You are currently working on upgrading to K2 Five from 4.7. The upgrade will fail on the K2 Server step and you will get some of the below errors in the InstallerTrace logs:
"AuthorizationBase.Execute: Logged Error: Failed: System.Net.Sockets.SocketException (0x80004005): No connection could be made because the target machine actively refused it 127.0.0.1:5555"
"ActionGroup.Execute: Logged Error: Target failed to execute: RegisterIdentity ActionGroup.Execute: Logged Error: Target failed to execute: RegisterRole"
"Component.ExecuteTarget: Logged Error: Target did not complete successfully: Management.kspx"
This is currently a known issue within the K2 product. For now the recommended workaround is to update the service account password to remove any special characters. Follow these steps for this workaround:
1. Update the K2 Service account in Active Directory to no longer have special characters.
2. If logged into the server as this same service account, log out and then back in. Credentials for the old password will be cached and you will not be able to get past the page on the setup manager for the DB connections.
3. Run a repair via the K2 Setup Manager.
If you find that the Service Account is still getting locked out in Active Directory after you made a change to the password using the above steps, refer to the following KB for other common places the old password could still exist: http://help.k2.com/support-services/kbt137088