How do I fix: 🔍 Why This Happens?

The primary cause of this error is a mismatch between the session cookie and the CSRF token. This can happen when the user's browser or environment settings are not properly configured.Another possible cause is an issue with the Jupyter Notebook server itself, such as a misconfigured or outdated ver

How do I fix: 🚀 How to Resolve This Issue Clearing the session cookie?

Step 1: Close all Jupyter Notebook sessions and restart the kernel.Step 2: Delete any existing .ipynb_checkpoints files in the user's home directory.Step 3: Try running the script again, making sure to clear any cache or temporary files.

How do I fix: Checking Jupyter Notebook server configuration?

Step 1: Check if the Jupyter Notebook server is up-to-date and properly configured.Step 2: Verify that the CSRF token is enabled in the server settings.Step 3: Try running a simple script to test if the issue is specific to the long-running script.

Software⏱️ 3 min read📅 2026-06-03

How to Fix: Jupyter Notebook not saving: '_xsrf' argument missing from post

Jupyter Notebook not saving due to missing '_xsrf' argument in POST request.

Quick Answer: Try restarting the Jupyter Notebook server or using a different kernel.

📋 Table of Contents

🔍 Why This Happens
🚀 How to Resolve This Issue
🎯 Final Words

The 'Jupyter Notebook not saving: '_xsrf' argument missing from post' error occurs when Jupyter Notebook is unable to save changes due to an issue with the CSRF token.

This error affects users who are running long-running scripts in Jupyter Notebook, causing them to lose their progress and data.

🔍 Why This Happens

The primary cause of this error is a mismatch between the session cookie and the CSRF token. This can happen when the user's browser or environment settings are not properly configured.
Another possible cause is an issue with the Jupyter Notebook server itself, such as a misconfigured or outdated version.

🚀 How to Resolve This Issue

Clearing the session cookie

Step 1: Close all Jupyter Notebook sessions and restart the kernel.
Step 2: Delete any existing .ipynb_checkpoints files in the user's home directory.
Step 3: Try running the script again, making sure to clear any cache or temporary files.

Checking Jupyter Notebook server configuration

Step 1: Check if the Jupyter Notebook server is up-to-date and properly configured.
Step 2: Verify that the CSRF token is enabled in the server settings.
Step 3: Try running a simple script to test if the issue is specific to the long-running script.

🎯 Final Words

To resolve the 'Jupyter Notebook not saving: '_xsrf' argument missing from post' error, try clearing the session cookie or checking the Jupyter Notebook server configuration. If the issue persists, consider seeking help from a system administrator or IT support team.

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