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Computer Communication Problems

Additional OkiLAN

®

 510w 

Troubleshooting

Computer Communication Problems

 

Basic:

 Of the computers connected to the same network, some can 

communicate and some cannot.

Possible Cause

Suggested Solution(s)

The setup of the wireless 
computer in the Ad-Hoc 
mode is incorrect.

1. Record the wireless settings (SSID, 

authentication encryption setting, and channel) 
and the network settings (IP address, subnet 
mask and default gateway) of the computer 
that cannot communicate. 

2. Compare them to the equivalent settings for a 

wireless computer that can communicate.

3. Change the settings for the 

non-communicating computer to match those 
of the communicating computer.

The wired network setup of 
the computer in the 
Infrastructure mode is 
incorrect.

1. Check the difference between the network 

settings (IP address, subnet mask and default 
gateway) of the computer that cannot 
communicate and the settings of the computer 
that can communicate.

2. Change the nework settings of the 

non-communicating computer to match those 
of the communicating computer.

There is a failure in the LAN 
cable or hub connecting to 
the computer in the 
Infrastructure mode.

Check the LAN cable and hub connected to the 
computer that cannot communicate. Replace 
them if necessary.

The 'IP Filtering' setting of 
the printer is incorrect.

Change the printer’s 'IP Filtering' setting to enable 
connection.

Note:

 You must change the  'IP Filtering' setting 

for the wired LAN interface and the wireless LAN 
card separately.

Summary of Contents for C9600hdn

Page 1: ... those of the communicating computer The wired network setup of the computer in the Infrastructure mode is incorrect 1 Check the difference between the network settings IP address subnet mask and default gateway of the computer that cannot communicate and the settings of the computer that can communicate 2 Change the nework settings of the non communicating computer to match those of the communica...

Page 2: ... used by the application utility in the Security setting of the wireless LAN card to active Note You must change the Security setting for the wired LAN interface and the wireless LAN card separately Possible Cause Suggested Solution s The wireless computer network settings are inappropriate Network settings such as the IP address are necessary even with an Ad Hoc mode connection Check the network ...

Page 3: ...reless computer or wireless card vendor and implement the remedy indicated there Update the device drivers and wireless client software of the wireless computer to the latest version Rarely wireless communication with the printer becomes unstable due to compatibility problems between the printer and the wireless computer Replace the wireless computer with a different type The same channel is being...

Page 4: ...structed Change the installation location or orientation of the printer s that cannot communicate Change the installation location or orientation of the access point Check for a radio wave source in the vicinity cordless phone microwave oven etc and turn off the power of unnecessary equipment A large number of wireless terminals notebook PCs etc have been connected simultaneously exceeding the max...

Page 5: ...nu and change the printer s IP address manually An IP address has been allocated by the DHCP server function of the access point Check the access point setting and properly set the DHCP server function The printer cannot communicate with the DHCP server Check the network connection with the access point and DHCP server Connect it so that the printer can communicate with the DHCP server through the...

Page 6: ...oint has a router function make sure it is set properly for the network that is connected The MAC filtering function of the access point is operating If the MAC address filtering function of the access point has been set to active you must record the printer in the authorized connection list Record the MAC address of the wireless LAN card in the access point Important Be careful not to inadvertent...

Page 7: ... version Replace the access point with a different type A large number of wireless terminals notebook PCs etc have been connected simultaneously exceeding the maximum number of connections Change the printer setting to connect a separate access point Turn off the power of unnecessary wireless terminals notebook PCs etc Note Wireless terminals are considered connected to the access point even when ...

Page 8: ...ting of the access point wireless computer does not match the printer Test the connection in Open mode See page 10 for more information Once the connection has been checked in Open mode change the setting in accordance with the wireless LAN environment you are using for example the WPA PSK mode The radio wave conditions are bad or the arrival of the radio waves is obstructed Change the installatio...

Page 9: ...he channel being used elsewhere Radio waves of adjacent channels will interfere with each other Access point obstruction Check for an access point obstruction See the table regarding specific asccess points on page 6 for more information Wireless computer obstruction in the Ad Hoc mode connection Check for a wireless computer obstruction See the table regarding Ad Hoc starting on page 2 for more i...

Page 10: ...e wireless standard of the access point wireless computer does not match the printer Check that the access point wireless computer are IEEE802 11b or IEEE802 11g compatible The printer only supports IEEE802 11b g Check that the IEEE802 11b or IEEE802 11g function of the access point wireless computer is enabled Change the settings so that the wireless standard used by the printer matches that used...

Page 11: ... Set to WEP 64 bits or 128 bits WEP key key size key entry mode and key index Note Some access points will have a function for automatically creating a WEP key from the entered character string This function is not compatible with the printer Note When the access point and wireless computer are set to authentication setting Open encryption mode WEP and the printer cannot be connected change the au...

Page 12: ...curity in the WPA PSK mode Change the setting to lengthen the updating interval of the encryption key of the access point Note This phenomenon may still occur unless the updating of the encryption key is set to Inactive If encryption key updating is set to Inactive security may be compromised Possible Cause Suggested Solution s The communication is delayed due to reauthentication Periodic reauthen...

Page 13: ...ertificates using the MD5 or SHA1 hash algorithms from the certificate issuance source No Client Authentication has been set in the Extended Key Usage attribute of the certificate Reissue certificates set with Client Authentication from the certificate issuance source Client Authentication is normally set for certificates issued for EAP authentication of a wireless LAN Certificate key sizes are no...

Page 14: ...correctly Encryption mode setting It have been set to TKIP The RADIUS server is incorrect Check the RADIUS server settings and then set them correctly Examples of the settings that need to be checked Authenticator access point settings The IP address of the access point the authorized authentication mode the shared secret etc have been set correctly EAP settings The EAP user name certificate etc h...

Page 15: ...ot coincide Change the encryption method of the access point to TKIP The Cipher Suite between the printer and the access point do not coincide Cipher Suite indices a combination of the key and cipher methods for EAP TLS authentication Change the setting of the RADIUS server and set the Cipher Suite supported by the RADIUS server to Active Below are the Cipher Suites supported by the printer DES 64...

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