I restarted RoonServer on the Centos7 box and then restart RoonRemote on OS X. Here’s the log - 10.0.20.144 is the IP of the Mac so RoonServer is seeing some sort of client connection…
[root@fuggles Logs]# cat RoonServer_log.txt
12/30 06:16:17 Info: Starting RoonServer v1.2 (build 165) stable on linuxx64
12/30 06:16:17 Trace: Checking if we are already running
12/30 06:16:17 Trace: Nope, we are the only one running
12/30 06:16:17 Info: Is 64 bit? True
12/30 06:16:17 Info: Command Line Argument: -watchdogport=36591
12/30 06:16:17 Info: [media] resolved oop decoder to /usr/bin/ffmpeg
12/30 06:16:17 Trace: [realtime] fetching time from NTP server
12/30 06:16:17 Info: [broker] starting fe57d355-a82f-4b44-8a81-4afb03241360
12/30 06:16:17 Info: [broker/locations] added location ‘Internet Media’ (Type=Internet) [e268f098-04c4-4e65-af3f-38ba3c3fcecb]
12/30 06:16:17 Info: [broker/locations] Status changed: ‘Internet Media’ (Type=Internet) [e268f098-04c4-4e65-af3f-38ba3c3fcecb] is online
12/30 06:16:17 Info: [broker/locations] added location ‘Metadata Service’ (Type=MetadataService) [13769258-b70b-4243-b1d6-bd46e8257ba8]
12/30 06:16:17 Info: [broker/locations] Status changed: ‘Metadata Service’ (Type=MetadataService) [13769258-b70b-4243-b1d6-bd46e8257ba8] is online
12/30 06:16:17 Info: [broker/locations] added location ‘Offline’ (Type=Offline) [f1e4b43f-f643-47ba-b875-fd93b32a6006]
12/30 06:16:17 Info: [broker/locations] location ‘Offline’ (Type=Offline) [f1e4b43f-f643-47ba-b875-fd93b32a6006] is offline
12/30 06:16:17 Trace: [brokerserver] Enabling broker server
12/30 06:16:17 Info: [broker/distributed] HTTP server listening on port 9100
12/30 06:16:17 Trace: [broker/backups] initializing
12/30 06:16:17 Trace: [broker/accounts] file not found
12/30 06:16:17 Trace: [realtime] Got time from NTP: 12/30/2016 1:16:17 PM (3692092577938ms)
12/30 06:16:17 Trace: [broker/accounts] Data updated. AccountStatus=NoAccountConfigured MachineStatus=NeedsAccount UserId=
12/30 06:16:17 Trace: [realtime] Updated clock skew to -00:00:00.0452170 (-45.217ms)
12/30 06:16:18 Info: [libraryapi] loaded first run time 12/30/2016 2:00:29 AM
12/30 06:16:18 Info: [transport/raatserver] [runner] Start or Connect…
12/30 06:16:18 Info: ConnectOrStartAndWaitForExit RAATServer
12/30 06:16:18 Info: [broker/dropbox] no account configured
12/30 06:16:18 Info: [transport/raatserver] [runner] Status: Started
12/30 06:16:18 Info: connected to watchdogport: 36591
12/30 06:16:18 Info: [remoting] loaded protocol hash 6508e918f0f11c137dc6cd1f4e4158254a23878e from /opt/RoonServer/Appliance/Roon.Broker.Api.Remote.dll
12/30 06:16:18 Info: [broker/distributed] Remoting server listening on port 9101
12/30 06:16:18 Trace: [geoip] GET XXX
12/30 06:16:18 Trace: [httpcache] loaded 0 cache entries from /var/roon/RoonServer/Cache/httpcache_2.db, current: 0mb / 128mb
12/30 06:16:18 Info: [music] first pass through media thread is done
12/30 06:16:18 Info: [loadstatus] IsLibraryLoading True => False
12/30 06:16:18 Info: [transport] initializing
12/30 06:16:18 Info: [loadstatus] IsTransportLoading True => False
12/30 06:16:18 Info: [loadstatus] IsStartup True => False
XXX
12/30 06:16:18 Info: [stats] 1584mb Virtual, 59mb Physical, 3mb Managed, 0 Handles, 23 Threads
12/30 06:16:28 Trace: Successful POST response from https://push.roonlabs.com/push/1/connect
12/30 06:16:28 Trace: [push] connecting to 54.81.187.216:9200
12/30 06:16:28 Trace: [push] connected
12/30 06:16:33 Info: [stats] 1987mb Virtual, 79mb Physical, 14mb Managed, 0 Handles, 29 Threads
12/30 06:16:47 Trace: [appupdater] initial check for updates
12/30 06:16:47 Debug: Checking for updates: XXX
12/30 06:16:48 Debug: [appupdater] Update not needed
12/30 06:16:48 Info: [stats] 2053mb Virtual, 80mb Physical, 14mb Managed, 0 Handles, 30 Threads
12/30 06:16:49 Info: Flushing kart data to server
12/30 06:16:50 Debug: server said:
12/30 06:17:03 Info: [stats] 2054mb Virtual, 81mb Physical, 15mb Managed, 0 Handles, 28 Threads
12/30 06:17:18 Info: [stats] 2054mb Virtual, 81mb Physical, 15mb Managed, 0 Handles, 28 Threads
12/30 06:17:24 Info: [brokerserver] Client connected: 10.0.20.15:61024
12/30 06:17:24 Trace: [SOOD] Adding User IP 10.0.20.15
12/30 06:17:24 Warn: [remotingserver] failed to deserialize message: FSE.InvalidDocumentVersionException: Invalid FSE Document Version: 539959368
at FSE.BinaryReader.Read () [0x00271] in /home/roon/roon/fse/csharp/fse_binreader.cs:411
at Messaging.FSEMessageDecoder.DecodeCommon (System.Int32& requestId, System.Boolean& isFinal) [0x0009a] in /home/roon/roon/messaging/csharp/Messaging/messaging_fse.cs:161
at Messaging.FSEMessageDecoder.DecodeMessage () [0x00000] in /home/roon/roon/messaging/csharp/Messaging/messaging_fse.cs:202
at Messaging.FSEMessageDecodeSession.DecodeBinaryMessage (System.Byte[] s) [0x00039] in /home/roon/roon/messaging/csharp/Messaging/messaging_fse.cs:321
at Messaging.FSEMessageHelper.DecodeBinaryMessage (System.Byte[] s) [0x00014] in /home/roon/roon/messaging/csharp/Messaging/messaging_fse.cs:379
at Sooloos.Broker.Remoting.RemotingServer.OnRequestReceived (System.Int32 cmd, System.Nullable`1[T] rid, System.Byte[] body) [0x00118] in /home/roon/roon/Broker/Remoting/remoting_server.cs:118
12/30 06:17:24 Warn: [remotingserver] unrecognized server cmd 32
12/30 06:17:24 Warn: [remotingserver] unrecognized server cmd 19
12/30 06:17:24 Warn: [remotingserver] unrecognized server cmd 48
12/30 06:17:24 Warn: [remotingserver] unrecognized server cmd 39
12/30 06:17:24 Warn: [remotingserver] unrecognized server cmd 32
12/30 06:17:24 Warn: [remotingserver] unrecognized server cmd 37
12/30 06:17:24 Warn: [remotingserver] unrecognized server cmd 46
12/30 06:17:24 Warn: [remotingserver] unrecognized server cmd 47
12/30 06:17:24 Warn: [remotingserver] unrecognized server cmd 9
12/30 06:17:24 Warn: [remotingserver] unrecognized server cmd 47
12/30 06:17:25 Info: [brokerserver] Client connected: 10.0.20.15:61025
12/30 06:17:25 Trace: [SOOD] Adding User IP 10.0.20.15
12/30 06:17:33 Info: [stats] 2057mb Virtual, 108mb Physical, 16mb Managed, 0 Handles, 30 Threads
12/30 06:17:48 Info: [stats] 2057mb Virtual, 108mb Physical, 16mb Managed, 0 Handles, 29 Threads
12/30 06:18:03 Info: [stats] 2057mb Virtual, 108mb Physical, 16mb Managed, 0 Handles, 29 Threads
12/30 06:18:12 Info: [brokerserver] Client disconnected: 10.0.20.15:61025
12/30 06:18:18 Info: [stats] 2057mb Virtual, 108mb Physical, 17mb Managed, 0 Handles, 28 Threads
12/30 06:18:33 Info: [stats] 2058mb Virtual, 109mb Physical, 17mb Managed, 0 Handles, 28 Threads
12/30 06:18:48 Info: [stats] 2058mb Virtual, 109mb Physical, 17mb Managed, 0 Handles, 28 Threads
12/30 06:19:03 Info: [stats] 2058mb Virtual, 109mb Physical, 17mb Managed, 0 Handles, 28 Threads
12/30 06:19:18 Info: [stats] 2058mb Virtual, 109mb Physical, 18mb Managed, 0 Handles, 28 Threads