intune ad connector stopped sync suddenly

we have two Intune AD connectors configured on dedicated win 2016 servers. the servers were working fine until Sunday (successful deployment was done on Friday and last sync is on Sunday morning), however now this is failing to sync to Intune. The server still has internet access and the config file updates for proxy setting is still in place. is there any other option to check why it suddenly stopped working. the server event logs are filled with 30122 error logs as below but the proxy configuration is already in place for this.

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Crystal-MSFT · Oct 13, 2020 at 04:23 AM

@svjs-0437 From your description, it seems Intune AD connector is not synced. Could you confirm is it Intune connector or Azure AD connector? What is affected with the Sync?

Meanwhile, for the event , based on my research, I find some similar links. One is fixed with DNS and the other is install Intune connector on other server instead of DC:
https://techcommunity.microsoft.com/t5/microsoft-intune/hybrid-setup-failure-event-id-30122/m-p/1405520
https://www.reddit.com/r/Intune/comments/fgiyno/autopilot_hybrid_ad_join_failed_error_80180005/
Note: Non-microsoft link, just for the reference.

Please check the above information to see if it can help. If there's anything unclear, feel free to let us know.

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svjs-0437 Crystal-MSFT · Oct 13, 2020 at 06:37 AM

this is intune AD connector for hybrid AAD join autopilot activity and as updated these are not on DC server

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Crystal-MSFT svjs-0437 · Oct 13, 2020 at 07:17 AM

@svjs-0437, Thanks for the reply.

For our issue, please check the Intune Connector for Active Directory status in Intune portal. Is it active now?

Also check if the password of the account we used to sign in Intune connection has changed and sign in again to see if the sync will work well.

Hope it can help.

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