Network installations use the SolidNetWork License Manager and require the correct port (usually ) to be open in the firewall.
If you have cleaned your Hosts file and flushed your DNS, but SolidWorks still fails to activate, look into these secondary barriers: 1. Check Local Windows Firewall Settings
If the above methods don't resolve the issue, try the following:
Navigate to the following path: C:\Windows\System32\drivers\etc\ . solidworks host file block fix
To block SolidWorks from accessing the internet (often done to prevent license servers from communicating externally or to stop the "SolidWorks Network License Manager" from reaching the master server), you need to modify the Windows hosts file.
SolidWorks Host File Block Fix: A Step-by-Step Guide SolidWorks relies on secure connections to its licensing servers to verify your software seat. Sometimes, Windows changes or third-party security software modify your system host file. This can block SolidWorks from checking its license, leading to activation failures, connection time-outs, and startup crashes.
If you are using a floating network license (SNL) in a corporate environment and your DNS is failing to resolve the license server's name, you can use the hosts file to manually route it. Go to the bottom of the file. To block SolidWorks from accessing the internet (often
Click , then choose New Rule on the right side. Select Port and click Next.
Below is the comprehensive guide to diagnostic procedures, file permission management, and step-by-step resolution scripts. Why SolidWorks Experiences Host Block Errors
The Hosts file is a plain text file in your Windows operating system that maps hostnames to IP addresses. It acts like a local phonebook for your computer, overriding the standard Domain Name System (DNS) lookup. While it's a useful tool for network administrators, it can be disastrous for software validation. This can block SolidWorks from checking its license,
The Hosts file is a powerful tool for troubleshooting network issues in SOLIDWORKS PDM environments, but it is also a frequent source of licensing failures if misconfigured. By following the steps to reset the file, ensuring no anti-piracy patches are present, and adjusting your security software permissions, you can resolve most activation and installation errors.
: At the bottom of the file, add a new line with the server's IP address, a tab or space, and then the server name. 192.168.1.50 MyPDMSERVER Save and Flush DNS : Save the file, then open a Command Prompt and type ipconfig /flushdns to apply the changes immediately. GoEngineer 2. Resolving "Access Denied" or Blocked Changes If you cannot save the file or it keeps resetting, check these common blocks: Antivirus Interference : Security software like SentinelOne often locks the file to prevent malware.