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Hosting ASP.NET 4.0 on IIS6 (2003) vs IIS7 (2008)

Is there any disadvantage to hosting asp.net 4.0 Web apps on a 2003 server with IIS6?

It seems that all commercial hosting providers are offering 2008 IIS7 for the .net 4.0 sites, however we will be hosting our web sites internally on our own web server (currently 2003 IIS6) and my manager is keen for me to justify the cost of upgrading to 2008 IIS7.  

So I really want to understand whether it can be justified and why, we currently connect to sql which is on a 2003 server and that is unlikely to be upgraded in the forseeable future - so this should be taken into consideration.

If I have omitted a vital piece of info do please ask, many thanks in advance for the advice.




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forsters
Asked:
forsters
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2 Solutions
 
richard_hughesCommented:
Hello forsters

.NET 4 can work with IIS 6 (as can be seen here: http://johan.driessen.se/archive/2010/04/13/getting-an-asp.net-4-application-to-work-on-iis6.aspx)

You are always best to upgrade to IIS 7 or IIS 7.5 as you will have the maximum level of support and future support. Most tutorials and setup guides will use IIS 7 now days too. But IIS 6 should not be ruled out if cost is a priority.

Thank,

Richard Hughes
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forstersAuthor Commented:
Hi Richard,

Thanks for your comment, good point re. the support, having spent a good chunk of the day googling IIS I can confirm that the information has already moved onto 7 or indeed 7.5.
I was also concerned that some of the .NET 4 features may be incompatible with IIS6, reducing the advantage of the latest release but there seems only to be vague indication, no hard facts, can you enlighten me at all on this?
Be grateful for any further comment, otherwise many thanks for the guidance.
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richard_hughesCommented:
There are big differences in how IIS 6 and IIS7/7.5 handle .NET

See the following links for some examples:

http://world.episerver.com/Documentation/Items/Tech-Notes/EPiServer-CMS-5/EPiServer-CMS-5-R2/Changes-Between-IIS6-and-IIS7/
http://arcware.net/use-a-single-web-config-for-iis6-and-iis7/
http://stackoverflow.com/questions/939733/difference-between-iis-6-0-vs-iis-7-0

This isn't a massive problem, but your developers will have to keep the differences in mind.

Thanks,

Richard Hughes
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