If you designate as the active database a database that was previously added to the replication system, the RepAgent thread for the active database shuts down when you create the logical connection.
Reconfigure RepAgent with sp_config_rep_agent, setting the send_warm_standby_xacts configuration parameter.
Restart RepAgent.
For information about how to configure and start RepAgent, refer to “Setting up RepAgent” on page 116 in the Replication Server Administration Guide Volume 1. Refer to the Replication Server Reference Manual for more information about the sp_config_rep_agent system procedure.