KErrL2CAPAccessRequestDenied Error when Connct to Bluetooth

[xmnlk]

I want to connect to a buletooth device, after searching devices and services,i use socket to connet,The service's type is KSerialPortUUID.

User::LeaveIfError( iSocket.Open( iSocketServer, KStrRFCOMM ) );
TBTSockAddr address;
iCurrDevData->iDeviceServicePort = iServiceSearcher->Port();
address.SetBTAddr( iCurrDevData->iDeviceAddr);
address.SetPort( iCurrDevData->iDeviceServicePort );
iSocket.Connect( address, iStatus );

iStatus allways return KErrL2CAPAccessRequestDenied -6311.How can I resolved problem?

SDK 3.0 MR

[xmnlk]

This problem will not apeared if I have paired before using system bluetooth.
When I connet to other device which need password ,is there any security policy I should setting?

[wizard_hu_]

Default security settings may be too high (check TBTSockAddr::BT/SetSecurity).

[xmnlk]

Default security settings may be too high (check TBTSockAddr::BT/SetSecurity).

I set secuity to the TBTSockAddr:

TBTSockAddr address;
address.SetBTAddr( iCurrDevData->iDeviceAddr);
address.SetPort( iCurrDevData->iDeviceServicePort );
TBTServiceSecurity oandxSecurity;
TUid settingsUID;
settingsUID.iUid = 0x1101;
oandxSecurity.SetUid(settingsUID);
oandxSecurity.SetAuthentication(EFalse); // don't require key (PIN) exchange
oandxSecurity.SetAuthorisation(EFalse); // require local user to confirm accept
oandxSecurity.SetEncryption(EFalse);
oandxSecurity.SetDenied(EFalse);
address.SetSecurity(oandxSecurity);
// iBtSocket.set
TInt ss = iBtSocket->Connect(address);

But it still appear the KErrL2CAPAccessRequestDenied.The red words mean it is a serialport service.Are there any parameter is wrong? When I connect to a mobile phone it can work,but it is the only one can be connected.

[xmnlk]

By the way, If it has been paired using sysmtem buletooth application, It can connect to our device(not phone)using my program,otherwise there will be KErrL2CAPAccessRequestDenied.