Always ON – Failed to join database to Availability group

Environment

-> Setting up Always ON,

-> It completed fine. Lets look at the Always ON dashboard,

-> Even though the wizard did not give any errors. The secondaries are not sync and databases are still in restoring mode.

-> Checking the status using below query,

select r.replica_server_name, r.endpoint_url,
rs.connected_state_desc, rs.last_connect_error_description, 
rs.last_connect_error_number, rs.last_connect_error_timestamp 
from sys.dm_hadr_availability_replica_states rs join sys.availability_replicas r
on rs.replica_id=r.replica_id
where rs.is_local=1
GO

Error Message,
Connection attempt failed with error: ‘10060(A connection attempt failed because the connected party did not properly respond after a period of time, or established connection failed because connected host has failed to respond.)’.

-> Checking SQL Server errorlog,

Synchronous Secondary – JBSAG2

2020-07-12 16:16:30.730 spid31s Starting up database ‘JBDB’.
2020-07-12 16:16:30.730 spid31s The database ‘JBDB’ is marked RESTORING and is in a state that does not allow recovery to be run.
2020-07-12 16:16:30.750 spid48s The state of the local availability replica in availability group ‘JBSAG’ has changed from ‘RESOLVING_NORMAL’ to ‘NOT_AVAILABLE’. The state changed because either the associated availability group has been deleted, or the local availability replica has been removed from another SQL Server instance. For more information, see the SQL Server error log or cluster log. If this is a Windows Server Failover Clustering (WSFC) availability group, you can also see the WSFC management console.
2020-07-12 16:25:35.710 spid52 The state of the local availability replica in availability group ‘JBSAG’ has changed from ‘NOT_AVAILABLE’ to ‘RESOLVING_NORMAL’. The state changed because the local availability replica is joining the availability group. For more information, see the SQL Server error log or cluster log. If this is a Windows Server Failover Clustering (WSFC) availability group, you can also see the WSFC management console.
2020-07-12 16:25:35.920 spid35s The state of the local availability replica in availability group ‘JBSAG’ has changed from ‘RESOLVING_NORMAL’ to ‘SECONDARY_NORMAL’. The state changed because the availability group state has changed in Windows Server Failover Clustering (WSFC). For more information, see the SQL Server error log or cluster log. If this is a Windows Server Failover Clustering (WSFC) availability group, you can also see the WSFC management console.
2020-07-12 16:25:45.930 spid36s A connection timeout has occurred while attempting to establish a connection to availability replica ‘JBSAG1’ with id [850DE16E-2C2B-43B1-BF52-6D8C5E2046FF]. Either a networking or firewall issue exists, or the endpoint address provided for the replica is not the database mirroring endpoint of the host server instance.
2020-07-12 16:26:12.480 spid52 Starting up database ‘JBDB’.
2020-07-12 16:26:12.490 spid52 The database ‘JBDB’ is marked RESTORING and is in a state that does not allow recovery to be run.

Asynchronous Secondary – JBSAG3

2020-07-12 16:25:47.000 spid57s A connection timeout has occurred while attempting to establish a connection to availability replica ‘JBSAG1’ with id [850DE16E-2C2B-43B1-BF52-6D8C5E2046FF]. Either a networking or firewall issue exists, or the endpoint address provided for the replica is not the database mirroring endpoint of the host server instance.
2020-07-12 16:26:47.060 spid53 Starting up database ‘JBDB’.
2020-07-12 16:26:47.070 spid53 The database ‘JBDB’ is marked RESTORING and is in a state that does not allow recovery to be run.

-> The error message refers to a connection issue between the primary and secondaries.

-> Endpoint uses port 5022. Lets check if port 5022 is not blocked using telnet.

‘telnet’ is not recognized as an internal or external command,
operable program or batch file.

-> Execute below command in powershell to enable telnet.

Install-WindowsFeature -name Telnet-Client

-> Telnet is not working for port 5022. It proves that port 5022 is not open.

-> Let us create a firewall rule to open port 5022.

-> Open “Windows Firewall with Advanced Security” and open “Inbound Rules” on JBSAG1, JBSAG2 and JBSAG3.

-> Once the port 5022 is opened. Lets try joining the secondary database as below,

-> Checking the Status now,

-> Executing below query,

select r.replica_server_name, r.endpoint_url,
rs.connected_state_desc, rs.last_connect_error_description, 
rs.last_connect_error_number, rs.last_connect_error_timestamp 
from sys.dm_hadr_availability_replica_states rs join sys.availability_replicas r
on rs.replica_id=r.replica_id
where rs.is_local=1
GO

-> It works fine now.

Thank You,
Vivek Janakiraman

Disclaimer:
The views expressed on this blog are mine alone and do not reflect the views of my company or anyone else. All postings on this blog are provided “AS IS” with no warranties, and confers no rights.

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