Informix replication (7.13.UC3) questions and problems

Hello, I have some questions and problems with replication with Online 7.13.UC3. 1) Does sombody know why the .rhosts file of informix user must contain an entry for informix user of the other system on both servers ? Informix tech-support in France told me that it is necessary but the person didn't remember why. 2) Every week since the installation, the replication fails and stops for no obvious reason, and when I have a look on both machines, I notice that the primary server is OK in On-line (Prim) mode but the other one is in online standard mode and the replication is down. The only solution I found is to restore the secondary server with the backup file of the primary one and to restart the replication from the beginning. At the moment the amount of datas is low but it will growth. I can't do this every week because I loose 3 hours each time. Did somebody experience this kind of trouble ? Can someone help me on this problem ? Thanks. Jean-Francois.