File Replication Service (FRS) is used for synchronising the SYSVOL shared folders on domain controllers and for synchronising DFS link targets on servers running Windows.
Recently i had a DC that was strangely not replicating policies over a WAN link.
after scratching our heads and looking over very long and boring event logs from the server and SCOM i download a tool called SONAR, free download from Microsoft <HERE>.
this spotted strangely the SYSVOL share had been unshared…….. Strange but true,,, anyway without this tool it would have taken several hours longer and more scratching my head over event logs.
Download it and see for your self. Worth its weight in gold.