I just compiled and started a full node again recently (after about 6 months) on ubuntu 12.04 (ARM). For some reason I am only seeing 2 inbound connections (and the max of 8 out). I have compiled versions 14.2, 13.1, and 13.2 and have seen the behavior on all three versions. Here is the debug.log information from my last start. I notice that a 3rd in connection will open when I get a version message from bitnodes.21.co, and then it will quickly disappear. Does anyone know why I cannot get more than 2 inbound connections?
2017-07-05 17:40:47 Bitcoin version v0.14.2.0-gfc61c8322bd
2017-07-05 17:40:47 InitParameterInteraction: parameter interaction: -whitelistforcerelay=1 -> setting -whitelistrelay=1
2017-07-05 17:40:47 Assuming ancestors of block 00000000000000000013176bf8d7dfeab4e1db31dc93bc311b436e82ab226b90 have valid signatures.
2017-07-05 17:40:47 Prune configured to target 100000MiB on disk for block and undo files.
2017-07-05 17:40:48 Default data directory [redacted]
2017-07-05 17:40:48 Using data directory /media/Ext160/Bitcoin/
2017-07-05 17:40:48 Using config file /media/Ext160/Bitcoin/bitcoin.conf
2017-07-05 17:40:48 Using at most 125 automatic connections (1024 file descriptors available)
2017-07-05 17:40:48 Using 32 MiB out of 32 requested for signature cache, able to store 1048576 elements
2017-07-05 17:40:48 Using 4 threads for script verification
2017-07-05 17:40:48 scheduler thread start
2017-07-05 17:40:48 Bound to [::]:8333
2017-07-05 17:40:48 Bound to 0.0.0.0:8333
2017-07-05 17:40:48 Cache configuration:
2017-07-05 17:40:48 * Using 2.0MiB for block index database
2017-07-05 17:40:48 * Using 8.0MiB for chain state database
2017-07-05 17:40:48 * Using 440.0MiB for in-memory UTXO set (plus up to 286.1MiB of unused mempool space)
2017-07-05 17:40:48 init message: Loading block index...
2017-07-05 17:40:48 Opening LevelDB in /media/Ext160/Bitcoin/blocks/index
2017-07-05 17:40:48 Opened LevelDB successfully
2017-07-05 17:40:48 Using obfuscation key for /media/Ext160/Bitcoin/blocks/index: 0000000000000000
2017-07-05 17:40:48 Opening LevelDB in /media/Ext160/Bitcoin/chainstate
2017-07-05 17:40:49 Opened LevelDB successfully
2017-07-05 17:40:49 Using obfuscation key for /media/Ext160/Bitcoin/chainstate: 26a31189c8470808
2017-07-05 17:41:15 LoadBlockIndexDB: last block file = 925
2017-07-05 17:41:15 LoadBlockIndexDB: last block file info: CBlockFileInfo(blocks=99, size=90529560, heights=474277...474374, time=2017-07-05...2017-07-05)
2017-07-05 17:41:15 Checking all blk files are present...
2017-07-05 17:41:16 LoadBlockIndexDB(): Block files have previously been pruned
2017-07-05 17:41:16 LoadBlockIndexDB: transaction index disabled
2017-07-05 17:41:17 LoadBlockIndexDB: hashBestChain=00000000000000000117dfa34fd2e03182ca2f3ca67ec56dfe11e96b2157cacd height=474374 date=2017-07-05 17:22:03 progress=0.999984
2017-07-05 17:41:17 init message: Rewinding blocks...
2017-07-05 17:41:26 init message: Verifying blocks...
2017-07-05 17:41:26 Verifying last 6 blocks at level 3
2017-07-05 17:41:26 [0%]...[16%]...[33%]...[50%]...[66%]...[83%]...[99%]...[DONE].
2017-07-05 17:45:57 No coin database inconsistencies in last 7 blocks (14995 transactions)
2017-07-05 17:45:57 block index 309325ms
2017-07-05 17:45:57 No wallet support compiled in!
2017-07-05 17:45:57 Unsetting NODE_NETWORK on prune mode
2017-07-05 17:45:57 init message: Pruning blockstore...
2017-07-05 17:45:57 mapBlockIndex.size() = 474376
2017-07-05 17:45:57 nBestHeight = 474374
2017-07-05 17:45:57 torcontrol thread start
2017-07-05 17:45:57 init message: Loading addresses...
2017-07-05 17:45:58 Loaded 42622 addresses from peers.dat 1155ms
2017-07-05 17:45:58 init message: Loading banlist...
2017-07-05 17:45:58 init message: Starting network threads...
2017-07-05 17:45:58 net thread start
2017-07-05 17:45:58 init message: Done loading
2017-07-05 17:45:58 dnsseed thread start
2017-07-05 17:45:58 addcon thread start
2017-07-05 17:45:58 msghand thread start
2017-07-05 17:45:58 opencon thread start
2017-07-05 17:45:58 GUI: Platform customization: "other"
2017-07-05 17:45:59 receive version message: /ViaBTC:bitpeer.0.2.0/: version 70012, blocks=0, us=0.0.0.0:0, peer=0
2017-07-05 17:45:59 Misbehaving: 54.191.174.46:49814 peer=0 (0 -> 1)
2017-07-05 17:45:59 ProcessMessages(headers, 82 bytes) FAILED peer=0
2017-07-05 17:46:05 receive version message: /Satoshi:0.14.1/: version 70015, blocks=474375, us=71.38.110.197:53317, peer=2
2017-07-05 17:46:09 Loading addresses from DNS seeds (could take a while)
2017-07-05 17:46:10 117 addresses found from DNS seeds
2017-07-05 17:46:10 dnsseed thread exit
2017-07-05 17:46:48 UpdateTip: new best=000000000000000000afd12a6c1dff66ecdd6d8c8c040741fc6cc8225b5437a3 height=474375 version=0x20000000 log2_work=86.709421 tx=237116126 date='2017-07-05 17:44:43' progress=0.999998 cache=5.3MiB(6342tx) warning='1 of last 100 blocks have unexpected version'
2017-07-05 17:46:48 receive version message: /Satoshi:0.13.1/: version 70014, blocks=474375, us=71.38.110.197:46165, peer=3
2017-07-05 17:46:50 receive version message: /Satoshi:0.14.0/: version 70015, blocks=474376, us=71.38.110.197:42938, peer=4
2017-07-05 17:47:34 UpdateTip: new best=0000000000000000015150f69bab844021dfa367dfe6aa7b9735e9ae1fb4c867 height=474376 version=0x20000002 log2_work=86.709455 tx=237118003 date='2017-07-05 17:46:44' progress=0.999999 cache=10.0MiB(12014tx) warning='1 of last 100 blocks have unexpected version'
2017-07-05 17:47:34 ProcessMessages(version, 178 bytes) FAILED peer=5
2017-07-05 17:47:41 receive version message: /Satoshi:0.14.0/: version 70015, blocks=474376, us=71.38.110.197:42844, peer=6
2017-07-05 17:47:46 receive version message: /Satoshi:0.14.0/: version 70015, blocks=474376, us=71.38.110.197:33340, peer=7
2017-07-05 17:47:53 receive version message: /Satoshi:0.14.1/: version 70015, blocks=474376, us=71.38.110.197:42480, peer=8
2017-07-05 17:47:53 receive version message: /Satoshi:0.13.1/: version 70014, blocks=474376, us=71.38.110.197:50384, peer=9
2017-07-05 17:47:54 receive version message: /Satoshi:0.14.99/: version 70015, blocks=474376, us=71.38.110.197:39142, peer=10
2017-07-05 17:47:58 connect() to 203.59.228.185:8333 failed after select(): No route to host (113)
2017-07-05 17:48:04 receive version message: /Satoshi:0.14.1(UASF-SegWit-BIP148)/: version 70015, blocks=474376, us=71.38.110.197:43780, peer=11
2017-07-05 17:49:42 receive version message: /bitnodes.21.co:0.1/: version 70015, blocks=474374, us=71.38.110.197:8333, peer=12
2017-07-05 17:50:37 connect() to 178.175.235.72:8333 failed after select(): Connection refused (111)
2017-07-05 17:51:04 receive version message: /Satoshi:0.14.0/: version 70015, blocks=474376, us=71.38.110.197:8333, peer=13
2017-07-05 17:51:04 receive version message: /bitnodes.21.co:0.1/: version 70015, blocks=474376, us=71.38.110.197:8333, peer=14
2017-07-05 17:56:35 receive version message: /bitnodes.21.co:0.1/: version 70015, blocks=474376, us=71.38.110.197:8333, peer=15
2017-07-05 17:58:22 receive version message: /Satoshi:0.13.1/: version 70014, blocks=474377, us=71.38.110.197:42265, peer=16
2017-07-05 17:59:03 Imported mempool transactions from disk: 1445 successes, 5478 failed, 0 expired
2017-07-05 17:59:10 UpdateTip: new best=0000000000000000008040bb8295419ac763910e74b8d5438b117c7c49bbf76f height=474377 version=0x20000002 log2_work=86.70949 tx=237119130 date='2017-07-05 17:52:32' progress=0.999995 cache=235.8MiB(37322tx) warning='1 of last 100 blocks have unexpected version'
2017-07-05 18:00:58 receive version message: /bitnodes.21.co:0.1/: version 70015, blocks=474377, us=71.38.110.197:8333, peer=17
2017-07-05 18:01:25 connect() to 115.206.30.167:8333 failed after select(): Connection refused (111)
2017-07-05 18:06:12 UpdateTip: new best=0000000000000000012a05d7bc7e306525ffcd155e5f0391e2677b2b3b013651 height=474378 version=0x20000002 log2_work=86.709525 tx=237121036 date='2017-07-05 18:06:12' progress=1.000000 cache=253.5MiB(42488tx) warning='1 of last 100 blocks have unexpected version'
2017-07-05 18:06:38 receive version message: /bitnodes.21.co:0.1/: version 70015, blocks=474377, us=71.38.110.197:8333, peer=19
2017-07-05 18:12:15 Pre-allocating up to position 0xc00000 in rev00925.dat
2017-07-05 18:12:16 UpdateTip: new best=00000000000000000078c2351965f436a97135ef46939ecae6acb832c1bff4f1 height=474379 version=0x20000000 log2_work=86.70956 tx=237122542 date='2017-07-05 18:12:04' progress=1.000000 cache=258.6MiB(46913tx) warning='1 of last 100 blocks have unexpected version'
2017-07-05 18:12:21 receive version message: /bitnodes.21.co:0.1/: version 70015, blocks=474378, us=71.38.110.197:8333, peer=21
2017-07-05 18:18:08 receive version message: /bitnodes.21.co:0.1/: version 70015, blocks=474379, us=71.38.110.197:8333, peer=22
2017-07-05 18:18:35 connect() to 200.31.4.105:8333 failed after select(): Connection refused (111)