Checking RFC destination availability

Hello,

In a transaction I'm working on, I loop at a table containing RFC destinations, and I call the same function module on each of these destinations. What I would like to do is, prior to the call, test if the system behind the RFC destination is available (neither completely crashed, nor just blocked by an administrator).

I tried to do this by simply calling any BAPI on the remote system, and check if there was a connection error. But the problem is, if the system is not down but just blocked by an administrator, the transaction suddenly displays the logon page of the remote system.

Do you know of a simple way to do this ?

Thanks in advance.