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.
Cause. This issue may occur if the TCP port that is used by the VPN connection is already being used by another program. The VPN connection uses TCP port 1723 to establish a connection. If another program is already using this port, you cannot establish a VPN connection.
How do I fix Error 633 The modem is already in use?
Fixed: Error 633 The modem (or other connecting device) was previously in…
- Solution 1: Install all unnecessary Internet devices and programs. 2.
- Solution Turn off your Internet connection and then turn it back on. 3.
- Solution Update Network Adapter Driver.4.
- Solution Uninstall (then reinstall) your own network adapter.
How do I fix Error 633 on my modem?
Fixed: Error 633 The modem (or other connecting device) is currently in…
- Installing Solution 1: All and what unnecessary programs for Internet devices.
- Disabling Solution 1: Then re-enable interactive connection.
- Updated Solution 3: Your network adapter drivers.4:
- Solution Uninstall (then reinstall) the network adapter.
Why do I get VPN error 633 in Windows 10?
In short, VPN error 633 Windows 10 occurs when the VPN communication port is already in use, no doubt due to a perfect Windows Creators Update or due to outdated modem drivers. Today we noticed the methods used by our VPN support engineers to fix this error. Easy Solution for VPN Error 429!!
How do you fix error 633 on Iphone?
Help me please!
- Remedy “Error 633: The hub is already in use, it may not be configured correctly”
- Start the Registry Editor.
- Reserve the TCP port.
- Update/reinstall your modem drivers.
- Prevent websites, ISPs, added users, and parties from tracking you.
- Recover lost files quickly for your family .
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What is the Error code 633?
Many users have reported device error 633. This error indicates that your PC is not set up correctly. This error can occur if the communication port controlled by your modem has used redundancy art through other software. Error 633 also occurs when setting up multiple Internet connections.
Which has failed the error code returned on failure is 633?
The message “Error 633: The modem is already in use or configured incorrectly” is not device-specific, so any make and model of PC can still be affected. The error message explicitly states that the cable box is not working due to a misconfiguration.

Vijay is a tech writer with years of experience in the Windows world. He’s seen it all – from simple problems to catastrophic system failures. He loves nothing more than helping people fix their PCs, and he’s always happy to share his wisdom with anyone who needs it.
When Vijay isn’t fixing Windows problems, he likes to spend time with his wife and two young children. He also enjoys reading, playing cricket, and watching Bollywood movies.