This error indicates that your modem is not configured properly. Error 633 affects all modem model and isn’t connected to any specific device. Here’s how one user describes this issue: This error may occur if the communication port used by your modem has been reserved by another software program. Error 633 also occurs when users set up multiple internet connections. If error 633 is blocking your Internet connection, follow the troubleshooting steps listed below.
How do I fix Error 633: The modem is already in use or not configured properly?
Solution 1 – Run the built-in troubleshooter
The first step is a rather simple one. With Windows 10, Microsoft sorted out a bit messy troubleshooting options. Now there’s the unified menu within Settings where all troubleshooting tools reside. You can find it in Settings, under the Update & Security section. Among others, there are Network Adapter Troubleshooter and Internet Connections Troubleshooter which should come in handy when errors like this occur. Follow these steps to run the Network Adapter Troubleshooter:
Solution 2 – Update your modem drivers
Download and install the latest drivers for your modem from the manufacturer’s website. You can also use the Device Manager to update your drivers:
Solution 3 – Uninstall and reinstall your modem drivers
If updating your modem’s drivers didn’t eliminate error 633, try uninstalling and then reinstalling them.
Solution 4 – Reserve the TCP port
If you’ve found other workarounds to fix modem error 633, feel free to list the troubleshooting steps in the comment section below!
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