The MathWorks installer will try to automatically inherit your computer's proxy settings on Windows. The following error indicates the network proxy is being injected into the MathWorks installer, preventing the installer from contacting the MathWorks server. To configure the proxy setting, please refer to the article below:
Note: You may need to contact your IT Help Desk if your organization is running a network firewall/proxy to configure it to bypass blocked connections to the MathWorks servers.
Why do I get a connection error when installing or activating MATLAB or another MathWorks product?
If the MathWorks installer is still unable to connect after troubleshooting your proxy and firewall, you may install MATLAB using the offline workflow:
How can I install MATLAB or other MathWorks products on an offline machine?
If you are still having issues with the installation, submit a service request using the link below. Please include the troubleshooting steps you took to resolve the connection issue and include your installation log file. See this related article if you need assistance locating your log file:
Where are the MATLAB Installation and Activation log files located?