jimthurston wrote:Hi there,
I realise this is an old post but I'm struggling with the same issue - every time I want to make any Alert configuration change, including resetting to Defaults, gives a 500 error and the logs give the same 'Value cannot be null' message. The web site is installed on Windows Server 2008 R2; the monitor database is installed on a separate machine, also running Windows Server 2008 R2, with SQL Server 2008 R2 (Standard). I have tried IE8 and Chrome; same issue with both.
Was a solution ever found? Did it relate to installing the database monitor on SQL 2008 R2? Might I be able to directly change the config in the database as a workaround?
Apologies for the late reply. We never found a solution to this issue no. Reading through the post again it looks like it could be an issue with 32 bit Windows 7 rather than SQL 2008 R2 but we can't be sure of this of course.