> For the complete documentation index, see [llms.txt](https://docs.devolutions.net/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.devolutions.net/server/knowledge-base/troubleshooting-articles/cryptographicexception-bad-data.md).

# CryptographicException - Bad Data

The error `CryptographicException - Bad Data` in Devolutions Server is caused by an invalid session key. To fix this error message, please clean the browser's local storage.

The following instruction are the steps to do in the Google Chrome browser.

1. Open a Google Chrome browser page.
2. Open the Google Chrome Console by pressing the F12 key.

   <figure><img src="https://cdnweb.devolutions.net/docs/docs_en_kb_KB4759.png" alt=""><figcaption></figcaption></figure>
3. Select ***Application*** in the console's top menu.

   <figure><img src="https://cdnweb.devolutions.net/docs/docs_en_kb_KB4760.png" alt=""><figcaption></figcaption></figure>
4. Select ***Local Storage*** in the console's left menu.

   <figure><img src="https://cdnweb.devolutions.net/docs/docs_en_kb_KB4761.png" alt=""><figcaption></figcaption></figure>
5. Right click your site(s) and click ***Clear*** to delete the local storage.

   <figure><img src="https://cdnweb.devolutions.net/docs/docs_en_kb_KB4762.png" alt=""><figcaption></figcaption></figure>


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