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Is it possible to have two SQL Always on High Availability servers in datacentre A replicating to two servers in datacentre B with one Witness using Express with two availability groups (one for each server in Datacentre A/B) on Linux? I tried it but I'm having problems so i am not sure if it is what im doing or is it because it cannot be done and I will need two SQL Express Witness servers?

In addition, all servers are running on Linux Ubuntu

On the SQL Express I'm executing the command ALTER AVAILABILITY GROUP [ag2] JOIN WITH (CLUSTER_TYPE = EXTERNAL) and receiving the following error:

Msg 47106, Level 16, State 3, Line 125 Cannot join availability group 'ag2'. Download configuration timeout. Please check primary configuration, network connectivity and firewall setup, then retry the operation. Msg 41158, Level 16, State 3, Line 125 Failed to join local availability replica to availability group 'ag2'. The operation encountered SQL Server error 47106 and has been rolled back. Check the SQL Server error log for more details. When the cause of the error has been resolved, retry the ALTER AVAILABILITY GROUP JOIN command.

If I uninstall SQL Express and reinstall and then execute ALTER AVAILABILITY GROUP [ag1] JOIN WITH (CLUSTER_TYPE = EXTERNAL) it takes about 30-40 seconds and works. It is just when I trying to connect to [ag2].

All servers can ping each other.

Thanks

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