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MS Visual Studio .Net 2003 and SAP .Net Connector failure

Hi Gurus,

My environment is "SAP Client <-> firewall <-> SAP Server"

First scenario, SAP Client is SAPGui 6.20,

Cisco PIX Firewall,

SAP Server is SAP R/3 4.6C

Result -> I can connected via SAPGui to 3204/tcp successfully.

Second scenario, SAP Client is SAP .Net Connector & MS Visual Studio .Net 2003,

Cisco PIX Firewall,

SAP Server is SAP R/3 4.6C

Result -> I cannot connect via SAP .Net Connector to 3304/tcp as error below.

What's my mistake? Please recommend too.

Connect from SAP gateway to RFC server failed

Connect_PM GWHOST=, GWSERV=sapgw04, ASHOST=, SYSNR=04

LOCATION SAP-Gateway on host prdsapr3

ERROR connection to host, service sapgw04 timed out

TIME Thu Mar 10 16:17:12 2005


COMPONENT NI (network interface)


RC -12

MODULE nixxi.c

LINE 749




Choosak B.

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1 Answer

  • Posted on Mar 10, 2005 at 09:51 AM

    RFC (and thus NCo) needs RFC port 3304 to be open. Likely this is blocked by the firewall. You can easily check with "telnet 3304".

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    • Former Member Former Member

      We have exactly the same problem.

      But according to our systemmanager, he is unable to set

      the parameter gw/alternative_hostnames as it is not accepted.

      Can this parameter be used in conjunction with netstat?

      I know it would solve our problem because we were able to fix the problem by assigning an IP-alias with the external IP-address. but this was causing to much other problems.

      Could you give me more detailed information on how to set this parameter?

      Thank you in advance,


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