In our SharePoint 2013 environment we are performing SQL ASlwaysOn activity. We have followed some msdn blogs

https://blogs.msdn.microsoft.com/sambetts/2015/04/24/setting-up-sharepoint-disaster-recovery-sites-with-sql-alwayson/

like this. and successfully failover our current database to DR site database . so now the application is in our current site and databses are moved to DR site. we checked our portal is up and working . but when we try to open Central Admin we get this error:

from the error it seems like it is the permission issue on the DR site database . but we checked the user permissions , the permissions are also the same as our current site database . we are using farm account which has Sysadmin permission on the database.

can someone suggest something for this?