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DNN 9.2 login problems Parameter name: slidingExpiration Error

If you've recently upgraded an older DNN site to DNN 9.2, and experienced a login problem, resulting in an error that says

Specified argument was out of the range of valid values.

Parameter name: slidingExpiration

You're probably frustrated that you can't login and use your DNN site. If you're lucky, you still have a browser where you have a user logged in and able to access the site (I was lucky). 

I spent quite a bit of time trying to track down the problem and ultimately resorted in simply going line by line through the web.config file of my site and a clean DNN 9.2 instance to see what the differences were. I had a LOT of differences, the site I was having problems with has been running DNN for 10+ years, so it has gone through countless upgrades.

Ultimately this all came down to a change I made to the web.config years ago to allow for a user to remain logged in. 

<authentication mode="Forms">

      <forms name=".DOTNETNUKE" protection="All" timeout="100000" cookieless="UseCookies" />


The problem is that timeout value, I had it set at 100k, while the default in DNN 9.2 is 60. I changed that value to 60, uploaded the web.config to my site, and was able to successfully login. I then changed it to 10000 instead of 60, and I am still able to login and access the site. 

Hopefully this blog post will save you some headache!

Here's a thread discussing the issue in the forums.


Amer Soft
So brilliant how you could find out that reason, thank you very much, you have saved us many wasted working hours.
Amer Soft Monday, June 18, 2018 10:04 AM (link)
Rod Weir
Thanks Chris - this helped me.
Rod Weir Monday, November 26, 2018 8:28 PM (link)
Duncan Ion
Thanks for that... Very useful, and saved me a whole load of time.
Whilst it fixed this for me, I don't really understand why it would as changing it back to the original [in my case, 62500] should have reinstated the error??

Duncan Ion Saturday, February 9, 2019 7:37 AM (link)

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