Here's the error log from the FiiO X5. It looks like it's trying to connect to every device on my network. And being refused by all of them. It should only be trying to connect to 192.168.1.101, which isn't showing in the error log. Note that the log seems to contain more than one attempt to connect.
Feb 15, 2019 8:52:43 AM com.getmusicbee.musicbeewifisync.ErrorHandler LogInfo
INFO: FindCandidate: Probing 192.168.1.
Feb 15, 2019 8:52:46 AM com.getmusicbee.musicbeewifisync.ErrorHandler LogInfo
INFO: FindCandidate: 192.168.1.1
Feb 15, 2019 8:52:46 AM com.getmusicbee.musicbeewifisync.ErrorHandler LogInfo
INFO: FindCandidate: 192.168.1.2
Feb 15, 2019 8:52:46 AM com.getmusicbee.musicbeewifisync.ErrorHandler LogInfo
INFO: FindCandidate: 192.168.1.10
Feb 15, 2019 8:52:46 AM com.getmusicbee.musicbeewifisync.ErrorHandler LogInfo
INFO: FindCandidate: 192.168.1.11
Feb 15, 2019 8:52:46 AM com.getmusicbee.musicbeewifisync.ErrorHandler LogInfo
INFO: FindCandidate: 192.168.1.103
Feb 15, 2019 8:52:46 AM com.getmusicbee.musicbeewifisync.ErrorHandler LogInfo
INFO: FindCandidate: 192.168.1.202
Feb 15, 2019 8:52:46 AM com.getmusicbee.musicbeewifisync.ErrorHandler LogInfo
INFO: FindCandidate: 192.168.1.201
Feb 15, 2019 8:52:46 AM com.getmusicbee.musicbeewifisync.ErrorHandler LogInfo
INFO: FindCandidate: 192.168.1.115
Feb 15, 2019 8:53:16 AM com.getmusicbee.musicbeewifisync.ErrorHandler LogInfo
INFO: Ping: 192.168.1.1
Feb 15, 2019 8:53:16 AM com.getmusicbee.musicbeewifisync.ErrorHandler LogError
SEVERE: Ping: failed to connect to /192.168.1.1 (port 27304) after 2500ms: isConnected failed: ECONNREFUSED (Connection refused)
Feb 15, 2019 8:53:16 AM com.getmusicbee.musicbeewifisync.ErrorHandler LogInfo
INFO: Ping: 192.168.1.2
Feb 15, 2019 8:53:16 AM com.getmusicbee.musicbeewifisync.ErrorHandler LogError
SEVERE: Ping: failed to connect to /192.168.1.2 (port 27304) after 2500ms: isConnected failed: ECONNREFUSED (Connection refused)
Feb 15, 2019 8:53:16 AM com.getmusicbee.musicbeewifisync.ErrorHandler LogInfo
INFO: Ping: 192.168.1.10
Feb 15, 2019 8:53:16 AM com.getmusicbee.musicbeewifisync.ErrorHandler LogError
SEVERE: Ping: failed to connect to /192.168.1.10 (port 27304) after 2500ms: isConnected failed: ECONNREFUSED (Connection refused)
Feb 15, 2019 8:53:16 AM com.getmusicbee.musicbeewifisync.ErrorHandler LogInfo
INFO: Ping: 192.168.1.11
Feb 15, 2019 8:53:16 AM com.getmusicbee.musicbeewifisync.ErrorHandler LogError
SEVERE: Ping: failed to connect to /192.168.1.11 (port 27304) after 2500ms: isConnected failed: ECONNREFUSED (Connection refused)
Feb 15, 2019 8:53:16 AM com.getmusicbee.musicbeewifisync.ErrorHandler LogInfo
INFO: Ping: 192.168.1.103
Feb 15, 2019 8:53:16 AM com.getmusicbee.musicbeewifisync.ErrorHandler LogError
SEVERE: Ping: failed to connect to /192.168.1.103 (port 27304) after 2500ms: isConnected failed: ECONNREFUSED (Connection refused)
Feb 15, 2019 8:53:16 AM com.getmusicbee.musicbeewifisync.ErrorHandler LogInfo
INFO: Ping: 192.168.1.202
Feb 15, 2019 8:53:16 AM com.getmusicbee.musicbeewifisync.ErrorHandler LogError
SEVERE: Ping: failed to connect to /192.168.1.202 (port 27304) after 2500ms: isConnected failed: ECONNREFUSED (Connection refused)
Feb 15, 2019 8:53:16 AM com.getmusicbee.musicbeewifisync.ErrorHandler LogInfo
INFO: Ping: 192.168.1.201
Feb 15, 2019 8:53:16 AM com.getmusicbee.musicbeewifisync.ErrorHandler LogError
SEVERE: Ping: failed to connect to /192.168.1.201 (port 27304) after 2500ms: isConnected failed: ECONNREFUSED (Connection refused)
Feb 15, 2019 8:53:16 AM com.getmusicbee.musicbeewifisync.ErrorHandler LogInfo
INFO: Ping: 192.168.1.115
Feb 15, 2019 8:53:17 AM com.getmusicbee.musicbeewifisync.ErrorHandler LogError
SEVERE: Ping: failed to connect to /192.168.1.115 (port 27304) after 2500ms: isConnected failed: ECONNREFUSED (Connection refused)
Feb 15, 2019 8:55:19 AM com.getmusicbee.musicbeewifisync.ErrorHandler LogInfo
INFO: Ping: 192.168.1.1
Feb 15, 2019 8:55:19 AM com.getmusicbee.musicbeewifisync.ErrorHandler LogError
SEVERE: Ping: failed to connect to /192.168.1.1 (port 27304) after 2500ms: isConnected failed: ECONNREFUSED (Connection refused)
Feb 15, 2019 8:55:19 AM com.getmusicbee.musicbeewifisync.ErrorHandler LogInfo
INFO: Ping: 192.168.1.2
Feb 15, 2019 8:55:19 AM com.getmusicbee.musicbeewifisync.ErrorHandler LogError
SEVERE: Ping: failed to connect to /192.168.1.2 (port 27304) after 2500ms: isConnected failed: ECONNREFUSED (Connection refused)
Feb 15, 2019 8:55:19 AM com.getmusicbee.musicbeewifisync.ErrorHandler LogInfo
INFO: Ping: 192.168.1.10
Feb 15, 2019 8:55:19 AM com.getmusicbee.musicbeewifisync.ErrorHandler LogError
SEVERE: Ping: failed to connect to /192.168.1.10 (port 27304) after 2500ms: isConnected failed: ECONNREFUSED (Connection refused)
Feb 15, 2019 8:55:19 AM com.getmusicbee.musicbeewifisync.ErrorHandler LogInfo
INFO: Ping: 192.168.1.11
Feb 15, 2019 8:55:19 AM com.getmusicbee.musicbeewifisync.ErrorHandler LogError
SEVERE: Ping: failed to connect to /192.168.1.11 (port 27304) after 2500ms: isConnected failed: ECONNREFUSED (Connection refused)
Feb 15, 2019 8:55:19 AM com.getmusicbee.musicbeewifisync.ErrorHandler LogInfo
INFO: Ping: 192.168.1.103
Feb 15, 2019 8:55:19 AM com.getmusicbee.musicbeewifisync.ErrorHandler LogError
SEVERE: Ping: failed to connect to /192.168.1.103 (port 27304) after 2500ms: isConnected failed: ECONNREFUSED (Connection refused)
Feb 15, 2019 8:55:19 AM com.getmusicbee.musicbeewifisync.ErrorHandler LogInfo
INFO: Ping: 192.168.1.202
Feb 15, 2019 8:55:19 AM com.getmusicbee.musicbeewifisync.ErrorHandler LogError
SEVERE: Ping: failed to connect to /192.168.1.202 (port 27304) after 2500ms: isConnected failed: ECONNREFUSED (Connection refused)
Feb 15, 2019 8:55:19 AM com.getmusicbee.musicbeewifisync.ErrorHandler LogInfo
INFO: Ping: 192.168.1.201
Feb 15, 2019 8:55:20 AM com.getmusicbee.musicbeewifisync.ErrorHandler LogError
SEVERE: Ping: failed to connect to /192.168.1.201 (port 27304) after 2500ms: isConnected failed: ECONNREFUSED (Connection refused)
Feb 15, 2019 8:55:20 AM com.getmusicbee.musicbeewifisync.ErrorHandler LogInfo
INFO: Ping: 192.168.1.115
Feb 15, 2019 8:55:21 AM com.getmusicbee.musicbeewifisync.ErrorHandler LogError
SEVERE: Ping: failed to connect to /192.168.1.115 (port 27304) after 2500ms: isConnected failed: ECONNREFUSED (Connection refused)
Feb 15, 2019 8:56:09 AM com.getmusicbee.musicbeewifisync.ErrorHandler LogInfo
INFO: Ping: 192.168.1.1
Feb 15, 2019 8:56:09 AM com.getmusicbee.musicbeewifisync.ErrorHandler LogError
SEVERE: Ping: failed to connect to /192.168.1.1 (port 27304) after 2500ms: isConnected failed: ECONNREFUSED (Connection refused)
Feb 15, 2019 8:56:09 AM com.getmusicbee.musicbeewifisync.ErrorHandler LogInfo
INFO: Ping: 192.168.1.2
Feb 15, 2019 8:56:09 AM com.getmusicbee.musicbeewifisync.ErrorHandler LogError
SEVERE: Ping: failed to connect to /192.168.1.2 (port 27304) after 2500ms: isConnected failed: ECONNREFUSED (Connection refused)
Feb 15, 2019 8:56:09 AM com.getmusicbee.musicbeewifisync.ErrorHandler LogInfo
INFO: Ping: 192.168.1.10
Feb 15, 2019 8:56:09 AM com.getmusicbee.musicbeewifisync.ErrorHandler LogError
SEVERE: Ping: failed to connect to /192.168.1.10 (port 27304) after 2500ms: isConnected failed: ECONNREFUSED (Connection refused)
Feb 15, 2019 8:56:09 AM com.getmusicbee.musicbeewifisync.ErrorHandler LogInfo
INFO: Ping: 192.168.1.11
Feb 15, 2019 8:56:09 AM com.getmusicbee.musicbeewifisync.ErrorHandler LogError
SEVERE: Ping: failed to connect to /192.168.1.11 (port 27304) after 2500ms: isConnected failed: ECONNREFUSED (Connection refused)
Feb 15, 2019 8:56:09 AM com.getmusicbee.musicbeewifisync.ErrorHandler LogInfo
INFO: Ping: 192.168.1.103
Feb 15, 2019 8:56:09 AM com.getmusicbee.musicbeewifisync.ErrorHandler LogError
SEVERE: Ping: failed to connect to /192.168.1.103 (port 27304) after 2500ms: isConnected failed: ECONNREFUSED (Connection refused)
Feb 15, 2019 8:56:09 AM com.getmusicbee.musicbeewifisync.ErrorHandler LogInfo
INFO: Ping: 192.168.1.202
Feb 15, 2019 8:56:09 AM com.getmusicbee.musicbeewifisync.ErrorHandler LogError
SEVERE: Ping: failed to connect to /192.168.1.202 (port 27304) after 2500ms: isConnected failed: ECONNREFUSED (Connection refused)
Feb 15, 2019 8:56:09 AM com.getmusicbee.musicbeewifisync.ErrorHandler LogInfo
INFO: Ping: 192.168.1.201
Feb 15, 2019 8:56:09 AM com.getmusicbee.musicbeewifisync.ErrorHandler LogError
SEVERE: Ping: failed to connect to /192.168.1.201 (port 27304) after 2500ms: isConnected failed: ECONNREFUSED (Connection refused)
Feb 15, 2019 8:56:09 AM com.getmusicbee.musicbeewifisync.ErrorHandler LogInfo
INFO: Ping: 192.168.1.115
Feb 15, 2019 8:56:11 AM com.getmusicbee.musicbeewifisync.ErrorHandler LogError
SEVERE: Ping: failed to connect to /192.168.1.115 (port 27304) after 2500ms