lowest level security

Dear sir,

we are trying to use lowest level security with password "12345678" using indian standard as a manufacturer.
but the response from tool is as follows :
what is the problem?
The response is as per the blue book examples given.
thanks is advance.

15:04:55 Initializing serial connection.
15:04:55 Send SNRM request.
7E A0 17 00 02 0E D3 41 93 BD AD 81 80 08 05 02 00 80 06 02 00 80 F8 85 7E
15:04:55 Received data
7E A0 23 41 00 02 0E D3 73 54 2E 81 80 14 05 02 00 80 06 02 00 80 07 04 00 00 00 01 08 04 00 00 00 01 CE 6A 7E
15:04:55 Parsing UA reply.<CR><LF>81 80 14 05 02 00 80 06 02 00 80 07 04 00 00 00 01 08 04 00 00 00 01
15:04:55 Parsing UA reply succeeded.
15:04:55 Send AARQ request
7E A0 46 00 02 0E D3 41 10 34 F6 E6 E6 00 60 35 A1 09 06 07 60 85 74 05 08 01 01 8A 02 07 80 8B 07 60 85 74 05 08 02 01 AC 09 80 07 41 42 43 44 45 46 47 BE 10 04 0E 01 00 00 00 06 5F 1F 04 00 00 3C 1F 00 71 92 C0 7E
15:04:56 Received data
7E A0 3A 41 00 02 0E D3 30 3B AA E6 E7 00 61 35 A1 09 06 07 60 85 74 05 08 01 01 A2 03 02 01 00 A3 05 A1 03 02 01 02 BE 10 04 0E 08 00 06 5F 1F 04 00 00 3C 1F 00 71 00 07 F8 66 7E
15:04:56 Parsing AARE reply<CR><LF>61 35 A1 09 06 07 60 85 74 05 08 01 01 A2 03 02 01 00 A3 05 A1 03 02 01 02 BE 10 04 0E 08 00 06 5F 1F 04 00 00 3C 1F 00 71 00 07
15:04:56 Disconnect request
System.Exception: Not enough data.
at GXDLMSDirector.GXDLMSDevice.InitializeConnection()
at GXDLMSDirector.MainForm.Connect(Control sender, Object[] parameters)