Non/late closing conversations without fire and forget

Hello.

I have two Service Broker instances running on different Servers. Both are constructed the same way but only one of them has trouble closing conversations. This problem started to occur on the 16th of October months after the start of the Service Broker.

Both queues are in the same database. Most of the time the conversation close normal but on some days the conversations close late or never. Here is my monitoring of the conversing conversations per day:

10/16: 1

10/24: 1

11/04: 20119

11/05: 24207

11/06: 29848

11/12: 1

11/19: 1

11/27: 1

On the 28th of November in the morning I saw 10748 open conversation for the 27th but the number was decreasing down to one open conversation. As you can see on days where the problem occurs at least one open conversation remains.

I do not understand why this happens. The only difference between the two Service Broker instances is the reliability of the network over which a webservice is called on the receiving end of the Service Broker. Can this unreliability cause conversations to remain open or close late?

Here an example for a conversation which remains open:

conversation_handle	conversation_id	is_initiator	service_contract_id	conversation_group_id	service_id	lifetime	state	state_desc	far_service	far_broker_instance	principal_id	far_principal_id	outbound_session_key_identifier	inbound_session_key_identifier	security_timestamp	dialog_timer	send_sequence	last_send_tran_id	end_dialog_sequence	receive_sequence	receive_sequence_frag	system_sequence	first_out_of_order_sequence	last_out_of_order_sequence	last_out_of_order_frag	is_system	priority
EB108673-573A-E411-A731-2C44FD81E734	09AB4E1D-3EEF-4CAA-8358-85B50CCEE472	1	65536	EC108673-573A-E411-A731-2C44FD81E734	65536	2082-09-30 11:47:31.377	CO	CONVERSING	//SAPReceiverService	A3869A41-8F7C-4C13-B378-C5FA0DA7492E	1	-1	00000000-0000-0000-0000-000000000000	00000000-0000-0000-0000-000000000000	1900-01-01 00:00:00.000	1900-01-01 00:00:00.000	1	0x29CB4D000000	-1	0	0	0	-1	0	0	0	5
4E7F19AB-AE65-E411-A731-2C44FD81E734	01EA85EB-A3A8-41CE-BDC0-85B5261553D3	0	65536	4D7F19AB-AE65-E411-A731-2C44FD81E734	65538	2082-11-24 15:27:35.827	CO	CONVERSING	//SAPSenderService	A3869A41-8F7C-4C13-B378-C5FA0DA7492E	1	1	00000000-0000-0000-0000-000000000000	00000000-0000-0000-0000-000000000000	2014-11-06 12:46:36.540	1900-01-01 00:00:00.000	0	0x000000000000	-1	1	0	0	-1	0	0	0	5

Thanks in advance

Susanne