Networking & ports
Coreza for Sharp makes use of various protocols and ports to enable printing. This document outlines the port, protocol, route, and reason for the ports.
Please use this information to configure firewalls or web application proxies that may otherwise block print traffic.
Required ports and routes
| Port and protocol | Destination | Reason / description |
|---|---|---|
| 443 (HTTPS) TCP | https://directprint.io/* https://*.directprint.io/* | To fetch configuration information from the Coreza for Sharp server and to report print events. All communication is via HTTPS (secure sockets) |
| 443 (HTTPS) TCP | https://www.googleapis.com/drive/v3/files | Only required when using the 'Edge printing' feature with Google Drive |
| 9100 TCP | Any printer on the local network. Required for local printing use-cases. | Port 9100 is the RAW printing port used by printers for the transfer of print jobs. The Coreza for Sharp client will use this port to communicate with your printers on the local network. |
| 631 TCP | Any printer on the local network. | Port 631 is the standard IPP (Internet Print Protocol) port used by printers for the transfer of print jobs. The Coreza for Sharp client will use this port to communicate with your printers on the local network. |
| 443 (HTTPS/IPPs) TCP | Any printer on the local network. | Port 443 is the standard HTTPS port, sometimes used to encrypt IPP print traffic. If the printer has IPPS (secure IPP) enabled it's likely to be using port 443. |
| 80 (HTTP) TCP | Any printer on the local network. | Port 80 is used by many printers for IPP. The requirement for this port to be routable will depend on your printer configuration. It is suggested to open this port, if possible. |
Web/HTTP/HTTPS proxy users
If your network proxies ALL HTTP and HTTPS traffic from your device fleet to the Internet and local network, it's likely that you will experience problems when printing.
To enable printing proxy exclusion/bypass, lists will be required to allow the client devices to communicate directly with the printers.
The network administrator will need to include proxy exclusion lists in one of the following places:
Option 1 - Exclude all local network traffic from proxy - using proxy.pac configuration
For example, configure your clients not to use the proxy for local network traffic.
If you have a 172.16.x.x address range the administrator will need to exclude proxy for all traffic with destination 172.16.*.*. or exclude a list of printer hostnames or IP addresses from proxying. An example of such a local-network excluded proxy.pac configuration file can be found below:
function FindProxyForURL(url, host) {
// If the hostname matches, send direct.
if (dnsDomainIs(host, "intranet.domain.com") ||
shExpMatch(host, "(*.abcdomain.com|abcdomain.com)"))
return "DIRECT";
// If the protocol or URL matches, send direct.
if (url.substring(0, 4)=="ftp:" ||
shExpMatch(url, "http://abcdomain.com/folder/*"))
return "DIRECT";
// If the requested resource (e.g. printer) is hosted within the internal network, send direct.
if (isPlainHostName(host) ||
shExpMatch(host, "*.local") ||
isInNet(dnsResolve(host), "10.0.0.0", "255.0.0.0") ||
isInNet(dnsResolve(host), "172.16.0.0", "255.240.0.0") ||
isInNet(dnsResolve(host), "192.168.0.0", "255.255.0.0") ||
isInNet(dnsResolve(host), "127.0.0.0", "255.255.255.0"))
return "DIRECT";
// If the IP address of the local machine is within a defined
// subnet, send to a specific proxy.
if (isInNet(myIpAddress(), "10.10.5.0", "255.255.255.0"))
return "PROXY 1.2.3.4:8080";
// DEFAULT RULE: All other traffic, use below proxies, in fail-over order.
return "PROXY 4.5.6.7:8080; PROXY 7.8.9.10:8080";
}Option 2 - G Suite users - use the network configuration section to exclude printer addresses
Chromebook admins are able to provide manual proxy-bypass lists to Chrome devices through the G Suite admin panel.
- In the G Suite console navigate to Device management > Networks > WIFI (or Ethernet).
- Add or edit an existing WiFi or Ethernet network.
- Select 'Manual Proxy Configuration' and enter the proxy information, proxy server IP/hostname, and port.
- Enter a network range or specific IP addresses for the printers. e.g. 172.16.5.53 (specific printer), xerox1.mydomain (specific printer by hostname) or 172.16.5.* (e.g. local subnet).
Proxy server settings.