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.
Verify that your SolidWorks client knows exactly where to look for its license:
: Uncheck "Prevent any program from modifying the HOSTs file." Zone Alarm : In Advanced Settings, uncheck "Lock Hosts File." Remove Read-Only Attribute Navigate to C:\Windows\System32\drivers\etc Right-click the file and select Properties Extension Check : Ensure the file is named exactly with no extension. It should not be How to Manually Edit the Hosts File solidworks host file block fix
Here is the to fix or implement the block.
If SolidWorks fails to activate with a message about firewall issues, server unavailability, or "invalid license," it is likely a blocked connection. If you continue to experience issues after verifying
Look for any lines containing words like solidworks , 3ds , flexlm , or activation . Examples of problematic lines include: 127.0.0.1 ://solidworks.com 127.0.0.1 lmlicenses.wibu.cloud
: On a new line at the bottom, type the IP Address , then a Tab space, then the Server Name . Example: 192.168.1.100 PDMServerName . If SolidWorks fails to activate with a message
We will fix this using three escalating levels of intervention. Start with Method 1 and proceed only if it fails.
In the context of SOLIDWORKS, "fixing" the host file typically refers to resolving connectivity issues between a client machine and a server (such as PDM or License servers) by manually mapping IP addresses to server names. This is often used as a short-term workaround when DNS resolution fails. Troubleshooting Host File Blocking & Connectivity
Look for lines containing domains like ://solidworks.com or ://solidworks.com . Delete these entire lines to unblock the connection.
Network licenses require constant communication with a local or cloud-based license server manager.