Troubleshooting Comm_tbl Sap-gateway Table Errors

Some users recently reported that they encountered sap gateway comm_tbl table error.

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Due to the restructuring of the DMZ in our network, the IP address of each R3 server will change from 172.20.x.x to 192.168.x.x. and the original is IP-NAT for connections. We have access to SAPGUI, but RFCs from this server to other systems do not work. We found that due to the same problem, we are unable to remotely send RFCs from other servers and cleaners to this R3 system.

DETAILED ERROR: No connection from TP sapdp00 due to host after 20 seconds

As shown in the map, note 148832 – IP address translation and firewall, we added the BW system entry to gw / alternate_hostnames but it never works.

This issue is due to the fact that we cannot access this R3 server from BW

Target check result. Error opening target RSAR 375 connection

• ERROR => GwRqDpSendTo: comm_adm entry not found (gw = and sapdp00, rq = 203, idx = 12, conv = 27032592, uid = 1143, mode = 0 [gwdp

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• LOCATION of the SAP gateway on host / sapgw01

• ERROR COMM_TBL table error

• 

  TIME Thursday, December 3, main time 10:59:47 am 2009

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