Disclaimer: This guide is intended for resolving issues on legally licensed installations of SolidWorks. Modifying the hosts file to bypass licensing mechanisms is against the terms of service.
If you continue to experience issues after verifying the Hosts file, it is recommended to perform a clean uninstallation of the license manager and contact your official SolidWorks reseller or the team for assistance.
When your network's DNS server cannot translate a name like "Server01" into its IP address. VPN/Remote Work:
: Slow response times when checking files in or out of a PDM vault. solidworks host file block fix
Type the following command to clear old routing data and press Enter: ipconfig /flushdns Restart SolidWorks. Alternative Solutions to Persistent Licensing Issues
SOLIDWORKS "hosts file block" typically refers to an error where the installer or software cannot write to the Windows hosts file, often due to aggressive antivirus settings or a read-only attribute. This is also a common workaround used to resolve SOLIDWORKS PDM
Before you can fix the issue, you must understand the battlefield. The hosts file is a plain text file found in every operating system (Windows, macOS, Linux) that maps hostnames to IP addresses. Think of it as a local, manual GPS override for your internet traffic. Disclaimer: This guide is intended for resolving issues
Ensure your Windows Firewall is not blocking sldworks.exe .
SolidWorks uses this file to communicate with the and PDM servers. When your computer searches for the license server, it first checks the Hosts file. If the file contains incorrect entries (e.g., redirecting the license server to 127.0.0.1 ), SolidWorks won't be able to find it, resulting in activation failures.
(no entry)
In this 2,500+ word guide, we will dissect exactly what the Hosts file does, why SolidWorks modifies its behavior regarding it, the step-by-step fix, and—most importantly—how to prevent this from happening during a critical deadline.
Users may experience the following symptoms:
Now that the block is removed, try activating SolidWorks again. Open . Navigate to Help > Licenses > Activate . Try the activation process again. Troubleshooting: What if it's not the Hosts File? When your network's DNS server cannot translate a