1. Open Windows Defender Firewall with Advanced Security
2. Select New Rule..
3. Select Program and click Next..
4. Input this link to the textbox. C:\Program Files (x86)\CardExchange Solutions\CardExchange Gateway\CardExchange.Gateway.exe

5. Select Allow the Connection..
6. Select Domain, Private and Public then click Next..
7. Name the Rule "Allow CardExchange" then click Finish.