HA not SYNC in primary and secondry firewall (401E)

[RHFLMPLS]

The primary firewall was restarted, causing the secondary unit to become the primary. However, it is not syncing with the primary, and both HA cables are active.

[AEK]

Under menu System > HA, put the mouse cursor on the not-synced node, you will see which config section is causing the issue.

Then compare this section between the two nodes, correct it, then run the following:

diagnose sys ha checksum recalculate 

[Toshi_Esumi]

This is the KB for the troubleshooting process.
https://community.fortinet.com/t5/FortiGate/Troubleshooting-Tip-How-to-troubleshoot-HA-synchronizati...

Toshi

[dingjerry_FTNT]

Hi @RHFLMPLS ,

When you are talking about an HA issue, it's better to use Unit A and Unit B for the HA cluster members.

For example, your issue can be rephrased as below:

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I have HA cluster, A was Primary and B was Secondary.  After A was restarted, B is Primary now. However, A is not syncing with the B device and both HA cables are active.

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Usually, FGT HA needs to take time to sync up.  If you still see them not in sync, please use the methods provided by @Toshi_Esumi and @AEK  to collect more info.