be a value called "Application pool", make a note of it.

Close the dialog, the click "Application Pools" in the left hand panel. Find teh application pool you found against the website. Right-click on it and choose "Basic Settings". In the Framework Version dropdown, select ".NET Framework v2.0.50727"
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Thor2923Author Commented:
both experts were helpful
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