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Latest Troubleshooting Guides

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Troubleshooting

How to Remove a Host Key from SSH Known Hosts

SSH warns or fails when a remote host's key changes—common after server rebuilds, IP reassignment...

Troubleshooting

How to Fix PuTTY SSH Connection Refused Error

You open PuTTY, enter your server's IP and port, click Open, and get "Connection refused"...

Troubleshooting
Fix Microsoft Teams Stuck on Loading Due to Network Firewall

You launch Microsoft Teams, but it gets stuck on the loading screen with no error message. One co...

Troubleshooting
Fix Jupyter Notebook Token Not Working on Ubuntu

You launch Jupyter Notebook on Ubuntu, but when you open the URL in your browser, the token promp...

Troubleshooting
Fix Jupyter Kernel Not Starting on Windows 10

When you launch a Jupyter notebook and the kernel never starts—or shows a 'Kernel error' or 'Conn...

Troubleshooting
How to Fix MongoDB Authentication Failed Error

You try to connect to MongoDB and get AuthenticationFailed or MongoError: Auth...

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