Synology DS920 Synology High Availability SHA Troubleshooting Guide for DSM 7. - Page 25

Warning: Abnormal network connection [Details: Detected

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Chapter 2: SHA Troubleshooting 2.2.15 Warning: Abnormal cluster connection Warning Abnormal cluster connection. Suggestion: Please check network interface LAN X on both My_Active_Hostname (active server) and My_Passive_Hostname (passive server). Make sure the connection between the hosts and the switch is set up properly. If the problem persists, please use another Ethernet cable. Description The connection for the cluster interface LAN X is abnormal. The active and passive servers cannot communicate via LAN X. Cause The local network connection X between the two servers is abnormal or blocked. Resolution 1. Confirm the following items to make sure your servers can communicate via LAN X: • There are no hardware issues, such as loose cables, broken cables, or switch malfunctions. • Make sure that the cluster connection is not blocked by any network rules. • Synology High Availability services (Ports: 874, 5405, 5406, 7400-7499) are not blocked by your network's firewall settings. 2. If you are still unable to resolve the issue, refer to Chapter 3: Contact Customer Service to contact Synology Technical Support for further assistance. 2.2.16 Warning: Abnormal network connection [Details: Detected a conflict on the following high-availability cluster IP addresses: 10.17.X.X (LAN X).] Warning Abnormal network connection. Details: Detected a conflict on the following high-availability cluster IP addresses: 10.17.X.X (LAN X). Suggestion: Make sure high-availability cluster IP addresses 10.17.X.X (LAN X) are static, and each IP address is unique on the same network. Description The high-availability cluster IP address (LAN X) is being used by another host. Therefore, services using LAN X for connection are affected. Cause Cause 1: The high-availability cluster IP address may be incorrectly set to an address in the DHCP range. If other hosts happen to be assigned to the same IP address, there will be an IP conflict. Cause 2: If the two servers cannot communicate or detect each other, the passive server will automatically become the active server. In this case, there will be two active servers providing services and using the same highavailability cluster IP address, resulting in IP conflict. 23

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Chapter 2: SHA Troubleshooting
2.2.15 Warning: Abnormal cluster connection
Warning
Abnormal cluster connection.
Suggestion
: Please check network interface LAN X on both My_Active_Hostname (active
server) and My_Passive_Hostname (passive server). Make sure the connection between the
hosts and the switch is set up properly. If the problem persists, please use another Ethernet
cable.
Description
The connection for the cluster interface LAN X is abnormal. The active and
passive servers cannot communicate via LAN X.
Cause
The local network connection X between the two servers is abnormal or
blocked.
Resolution
1. Confirm the following items to make sure your servers can communicate
via LAN X:
• There are no hardware issues, such as loose cables, broken cables, or
switch malfunctions.
• Make sure that the cluster connection is not blocked by any network
rules.
• Synology High Availability services (Ports: 874, 5405, 5406, 7400-7499)
are not blocked by your network’s firewall settings.
2. If you are still unable to resolve the issue, refer to
Chapter 3: Contact
Customer Service
to contact Synology Technical Support for further
assistance.
2.2.16 Warning: Abnormal network connection [Details: Detected a
conflict on the following high-availability cluster IP addresses: 10.17.X.X
(LAN X).]
Warning
Abnormal network connection.
Details
: Detected a conflict on the following high-availability cluster IP addresses: 10.17.X.X
(LAN X).
Suggestion
: Make sure high-availability cluster IP addresses 10.17.X.X (LAN X) are static, and
each IP address is unique on the same network.
Description
The high-availability cluster IP address (LAN X) is being used by another
host. Therefore, services using LAN X for connection are affected.
Cause
Cause 1
: The high-availability cluster IP address may be incorrectly set to
an address in the DHCP range. If other hosts happen to be assigned to the
same IP address, there will be an IP conflict.
Cause 2
: If the two servers cannot communicate or detect each other, the
passive server will automatically become the active server. In this case,
there will be two active servers providing services and using the same high-
availability cluster IP address, resulting in IP conflict.