Problems have been experienced whereby MFA hangs when drag-and-drop or Record Level IO (RLIO) operations are attempted to the host system using Extra! Personal Client. In these circumstances MFA must be terminated and restarted. This issue has been raised with Attachmate and the cause of the problem has been diagnosed. Watch this space for news on the availability of a patch from Attachmate for this problem.
If CCIAPPC is used over a LAN (802.2) connection which uses routers to reach the host system intermittent connection failures may be experienced. If packet sizes of the APPC traffic are larger than the maximum packet size allowed by the router then the larger APPC packets will be discarded resulting in a connection failure. This could also cause problems in activating a connection with the host system.
The solution to this problem is to reduce the Basic Transmission Unit (BTU) size of the APPC traffic so that it is less than or equal to the maximum packet size allowed by the router. This is achieved by reducing the BTU parameter on the Link definition using the APPN Configurator.
You should check with the Network Administrator to determine the maximum packet size allowed by the router. If in doubt, we suggest that the BTU be reduced to 521 bytes which is usually well below the limit imposed by the router.