On Wed, May 20, 2015 at 09:41:13PM +0200, Csányi Pál wrote: > I tried these commands: > $ cu -s 115200 -l /dev/ttyS0 > cu: /dev/ttyS0: Line in use > > $ cu -s 115200 -l /dev/ttyS1 # ( also S2, S3 ) > Connected. > cu: Got hangup signal > > Disconnected. > > dmesg gives me no ifnormation about such device: > [36829.865727] Shorewall:net-fw:DROP:IN=enp0s20 OUT= > MAC=00:1a:92:ce:61:70:00:22:02:00:07:3d:08:00 SRC=107.179.37.67 > DST=192.168.10.90 LEN=35 TOS=0x00 PREC=0x00 TTL=48 ID=30265 DF > PROTO=UDP SPT=50434 DPT=5093 LEN=15 > [38367.939572] usb 2-6: new full-speed USB device number 6 using ohci-pci > > Maybe the Shorewall firewall is the culprit in this case? I can almost guarantee you that your firewall has nothing to do with it. It is just conincidence that the previous kernel message was from the firewall. The issue as I see it is that the serial driver kernel module seems to not be loading. Are you running any sort of modified / alternative kernel? Can you post the results of "uname -a" for us? Also, a "sudo lsusb -v" might be helpful as well. --Sean
