Description

RFC Communication error from the Gateway server on trying to connect to SAP via Studio or Transaction:

Message type: Connect from SAP gateway to RFC server failed
Connect_PM GWHOST=*IP address*, GWSERV=sapgw**, ASHOST=*IP address*  SYSNR=**
LOCATION SAP-Gateway on host *server name*/ sapgw**
ERROR timeout during allocate
TIME
RELEASE
COMPONENT SAP-Gateway
VERSION
RC 242
MODULE
LINE
DETAIL no connect of TP sapdp** from host *IP address* after ** sec
COUNTER 2

or Error Message: RFC_ERROR_COMMUNICATION - ERROR 10054

Applies to

Studio, Transaction
10.x, 11.x

Cause

If there is a firewall between the client and gateway that converts external IP addresses into internal addresses, the gateway receives an invalid external IP address and, as a result, cannot establish a connection to the actual target.

Solution

1. The gateway host and the actual target are usually identical. In this case, you can use parameter gw/alternative_hostnames to indicate to the gateway that the external IP address received identifies the host.
   **Caution: gw/alternative_hostnames may only be set in the instance profile and under no circumstances in the DEFAULT.PFL!!!

2. Check all the required ports are open as per Default ports used by Winshuttle software
3. Check with the SAP Basis team regarding the Connection type used in System Entry Properties for the SAP server being connected to. Group-server option is used for SAP logon groups for load balancing so may resolve time-out issues that are caused by restrictions on the SAP router, firewall settings or by a network issue.

Additional Information

See SAP OSS note 148832