Solidworks Host File Block Fix [ Easy — SUMMARY ]

To help narrow down any remaining connection or activation issues, please let me know:

Manually map the server's IP to its name in the hosts file ( C:\Windows\System32\drivers\etc\hosts ) to bypass the DNS lookup.

By redirecting domain names to a non-existent or local IP like 127.0.0.1 (your own computer), the file prevents SOLIDWORKS from contacting its license servers, disabling automated checks and error reporting.

: Delete these lines or add a # at the beginning of the line to comment them out. Save the file and restart SOLIDWORKS. 3. Check Firewall Outbound Rules solidworks host file block fix

The "host file block fix" is a common workaround used in SOLIDWORKS PDM to resolve connectivity issues when a client machine cannot communicate with the server due to DNS resolution failures. This process involves manually mapping the server's IP address to its name in the Windows hosts file to bypass the network's DNS. You should apply this fix if you encounter errors such as: "Ping request could not find host".

Scroll to the very bottom of the file. Start a new line beneath any existing text. Enter the local loopback IP address ( 127.0.0.1 ), press the Tab key, and enter the target licensing domain.

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Standalone validation fails despite an active internet connection.

: Ensure TCP ports 25734 and 25735 are open for both Inbound and Outbound rules on both the server and client machines.

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. Save the file and restart SOLIDWORKS

Click , then choose New Rule on the right side. Select Port and click Next.

Fixing a SolidWorks host file block requires locating the file, clearing out incorrect entries, and ensuring your firewall plays nice with the SolidWorks Licensing Service. Understanding the Host File Block