> [mailto:centos-bounces at centos.org] On Behalf Of Frank Cox > Sent: Wednesday, December 03, 2008 3:50 AM > To: centos at centos.org > Subject: [CentOS] User access to /dev/ttyUSB0 > > I have been trying to get an EVDO modem to work with Centos > 5. I can make it > dial out with wvdial only when I'm the root user. Otherwise > I get this error: > > Cannot open /dev/ttyUSB0: Device or resource busy > > I added the user to the uucp group. > > crw-rw---- 1 root uucp 188, 0 Dec 3 02:30 /dev/ttyUSB0 > crw-rw---- 1 root uucp 188, 1 Dec 3 02:30 /dev/ttyUSB1 > crw-rw---- 1 root uucp 188, 2 Dec 3 02:30 /dev/ttyUSB2 > crw-rw---- 1 root uucp 188, 3 Dec 3 02:30 /dev/ttyUSB3 > > What have I missed? Hmm Lets see here... system-config-network Select (highlight) your PPP Adapter, then click on Edit. That will be under the Devices Tab. Next Look under the General Tab. Place a Check in "Allow all Users to enable or disable the Device". JohnStanley