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Troubleshooting
WorkCentre 7425/7428/7435
System Administrator Guide
198
IPP Troubleshooting
Use the following check list to troubleshoot your network communication problem.
Check Physical Media and Network Interface Cards
1. Verify that the printer is powered On.
2. Verify that the printer and Computer are using the correct cabling to communicate over the
network. Use category 3 UTP patch (not crossover) cable for 10 Base T communications, category 5
UTP patch (not crossover) cable for 10 Base T / 100 Base TX communications, and Token Ring
cabling for Token Ring networks.
3. Verify that the cable at both the printer and Computer is fully plugged into the Network Interface
Card (NIC). Check the light, which is typically a green LED, to make sure that it is lit. Typically, but
not always, a second light on the Network Interface Card will be intermittently flashing, indicating
the presence of network traffic. If neither of these lights is lit, there is a problem with the NIC.
At the Printer
1. Print a Configuration Report. Under the Ethernet Rated Speed data label on the Report, verify that
your communications speed is correctly set for your network and that you have a MAC address
listed. The driver for your NIC works at the Media Access Control (MAC) layer of the protocol stack.
If no MAC address is shown, you have either a bad NIC or no NIC at all. Replace or install the
Network Interface Card.
2. Under the CentreWare Internet Services data label, verify that this feature is Enabled.
3. Under the TCP/IP data label, determine the method being used to assign TCP/IP addressing to the
printer. Verify that the IP Address, Subnet Mask, and Gateway addresses are correct for your
network and have not changed from their previous settings.
Note: The use of DHCP (the DHCP Server) with a short lease time can cause the printer to be assigned
a new IP Address when it is powered off for an extended period of time. This will interrupt
communications with computers using the old IP address. If you do not want the IP address to be
subject to constant changes, either increase the lease time at the DHCP Server, or use the Static IP
Addressing method . For more information, see TCP/IP Protocol Configuration on page 43.
4. Under the IPP data label, verify that the IPP Port is Enabled. For more information, see IPP
Configuration on page 54.
5. Under the IPP data label, verify that IPP is using DNS to resolve Host Names to IP Addresses in
support of IPP printing. If it is not, type the printer’s IP address into your Web browser’s address
field and press enter. Click the Properties tab. Click the Connectivity folder, then the Protocols
folder and click IPP. Verify that the DNS Enablement Check Box is checked. If it is not checked,
check it with your mouse and click Apply, then Reboot Machine.
6. Under the IPP data label, verify that the Port number associated with IPP is 631. This is the port
number assigned to IPP by the Internet Assigned Numbers Authority.