Check that the system is configured for dial-in connections

Use the WAN view of the Network Configuration Manager to check that your system is configured to accept incoming connections and logins on the desired serial port or ISDN device. For more information about configuring modem ports to accept incoming calls, see ``Configuring a serial port''.

For incoming connections over a modem, try dialing the number and see if the modem answers the call. If the modem does not answer incoming calls, use the following steps to try and solve the problem:

1. Check that there is a ``Direct'' entry in the Devices(4bnu) file for the serial port to which the modem is attached. For the COM2 port, this should be an entry such as:

   Direct term/01m - 9600 direct
   

2. Connect to the modem port using cu(1bnu). For the COM2 port, issue the following command:
   
   cu -l term/01m

3. Enter the following codes to program the modem to answer on the second ring and save the settings:
   
   ATS0=2
   AT&W

4. Enter ~. to drop the connection.

1. To find out the tag names of the serial port monitors that are running, enter:
   
   sacadm -l -t ttymon

   Each instance of a serial port monitor is identified by a tag with the format ttymonN in the ``PMTAG'' field.

2. To find out which port monitor is running on the modem port, enter the following command for each monitor:
   
   pmadm -l -p ttymonN

   The name of the serial port is listed in the ``PMSPECIFIC'' field.

3. If no instance of ttymon is running on the modem port, check the configuration of the port using the Serial Manager. Make sure that the modem port accepts incoming calls, and that logins and modem auto-answer are enabled.

   If a ttymon process is monitoring the modem port, stop and restart it:
   
   sacadm -k -p ttymonN
   sacadm -s -p ttymonN

See ``Adding and configuring modems'' for more information about debugging dial-in problems with modems and the serial port monitor.

The procedure for checking whether an ISDN monitor is running to monitor incoming calls on ISDN lines is very similar to that for serial lines. The device node for an ISDN adapter is named /dev/netn, and the port monitor is isdnmon. You can configure an ISDN adapter to receive incoming calls using the WAN view of the Network Configuration Manager. For more information about troubleshooting ISDN connections, see ``Troubleshooting ISDN connections''.