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Troubleshooting 441
Modem Problems
Modem Problems
The IOLAN is not initializing the modem.
z Check your Line Service is set to SLIP or PPP. If your line service is set to any other type, the
IOLAN will not initialize a modem. You will need to configure the modem manually.
PPP Problems
The link fails on start-up when there are remote IP addresses set for both a user (Framed IP
value) and a line (
Remote IP address).
z Check the IP address set for the user; this is used in preference to the IP address set for a line. If
there is a problem with the user’s IP address, negotiation will fail; the IOLAN will not use the
line’s IP address as an alternative.
The link fails on start-up and security (either PAP or CHAP) is enabled on the line.
z Check the remote client/device has the same setting; that is, PAP if the IOLAN is using PAP. The
IOLAN does not perform negotiation with the remote end over PAP or CHAP.
At the remote end, the client software locks up when security (CHAP) is enabled on the line.
z Disable CHAP re-challenge parameter (challenge_interval) in the IOLAN. Some PPP client
software does not work when receiving CHAP re-challenges.
PPP is not running successfully over your 485 half-duplex environment.
z PPP is incompatible with half-duplex; it must be run over a full-duplex environment.
Printing Problems
The print job fails to print on the device attached to the serial port.
z On the line where the printer is attached, set Line Service to Printer. Print jobs will not print
when the line service is set incorrectly.
When using RCP, the network host receives a rejection message from the IOLAN. The result is
that the print job does not take place.
z Print using LPD
or
z Modify the printer interface scripts on the network host to overcome this weakness of RCP. The
modification will force the network host to continue trying to send the print job when the
IOLAN’s printer port is busy.
Long Reboot Cycle
Rebooting the IOLAN takes a long time.
If you are not using DHCP/BOOTP, disable this within the Server Services; otherwise, the IOLAN
waits to timeout for a request to DHCP/BOOTP.