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Have a look here first: http://stackoverflow.com/questions/5349867/error-handling-in-asp-net-mvc3

Update: if it doesn't help - read this discussion (especially the last post on page 2): http://forums.asp.net/t/1657582.aspx/2/10?Error+500+0+when+MVC+runs+on+IIS7

Update 2: This one looks very promissing too: http://forums.asp.net/t/1652026.aspx/1

remove <add verb="POST,GET" path="ajax/*.ashx" type="Ajax.PageHandlerFactory, Ajax" /> from httpHandlers

and add <add verb="POST,GET" name="scripthandlerajaxFactory" path="ajax/*.ashx" type="Ajax.PageHandlerFactory, Ajax" /> to handlers

Have a look here first: https://stackoverflow.com/questions/5349867/error-handling-in-asp-net-mvc3

Update: if it doesn't help - read this discussion (especially the last post on page 2): http://forums.asp.net/t/1657582.aspx/2/10?Error+500+0+when+MVC+runs+on+IIS7

Update 2: This one looks very promissing too: http://forums.asp.net/t/1652026.aspx/1

remove <add verb="POST,GET" path="ajax/*.ashx" type="Ajax.PageHandlerFactory, Ajax" /> from httpHandlers

and add <add verb="POST,GET" name="scripthandlerajaxFactory" path="ajax/*.ashx" type="Ajax.PageHandlerFactory, Ajax" /> to handlers

Have a look here first: http://stackoverflow.com/questions/5349867/error-handling-in-asp-net-mvc3

Update: if it doesn't help - read this discussion (especially the last post on page 2): http://forums.asp.net/t/1657582.aspx/2/10?Error+500+0+when+MVC+runs+on+IIS7

Have a look here first: http://stackoverflow.com/questions/5349867/error-handling-in-asp-net-mvc3

Update: if it doesn't help - read this discussion (especially the last post on page 2): http://forums.asp.net/t/1657582.aspx/2/10?Error+500+0+when+MVC+runs+on+IIS7

Update 2: This one looks very promissing too: http://forums.asp.net/t/1652026.aspx/1

remove <add verb="POST,GET" path="ajax/*.ashx" type="Ajax.PageHandlerFactory, Ajax" /> from httpHandlers

and add <add verb="POST,GET" name="scripthandlerajaxFactory" path="ajax/*.ashx" type="Ajax.PageHandlerFactory, Ajax" /> to handlers

Have a look here first: http://stackoverflow.com/questions/5349867/error-handling-in-asp-net-mvc3

Have a look here first: http://stackoverflow.com/questions/5349867/error-handling-in-asp-net-mvc3

Update: if it doesn't help - read this discussion (especially the last post on page 2): http://forums.asp.net/t/1657582.aspx/2/10?Error+500+0+when+MVC+runs+on+IIS7