When you connect to Decision Center, a connection file (.syncEntries) is created in your workspace for the project.
This connection file keeps track of the state of the synchronization with one or more Decision Center, if you are connecting to more than one.
You must keep this entry to retain the 3-way comparison that gives you the state of the synchronization.
When you close your Eclipse session, the connection file remains in your workspace, so you do not need to reconnect the next time you open Designer.
When you disconnect from one Decision Center to connect to another one, you must keep the connection file of the first, unless you plan on never reconnecting:
If you delete the connection entry and later reconnect and synchronize with the same project, the Synchronize view displays conflicts even though the rules are the same on both sides, because you lose the checksum information when you delete the entry. In this case, you can delete the project in Designer and re-import it from Decision Center.
Consequently, only delete the connection entry if you do not need to reconnect, or if you want to clean the connection files, such as when sending a rule project (not the workspace) to another user.
The dialog gives you the choice of deleting the entries for the current server or for all the servers at once.