By default, the Zscaler service "listens to" port 80 for HTTP traffic, port 443 for HTTPS traffic, port 53 for DNS traffic, and port 21 for FTP traffic. If your organization uses other ports or additional ports for HTTP, HTTPS, DNS, or FTP traffic, you can configure the Zscaler service to use custom ports for these services. Do the following:
- Create a custom service with the appropriate ports.
- Configure the service to accept HTTP, HTTPS, DNS or FTP traffic from the ports assigned to the custom service that you created.
To configure the Zscaler proxy service to accept HTTP, HTTPS and DNS traffic from custom ports, follow the instructions below.
- Go to Administration > Settings > Advanced Settings and complete the following:
- Services Forwarded to HTTP Web Proxy
From the HTTP Services and HTTPS Services lists, choose the custom service that specifies the ports your organization uses for HTTP and HTTPS.
- Services Applicable to DNS Transaction Policies
From the DNS Services list, choose the custom service that specifies the ports your organization uses for DNS traffic.
- Services Applicable to FTP Proxy
From the FTP Services list, choose the custom service that specifies the ports your organization uses for FTP traffic.
- Click Save and activate the change.
- You can view and edit more advanced settings if necessary.