I am trying to setup a dial in server on Linux 7.1 using Mgetty. This is the log I am getting in /var/log/ for ttyS0 . 05/30 02:36:36 yS1 mgetty: experimental test release 1.1.14-Apr02 05/30 02:36:36 yS1 check for lockfiles 05/30 02:36:36 yS1 locking the line 05/30 02:36:36 yS1 WARNING: DCD line still active, check modem settings (AT&Dx) 05/30 02:36:36 yS1 lowering DTR to reset Modem 05/30 02:36:37 yS1 TIOCMBIS failed: Input/output error 05/30 02:36:37 yS1 cannot turn off soft carrier: Input/output error 05/30 02:36:37 yS1 tcgetattr failed: Input/output error 05/30 02:36:37 yS1 cannot get TIO: Input/output error 05/30 02:36:37 yS1 mg_init_device failed, trying again 05/30 02:36:37 yS1 WARNING: DCD line still active, check modem settings (AT&Dx) 05/30 02:36:37 yS1 lowering DTR to reset Modem 05/30 02:36:37 yS1 TIOCMBIS failed: Input/output error 05/30 02:36:37 yS1 cannot turn off soft carrier: Input/output error 05/30 02:36:37 yS1 tcgetattr failed: Input/output error 05/30 02:36:37 yS1 cannot get TIO: Input/output error Could you please guide me how should I fix it? I am using Red Hat Linux 7.1, and Megtty. Modem : US robotics 56K PCI Voice, which linux detects and configures automatically. it is connected to ttuS0. The line I am writing in initab for running is 0:2345:respawn:/sbin/mgetty /dev/ttyS0 All Mgetty related configurations, I am writing in Mgetty config. files... Ur help will be hightly appreciated, since I am stuck & dunno whats going wrong ...