PPPoE Connection Bug!

[Felix]

I am using Freebsd 6.0 to become my server and provide the PPPoE service
to rest of my staffs PCs. It is success without any problem but
sometimes I found it comes out with errors message in my log file when
some of the staffs cannot online. The error messages is looked like
below:

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Jan 27 10:29:40 eBoffice3 ppp[714]: Phase: Using interface: tun2
Jan 27 10:29:40 eBoffice3 ppp[714]: Phase: deflink: Created in closed
state
Jan 27 10:29:40 eBoffice3 ppp[714]: Command: default: enable pap
Jan 27 10:29:40 eBoffice3 ppp[714]: Command: default: enable proxy
Jan 27 10:29:40 eBoffice3 ppp[714]: Command: default: disable ipv6cp
Jan 27 10:29:40 eBoffice3 ppp[714]: Command: default: set mru 1472
Jan 27 10:29:40 eBoffice3 ppp[714]: Command: default: set mtu 1472
Jan 27 10:29:40 eBoffice3 ppp[714]: Command: default: set ifaddr
10.1.91.1 10.1.91.2-10.1.91.254
Jan 27 10:29:40 eBoffice3 ppp[714]: Command: default: set radius
/etc/radius.conf
Jan 27 10:29:40 eBoffice3 ppp[714]: Command: default: accept dns
Jan 27 10:29:40 eBoffice3 ppp[714]: Command: default: set timeout 3600
Jan 27 10:29:40 eBoffice3 ppp[714]: Command: default: disable protocomp
Jan 27 10:29:40 eBoffice3 ppp[714]: Command: default: enable echo
Jan 27 10:29:40 eBoffice3 ppp[714]: Command: default: set lqrperiod 10
Jan 27 10:29:40 eBoffice3 ppp[714]: Command: default: set echoperiod 10
Jan 27 10:29:40 eBoffice3 ppp[714]: Command: default: set rad_alive 1800
Jan 27 10:29:40 eBoffice3 ppp[714]: Command: default: set speed sync
Jan 27 10:29:40 eBoffice3 ppp[714]: Command: default: set log Chat
Command Phase LCP LQM
Jan 27 10:29:40 eBoffice3 ppp[714]: Command: default: enable pap
Jan 27 10:29:40 eBoffice3 ppp[714]: Command: default: enable proxy
Jan 27 10:29:40 eBoffice3 ppp[714]: Command: default: disable ipv6cp
Jan 27 10:29:40 eBoffice3 ppp[714]: Command: default: set mru 1472
Jan 27 10:29:40 eBoffice3 ppp[714]: Command: default: set mtu 1472
Jan 27 10:29:40 eBoffice3 ppp[714]: Command: default: set ifaddr
10.1.91.1 10.1.91.2-10.1.91.254
Jan 27 10:29:40 eBoffice3 ppp[714]: Command: default: set radius
/etc/radius.conf
Jan 27 10:29:40 eBoffice3 ppp[714]: Command: default: accept dns
Jan 27 10:29:40 eBoffice3 ppp[714]: Command: default: set timeout 3600
Jan 27 10:29:40 eBoffice3 ppp[714]: Command: default: disable protocomp
Jan 27 10:29:40 eBoffice3 ppp[714]: Command: default: enable echo
Jan 27 10:29:40 eBoffice3 ppp[714]: Command: default: set lqrperiod 10
Jan 27 10:29:40 eBoffice3 ppp[714]: Command: default: set echoperiod 10
Jan 27 10:29:40 eBoffice3 ppp[714]: Command: default: set rad_alive 1800
Jan 27 10:29:40 eBoffice3 ppp[714]: Command: default: set speed sync
Jan 27 10:29:40 eBoffice3 ppp[714]: Phase: PPP Started (direct mode).
Jan 27 10:29:40 eBoffice3 ppp[714]: Phase: bundle: Establish
Jan 27 10:29:40 eBoffice3 ppp[714]: Phase: deflink: closed -> opening
Jan 27 10:29:40 eBoffice3 ppp[714]: Phase: deflink: Link is a closed
socket !
Jan 27 10:29:40 eBoffice3 ppp[714]: Chat: Failed to open device (attempt
1 of 1)
Jan 27 10:29:40 eBoffice3 ppp[714]: Phase: deflink: opening -> closed
Jan 27 10:29:40 eBoffice3 ppp[714]: Phase: bundle: Dead
Jan 27 10:29:40 eBoffice3 ppp[714]: Phase: PPP Terminated (normal).

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I searched for the internet but found nothing. Any comment or opinion
about this? Thanks!

Regard
Felix