c# Identity Server Bad Request - Request Too Long

Question

I have an odd issue that I am trying to track down.

If I deploy my client and Identity Server to Azure, using a self signed certificate then the code works.

Answer 1

I've had this issue recently. The solution was to downgrade the used NuGet package Microsoft.Owin.Security.OpenIdConnect. I was using 3.0.1. You must downgrade to 3.0.0. This is an issue with Owin/Katana middleware. Descriptioin of the issue can be found here. Note that the page states how to fix the actual issue in the library. I haven't tried that, it could also work and is worth the try.

Note that you must clear your cookies the first time you redeploy with the fix in place. As temporary fix, you can always clear your cookies, and just visit the site again. At some point however, it will always stick bunch of nonce strings in the cookie. Similar issue can be found here.