How to Fix the "Could Not Connect to the SolidNetWork Server" Error in SolidWorks

"Could Not Connect to the SolidNetWork Server" Error in SolidWorks

The Root of the Problem

The inability to connect to the SolidWorks license server (SolidNetWork License Manager) is usually caused by two main issues:

• Windows Firewall blocks: The default ports 25734 (TCP) and 25735 (UDP) are not enabled for inbound/outbound communication.
• Stopped service: The SolidWorks SolidNetWork License Manager service is not running on the central server.

Step-by-Step Guide to Resolving the Error

1. Check the Service Status on the Server

1. Open the SolidNetWork License Manager on the server (Start > SOLIDWORKS > SolidNetWork License Manager).
2. Go to the Administration tab and click Service/Server Status.
3. Confirm that the status is Running. If it is stopped, start the service with the Start Service button.

2. Configure Windows Firewall

On the server:

1. Open Windows Firewall with Advanced Security (search for wf.msc in the Start menu).
2. Click Inbound Rules > New Rule...
3. Select Port, then TCP, and enter 25734.
4. Allow the connection and give it a name (e.g., "SolidNetWork TCP").
5. Repeat the process for port 25735 (UDP).

Source: Official SolidWorks Documentation

On the client workstation:

Follow the same steps, but make sure to also enable outbound rules for both ports.

3. Force a Manual Connection

1. On the client, open SolidWorks Tools > SolidNetWork License Manager.
2. Click Modify in the License Server Selection section.
3. Manually enter the server's IP address and port using the format: 25734@[server_IP].
4. Click OK and restart the software.

Frequently Asked Questions (FAQs)

What should I do if the service doesn’t start on the server?

Verify that the license is correctly installed and that the server meets the minimum requirements. Try reinstalling the License Manager.

How can I tell if the ports are actually open?

Use the command telnet [server_IP] 25734 on the client (requires enabling Telnet Client in Windows Programs and Features).

Does this work on networks with VLANs?

Yes, but make sure traffic between VLANs isn't being blocked by additional switches or firewalls.