Request Header too long

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Posted on by Elcee_Rick

Hello,

We're getting more and more users who cannot access our D365 FO production environment. They get HTTP Error 400 - The size of the requested headers is too long. This happens on any page, even on the home page of the environment. The issue will usually resolve itself after a random amount of time, but is quite annoying.

We usually try to clear cache and cookies and if that doesn't work we let users temporarily log in in an InPrivate session tab. But this cannot be a permanent solution.

Do you guys know how we can resolve this permanently?

Thanks!

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Alireza Eshaghzadeh 14,672 Super User 2025 Season 2 on at

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Hi Elcee,

Have you check following posts on Microsoft docs regarding the HTTP Error 400?

docs.microsoft.com/.../troubleshooting-http-400-errors-in-iis

docs.microsoft.com/.../

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