FTP_CONNECT failed for SAPFTP from WD4A to external Server

Question

Hi experts,
this is a challange to you.
He do have a WD4A application runnig on a BI with  SAP NetWeaver 2004s and a SAP BASIS 700 Level 21 highest Support package SAPKB70021.
The application runs well and only some strange behaviors in CZ and HU we have obtained. But this is not the Question i will ask:
For an excel template download we will use at an external MS Server2003. We want to sent the data string which has to
be displayed in excel via FTP to this server (The server will convert the data string with makros and send it back zu WD4A).
So far so good. But every time we tried to open the connection with FTP_CONNECT we the communication failed.
What do we do exactly?
1. Event through Button
1. Creating the data string on Eventhandler method (View)
2. using a Function Call from Eventhandler to start the file transfer.
3. Parameters are user, pwd, host, destination ...
4. with HTML_SCAMBLE hint pwd
5. call function 'FTP_CONNECT'
The connection failed.
WE DO CALL the Function correct, cause testing FTP_CONNECT with Program RSFTP002 the connection works.
IF we start the Function Call we use inside the WD4A outside the WD4A, the connection works.
We do have an ITS Service which works on this Server. An RFC CALL to the ERP R/3 with the same Function Call fails also as the Call in BI.
Does anyone know, if  there are technical limits to WD4A to use the connections to an external server via SAPFTP ? It is forbidden to mount the file system of the server directly on the SAP BI System.
Our Basis and Network guys would not find anything.
At least: WE do use an Excel download with templates without using the MS Server. Therefore we have problems with different MS Office Versions, Language and date display. Thats why we want to go the way above.
lot of greetings
Thorsten

Answer 1

Hi,
where exactly is the FM crashing and why? Did you debug? Is it occuring at
CALL FUNCTION 'FTP_CONNECT' DESTINATION RFC_DESTINATION
     EXPORTING USER = USER PWD = PASSWORD ACCT = ACCOUNT HOST = HOST
               TRACE = FTP_TRACE GUSER = GATEWAY_USER
               GPWD = GATEWAY_PASSWORD GHOST = GATEWAY_HOST
     IMPORTING HANDLE = HANDLE ERROR = CERROR
     EXCEPTIONS SYSTEM_FAILURE = 1 COMMUNICATION_FAILURE = 2.
or earlier?
Try tracing with ST01, one time with the way it works, and another time out of the WebDynpro where it crashes, then compare the logs.
regards, Lukas