rcp problem
 

I have two RH server ( server A and server B ) , I use rcp command to transfer file ( from server A to server B ) , but I found sometimes the file can't transfer to server B , I use rcp user@remoteserver:/path , it is strange that when I use this command to transfer file ( continously ) , the first and second is successful , the third one must fail ( the error : connection time out ) , then I wait for 1 minute to try , then I can transfer it , in shortly , I can only continously rcp two times , then I have to wait 1 minute ( around 1 minute ) , can advise what is wrong in my system ? thx