Hello,guys:

I use the newest 3.28 version of BlueZ and two bluetooth devices to setup the PAN  network on two different Linux box.

the SERVER side running dbus-daemon,hcid and pand daemon like that:

 8180 ?        Ss     0:00 /sbin/hcid -s -f /etc/bluetooth/hcid.conf
 8183 ?        S      0:00 /lib/bluetooth/bluetoothd-service-input
 8184 ?        S      0:00 /lib/bluetooth/bluetoothd-service-network
 8185 ?        S      0:00 /lib/bluetooth/bluetoothd-service-serial
 8189 ?        Ss     0:00 pand --listen --master --role NAP --ethernet bnep0 --device 00:A0:B0:E0:48:25


and then,the CLIENT side run in a simple way like this: 
pand --connect 00:A0:B0:E0:48:25

the ERROR is :  pand[8191]: Connection failed. Permission denied(13)

the sys LOG is list below:

Apr  3 17:15:05 bip313 hcid[8180]: Bluetooth HCI daemon
Apr  3 17:15:05 bip313 hcid[8180]: HCI dev 0 registered
Apr  3 17:15:05 bip313 hcid[8180]: HCI dev 0 already up
Apr  3 17:15:05 bip313 hcid[8180]: Device hci0 has been added
Apr  3 17:15:05 bip313 hcid[8180]: Starting security manager 0
Apr  3 17:15:05 bip313 hcid[8180]: Device hci0 has been activated
Apr  3 17:15:05 bip313 hcid[8180]: Starting SDP server
Apr  3 17:15:05 bip313 hcid[8180]: Created local server at unix:abstract=/var/run/dbus-BBAibFkMvI,guid=a5abffc66b1d327133d76e3847f49209
Apr  3 17:15:05 bip313 input[8183]: Bluetooth Input daemon
Apr  3 17:15:05 bip313 input[8183]: Registered input manager path:/org/bluez/input
Apr  3 17:15:05 bip313 network[8184]: Bluetooth Network daemon
Apr  3 17:15:05 bip313 serial[8185]: Bluetooth Serial Port daemon
Apr  3 17:15:05 bip313 serial[8185]: Registered manager path:/org/bluez/serial
Apr  3 17:15:05 bip313 network[8184]: Registered manager path:/org/bluez/network
Apr  3 17:15:05 bip313 network[8184]: Registered server path:/org/bluez/network/nap
Apr  3 17:15:05 bip313 network[8184]: Registered server path:/org/bluez/network/gn
Apr  3 17:15:05 bip313 network[8184]: Registered server path:/org/bluez/network/panu
Apr  3 17:17:33 bip313 pand[8189]: Bluetooth PAN daemon version 3.28
Apr  3 17:18:16 bip313 pand[8191]: Connection failed. Permission denied(13)

Please give me some idea, or I'm going to look into the souce code of bnep_accept_connection to try to find what has happened.

Thanks ,everyone.