The error 633 denotes that the port is already in use or is not configured for Remote Access dial out. You may have to check if the VPN and dial out connection are trying to use the same port that is causing the issue. You may have to check the settings for the modem and change the port for your requirements.
How do I fix Error 633 The modem is already in use?
Fixed: Error 633 The modem (or other connecting device) is already in…
- Solution 1: Install arbitrary and irrelevant Internet trackers.
- Solution 2: Disable and then re-enable your network connection
- Solution 3: Update your cell tower network drivers.
- Solution 4: Uninstall (and reinstall) the service adapter.
How do I fix Error 633 on my modem?
Fixed: Error 633 Modem (or alternative connection device) is already connected…
- Solution 1: Install any unnecessary internet applicator programs.
- Solution 2: Disable and re-enable your network connection.
- Solution 3: Update your network adapter. drivers.
- Solution 4: (and uninstall and then reinstall) network adapter.
Why do I get VPN error 633 in Windows 10?
In rare cases, VPN error 633 in Windows 10 mostly occurs when the VPN communication port is already in use, paid for Windows Creators Update, or even due to outdated modem drivers. Today we saw the methods that our VPN support engineers always use to troubleshoot specific errors. Fixing VPN error 429 is easy!
How do you fix error 633 on Iphone?
Help me please!
- Remedy “Error 633: The modem is already in use, that is, incorrectly configured”
- Start the Registry Editor.
- Reserve a TCP port.
- Update/reinstall your modem drivers.
- Protect websites, ISPs, and others from being scammed.
< li>Recover lost files quickly.
What is the Error code 633?
Many users have reported modem error 633. This error indicates that your modem is not configured correctly. This error can also occur if the communication port previously used by your modem has been suggested by other software. Error 633 sometimes occurs when users set up multiple Internet connections.
Which has failed the error code returned on failure is 633?
“Error 633: The modem is currently in use or not properly configured” is not device-specific, so any make and model of PC can be affected. The error message explicitly states that experts claim that the modem is malfunctioning due to incorrect settings.

Ermias is a tech writer with a passion for helping people solve Windows problems. He loves to write and share his knowledge with others in the hope that they can benefit from it. He’s been writing about technology and software since he was in college, and has been an avid Microsoft fan ever since he first used Windows 95.