You must establish login names and passwords for the various components of the Replication Server system, including RSSDs, RepAgent, the ID Server, and Replication Server.
Often, one process must log in to another, remote process. In such cases, the login name and password assigned to the process logging in must also exist at the remote process. If a password used to log in to the remote process is changed at the current process only, login attempts fail.
As a general rule, if you are specifying or modifying system login names, keep the names unique. If you use the same login name for different roles, then any time you change the password, many of the dependencies described in this section are affected.