I am running bird 1.6.6. As shown in the following log messages, I have 2 BGP neighbors configured, but the sessions are not up. I keep getting those connection rejected messages. Anyone knows what’s the cause of it and how to fix it? Thanks in advance, Wei ============================================================================= 2020-10-29 17:58:27 <RMT> bgp1_rdomain_0: Error: Hold timer expired 2020-10-29 17:58:28 <WARN> bgp found listen socket for p:bgp1_rdomain_0 s_node:0000000000693770 s:0000000000693640 2020-10-29 17:58:48 <INFO> bgp1_rdomain_0: Incoming connection sk:0000000000693a30 from 10.0.143.81 (port 37163) rejected 2020-10-29 17:59:01 <INFO> bgp1_rdomain_0: Incoming connection sk:00000000007e6e80 from 10.0.143.81 (port 11955) rejected 2020-10-29 17:59:14 <INFO> bgp1_rdomain_0: Incoming connection sk:0000000000698de0 from 10.0.143.81 (port 43375) rejected 2020-10-29 18:56:28 <RMT> bgp2_rdomain_0: Error: Hold timer expired 2020-10-29 18:56:29 <WARN> bgp found listen socket for p:bgp2_rdomain_0 s_node:0000000000693110 s:0000000000693140 2020-10-29 18:56:59 <INFO> bgp2_rdomain_0: Incoming connection sk:00000000006d39a0 from 10.0.142.81 (port 45446) rejected 2020-10-29 18:57:11 <INFO> bgp2_rdomain_0: Incoming connection sk:00000000007f3de0 from 10.0.142.81 (port 36129) rejected 2020-10-29 18:57:16 <INFO> Processed 2 routes for message of size 40 2020-10-29 18:57:22 <INFO> bgp2_rdomain_0: Incoming connection sk:00000000007f4140 from 10.0.142.81 (port 30384) rejected 2020-10-29 18:57:30 <INFO> bgp2_rdomain_0: Incoming connection sk:00000000008a9d50 from 10.0.142.81 (port 39059) accepted 2020-10-29 18:58:30 <INFO> Processed 2 routes for message of size 40 2020-10-29 19:25:16 <RMT> bgp2_rdomain_0: Error: Hold timer expired 2020-10-29 19:25:17 <WARN> bgp found listen socket for p:bgp2_rdomain_0 s_node:0000000000693110 s:0000000000693140 2020-10-29 19:25:48 <INFO> bgp2_rdomain_0: Incoming connection sk:00000000008a9d50 from 10.0.142.81 (port 32690) rejected 2020-10-29 19:26:02 <INFO> bgp2_rdomain_0: Incoming connection sk:00000000008a9d50 from 10.0.142.81 (port 52332) rejected 2020-10-29 19:55:43 <RMT> bgp2_rdomain_0: Error: Hold timer expired 2020-10-29 19:55:43 <WARN> bgp found listen socket for p:bgp2_rdomain_0 s_node:0000000000693110 s:0000000000693140 2020-10-29 19:55:53 <INFO> bgp2_rdomain_0: Incoming connection sk:00000000008a9d50 from 10.0.142.81 (port 49693) rejected 2020-10-29 19:56:07 <INFO> bgp2_rdomain_0: Incoming connection sk:00000000008a9d50 from 10.0.142.81 (port 34617) rejected 2020-10-29 19:56:21 <INFO> bgp2_rdomain_0: Incoming connection sk:00000000008a9d50 from 10.0.142.81 (port 16554) rejected 2020-10-29 19:56:30 <INFO> bgp2_rdomain_0: Incoming connection sk:00000000008a9d50 from 10.0.142.81 (port 40954) rejected 2020-10-29 19:59:26 <RMT> bgp2_rdomain_0: Error: Hold timer expired 2020-10-29 19:59:26 <WARN> bgp found listen socket for p:bgp3_rdomain_0 s_node:0000000000693110 s:0000000000693140 2020-10-29 19:59:26 <WARN> bgp found listen socket for p:bgp2_rdomain_0 s_node:0000000000693110 s:0000000000693140 2020-10-29 19:59:40 <INFO> bgp2_rdomain_0: Incoming connection sk:0000000000693b40 from 10.0.142.81 (port 48975) rejected 2020-10-29 19:59:50 <RMT> bgp1_rdomain_0: Error: Hold timer expired 2020-10-29 19:59:51 <WARN> bgp found listen socket for p:bgp1_rdomain_0 s_node:0000000000693770 s:0000000000693640 2020-10-29 19:59:52 <INFO> bgp2_rdomain_0: Incoming connection sk:0000000000693b40 from 10.0.142.81 (port 11000) rejected 2020-10-29 19:59:52 <INFO> bgp1_rdomain_0: Incoming connection sk:00000000006a3590 from 10.0.143.81 (port 19880) rejected 2020-10-29 20:00:00 <INFO> bgp1_rdomain_0: Incoming connection sk:00000000006a3590 from 10.0.143.81 (port 25771) rejected 2020-10-29 20:00:01 <INFO> bgp2_rdomain_0: Incoming connection sk:00000000006a3590 from 10.0.142.81 (port 30442) rejected 2020-10-29 20:00:10 <INFO> bgp1_rdomain_0: Incoming connection sk:00000000006a3590 from 10.0.143.81 (port 44408) rejected 2020-10-29 20:00:10 <INFO> bgp2_rdomain_0: Incoming connection sk:00000000006a3590 from 10.0.142.81 (port 47468) rejected 2020-10-29 20:00:18 <INFO> bgp1_rdomain_0: Incoming connection sk:00000000006a3590 from 10.0.143.81 (port 23674) rejected 2020-10-29 20:00:19 <INFO> bgp2_rdomain_0: Incoming connection sk:00000000006a3590 from 10.0.142.81 (port 21274) rejected 2020-10-29 20:00:25 <INFO> bgp2_rdomain_0: Incoming connection sk:00000000006d3b30 from 10.0.142.81 (port 14859) rejected 2020-10-29 20:00:28 <INFO> bgp1_rdomain_0: Incoming connection sk:00000000006d3b30 from 10.0.143.81 (port 43656) rejected 2020-10-29 20:00:33 <INFO> bgp2_rdomain_0: Incoming connection sk:00000000006d3b30 from 10.0.142.81 (port 44701) rejected 2020-10-29 20:00:39 <INFO> bgp1_rdomain_0: Incoming connection sk:00000000006d3b30 from 10.0.143.81 (port 34627) rejected 2020-10-29 20:00:43 <INFO> bgp2_rdomain_0: Incoming connection sk:00000000006d3bc0 from 10.0.142.81 (port 43653) rejected 2020-10-29 20:00:55 <INFO> bgp2_rdomain_0: Incoming connection sk:00000000007f34f0 from 10.0.142.81 (port 53653) rejected 2020-10-29 20:01:07 <INFO> bgp2_rdomain_0: Incoming connection sk:00000000008a9200 from 10.0.142.81 (port 32885) accepted 2020-10-29 20:08:15 <RMT> bgp2_rdomain_0: Error: Hold timer expired 2020-10-29 20:08:16 <WARN> bgp found listen socket for p:bgp2_rdomain_0 s_node:0000000000693110 s:0000000000693140 2020-10-29 20:08:16 <RMT> bgp4_rdomain_0: Received: Hold timer expired 2020-10-29 20:08:16 <WARN> bgp found listen socket for p:bgp4_rdomain_0 s_node:0000000000693110 s:0000000000693140 2020-10-29 20:08:35 <INFO> bgp2_rdomain_0: Incoming connection sk:00000000008a9200 from 10.0.142.81 (port 39637) rejected 2020-10-29 20:08:45 <INFO> bgp2_rdomain_0: Incoming connection sk:000000000089f870 from 10.0.142.81 (port 25534) rejected 2020-10-29 20:08:58 <INFO> bgp2_rdomain_0: Incoming connection sk:000000000089f870 from 10.0.142.81 (port 34717) rejected 2020-10-29 20:09:06 <INFO> bgp4_rdomain_0: Incoming connection sk:000000000089f870 from 10.0.142.50 (port 57037) rejected 2020-10-29 20:09:09 <INFO> bgp2_rdomain_0: Incoming connection sk:000000000089f870 from 10.0.142.81 (port 43132) rejected 2020-10-29 20:09:10 <INFO> bgp4_rdomain_0: Incoming connection sk:000000000089f870 from 10.0.142.50 (port 52005) accepted 2020-10-29 20:12:39 <RMT> bgp3_rdomain_0: Error: Hold timer expired 2020-10-29 20:12:40 <WARN> bgp found listen socket for p:bgp3_rdomain_0 s_node:0000000000693110 s:0000000000693140 2020-10-29 20:13:27 <RMT> bgp4_rdomain_0: Error: Hold timer expired 2020-10-29 20:13:28 <WARN> bgp found listen socket for p:bgp4_rdomain_0 s_node:0000000000693110 s:0000000000693140 2020-10-29 20:14:24 <INFO> bgp4_rdomain_0: Incoming connection sk:00000000007e0710 from 10.0.142.50 (port 43162) accepted 2020-10-29 20:16:40 <RMT> bgp4_rdomain_0: Error: Hold timer expired 2020-10-29 20:16:41 <WARN> bgp found listen socket for p:bgp4_rdomain_0 s_node:0000000000693110 s:0000000000693140