Here's /var/log/messages after trying to connect twice with modem monitor.
Mar 29 10:57:06 localhost pppd[9651]: pppd 2.4.2 started by root, uid 0
Mar 29 10:57:08 localhost pppd[9651]: Exit.
Mar 29 10:59:32 localhost pppd[10406]: pppd 2.4.2 started by root, uid 0
Mar 29 10:59:34 localhost pppd[10406]: Exit.
Then it worked fine with pon.
Mar 29 10:59:55 localhost pppd[10549]: pppd 2.4.2 started by lexhider, uid 1000
Mar 29 11:00:23 localhost pppd[10549]: Serial connection established.
Mar 29 11:00:23 localhost pppd[10549]: Using interface ppp0
Mar 29 11:00:23 localhost pppd[10549]: Connect: ppp0 <--> /dev/ttyS1
Mar 29 11:00:25 localhost pppd[10549]: CHAP authentication succeeded
Mar 29 11:00:26 localhost pppd[10549]: local IP address 220.235.84.250
Mar 29 11:00:26 localhost pppd[10549]: remote IP address 202.173.159.33
Mar 29 11:00:26 localhost pppd[10549]: primary DNS address 203.21.20.20
Mar 29 11:00:26 localhost pppd[10549]: secondary DNS address 203.10.1.9
I just upgraded and this didn't fix it.
Here's /var/log/messages after trying to connect twice with modem monitor.
Mar 29 10:57:06 localhost pppd[9651]: pppd 2.4.2 started by root, uid 0
Mar 29 10:57:08 localhost pppd[9651]: Exit.
Mar 29 10:59:32 localhost pppd[10406]: pppd 2.4.2 started by root, uid 0
Mar 29 10:59:34 localhost pppd[10406]: Exit.
Then it worked fine with pon.
Mar 29 10:59:55 localhost pppd[10549]: pppd 2.4.2 started by lexhider, uid 1000
Mar 29 11:00:23 localhost pppd[10549]: Serial connection established.
Mar 29 11:00:23 localhost pppd[10549]: Using interface ppp0
Mar 29 11:00:23 localhost pppd[10549]: Connect: ppp0 <--> /dev/ttyS1
Mar 29 11:00:25 localhost pppd[10549]: CHAP authentication succeeded
Mar 29 11:00:26 localhost pppd[10549]: local IP address 220.235.84.250
Mar 29 11:00:26 localhost pppd[10549]: remote IP address 202.173.159.33
Mar 29 11:00:26 localhost pppd[10549]: primary DNS address 203.21.20.20
Mar 29 11:00:26 localhost pppd[10549]: secondary DNS address 203.10.1.9