Licensing error -17 (BricsCAD cannot connect to the network license server)

Symptoms

BricsCAD displays error -17 when attempting to connect to the Network License Server.

Possible causes:

Firewalls, proxy servers, anti-virus software and other security measures can block the ports used by the Network License Server.
The Network License Server is down.

First, make sure that the BricsCAD computer:
- Is on the same Local Area Network (LAN) with the Network License Server, either physically or via VPN.
- Is able to communicate with the Network License Server on port 5053 and the ISV port over TCP/UDP.
Then test the connection between the BricsCAD computer and the network license server. Open a Windows PowerShell terminal and run:
```
Test-NetConnection -computername <SERVERNAME> -port <NUMBER>
```
Note: Adapt and insert the line above for port 5053, then repeat it for the ISV port. On both lines, replace <SERVERNAME> with the server name and <NUMBER> with the specific port number.

If the connection fails, you need to open port 5053 and the ISV port. For more information, see the Advanced configurations article.
Make sure the anti-virus software is not blocking the RLM service on the Network License Server.
If there is a proxy server between the BricsCAD computer and the Network License Server create the following system variable(s):
- HTTP_PROXY=server:port
- (optionally) HTTP_PROXY_CREDENTIALS=username:password if the proxy server supports basic authentication.