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Issue when refreshing site

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Posted on by CT-19030932-0

Hi all,

We have an odd issue with Power Pages site. It is using Entra ID via OpenID Connect and users are manually provisioned into the contacts and external identity tables.

Randomly, when users refresh the page, they're presented with a 'Something went wrong' page. The error message is 'Value cannot be null. Parameter name: value' and the full error seems related to cookies.

We have found clearing the cookie ‘.AspNet.ApplicationCookie’ (or all if there are multiple) will restart the session and clear the error.

Is there anything I can check to diagnose this?

Many thanks

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Inogic 1,258 Moderator on at

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Hi,

This usually happens because of a cookie or session issue with the Entra ID login.

The error “Value cannot be null” typically means the authentication cookie has become invalid or expired, which is why clearing the .AspNet.ApplicationCookie fixes the problem.

You can try checking a few things: make sure your OpenID Connect settings are correct, see if multiple cookies are getting created (sometimes due to domain or subdomain differences), and review cookie settings like SameSite and Secure. It’s also worth checking if there’s any mismatch between session timeout and token expiry.

If this started suddenly, it could also be due to a recent platform update. You can use browser developer tools to inspect cookies when the issue occurs.

Hope this helps!

Thanks!

Inogic

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