If a computer previously hosted an unauthorized version of the software, cracking scripts often write lines into the hosts file to intentionally block SolidWorks from contacting official activation servers (such as ://solidworks.com ). When you attempt to install a legitimate license later, these hidden blocks remain and prevent activation. Common Symptoms
"No internet connection detected" (when you clearly have one) Step 1: Locating the Windows Hosts File
: In Notepad, go to File > Open . Navigate to C:\Windows\System32\drivers\etc\ . Ensure the file type filter in the bottom right is set to All Files ( . ) so the extensionless hosts file appears. solidworks host file block fix
To fix the issue, follow these steps:
You should see a message confirming the DNS Resolver Cache was successfully flushed. Step 4: Verify SolidWorks License Manager Ports If a computer previously hosted an unauthorized version
The "SolidWorks host file block fix" is a relic of a bygone era. Attempting it today will likely result in software crashes, security breaches, and legal exposure—all for software that will probably revert to a 30-day trial mode anyway.
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. Navigate to C:\Windows\System32\drivers\etc\
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?
| Issue | Solution | | :--- | :--- | | | Ensure you run Notepad as an administrator. | | Can't Save Hosts File | Temporarily disable your antivirus to allow file access. | | SW Still Validates License | Double-check for typos in domain names, restart your PC, or flush DNS with ipconfig /flushdns in Command Prompt (Admin). | | Service/Dependency Issues | Clean old FlexNet services using sc delete SolidWorksFlexnetServer . For activation issues, delete files in the C:\ProgramData\FLEXnet folder. | | Errors in License Verification | Check the SolidWorks Flexnet Server service in services.msc . |
Open the from your Windows Start Menu. Navigate to the Server List tab.