I have been struggling with setting up two serial ports on an HP/Compaq D512S (Intel P4) under CentOS-5. I am not at all sure why these things were not auto-configured when I initially installed the CentOS system from CDs but they were not. I have found various resources on the web and from them uncovered the setserial utility. What I need from somebody is guidance on how to use this utility to properly configure the ports. Currently in /dev/ I have: crw------- 1 uucp uucp 4, 64 Dec 21 12:14 ttyS0 crw------- 1 root root 4, 65 Dec 20 17:36 ttyS1 crw------- 1 root root 4, 66 Dec 20 17:36 ttyS2 crw------- 1 root root 4, 67 Dec 20 17:36 ttyS3 When I run setserial -g ttyS* I get this: # setserial -g ttyS* Cannot get serial info: Invalid argument ttyS1: No such device or address ttyS2: No such device or address ttyS3: No such device or address Can someone walk me through this? I setup hylafax previously on our existing CentOS-4.5 server and never had this difficulty nor had to use setserial, so far as I can recall. Sincerely, -- *** E-Mail is NOT a SECURE channel *** James B. Byrne mailto:ByrneJB at Harte-Lyne.ca Harte & Lyne Limited http://www.harte-lyne.ca 9 Brockley Drive vox: +1 905 561 1241 Hamilton, Ontario fax: +1 905 561 0757 Canada L8E 3C3