RFC_PING — RFC_PING Function Module for Connectivity Testing

RFC_PING is a remote-enabled function module with no executable logic of its own. Calling it across a destination forces the full RFC round trip to happen: DNS or host resolution, gateway registration, network transport, logon to the target client with the destination's stored or passed credentials, dispatch to a free work process, and return of control. Because it does nothing on the target side beyond that round trip, a successful call is a clean signal that the plumbing works, with no interference from application logic, locks, or authorization checks on business objects. It is released for customer use and is the function module invoked internally when the connection test button is pressed in the RFC destination maintenance transaction. It is not intended to carry any payload or be extended.

RFC_PING has no import parameters, no export parameters, no tables parameters, and no changing parameters. Its interface is empty by design. Anything a caller wants to check about the state of the round trip has to come from the standard RFC exceptions raised by the CALL FUNCTION statement itself, not from any data returned by the module, because none is returned.

RFC_PING's own interface defines no exceptions because it has no application logic to fail. What consultants call 'RFC_PING exceptions' are actually the generic system exceptions the runtime appends to any CALL FUNCTION DESTINATION statement. COMMUNICATION_FAILURE means the caller could not even reach the target: wrong host or gateway entry in the destination, network blocked, or the gateway process down. SYSTEM_FAILURE means the network path worked but something failed once inside the target system, most often a logon failure, a locked or password-expired RFC user, or a short dump on the target. RESOURCE_FAILURE means the target was reached and logon succeeded but no dialog or RFC work process was free to service the call. Catching all three into a bare OTHERS branch without capturing sy-subrc and the associated message text discards exactly the detail needed to tell a network problem apart from a locked user apart from a saturated work process pool, and leads to wasted time chasing the wrong layer.

Call it as CALL FUNCTION 'RFC_PING' DESTINATION <dest> and always list the three standard exceptions explicitly with MESSAGE clauses rather than relying on a bare OTHERS, so the returned message text is available for logging. After the call, check sy-subrc regardless of whether an exception fired, since a subrc of zero with no exception is the only condition that actually confirms success. For a manual first check, run the connection test from the RFC destination maintenance transaction before writing or debugging a program that calls it, since that isolates whether the problem is the destination itself or the calling code around it.

RFC_PING is unchanged in S/4HANA. It remains a basis-level infrastructure module, not custom code, and is not affected by clean core restrictions since it ships as standard and is released for use as-is. There is no successor function module; it continues to be the module invoked by the standard connection test facility for RFC destinations and remains the practical tool for isolating connectivity problems from application-level ones.

Most incidents involving RFC_PING come from treating a successful ping as proof the actual interface will work, or from swallowing the exception text and losing the real cause.

Basis owns the RFC destination configuration, the gateway, and the work process pool that RFC_PING exercises. Interface and integration developers own the calling code and are responsible for handling its exceptions correctly and logging the message text rather than assuming basis will always see the same failure the application saw.

Connects to RFC destination maintenance and the underlying destination table, to gateway monitoring for connection and registration issues, and to work process monitoring when RESOURCE_FAILURE points at pool exhaustion rather than a network problem. Short dumps produced on the target side during a failed ping are visible through the standard dump analysis transaction and are the fastest way to confirm a SYSTEM_FAILURE was caused by a runtime error rather than a plain logon rejection.