Symptom
***** Consulting KBA, not a proposal from SAP development nor SAP product support *****
- Standard TCP/IP RFC destinations SAPFTP/SAPFTPA are called via ABAP to initiate an FTP transfer.
- Active mode FTP connection used.
- Error Accept on data channel failed : NIETIMEOUT timeout 720000 ms occurs.
- Passive mode transfer functions properly.
- tcpdump/wireshark packet trace shows PORT command attempting to reuse the same port within a short timeperiod (less than 60 seconds).
- Operating system kernel parameter net.ipv4.tcp_tw_reuse is set to 0 or 2.
- The file /proc/sys/net/ipv4/ip_local_reserved_ports contains high number of ports and port ranges.
- Parameter reserved_port/enable is not set at all or set to true in the SAP Host Agent's profile.
dev_ftp contains similar error message
Thr 140736265546080] [289581] > PORT 1xx,xx,x,xx,35,43 |
Wireshark packet trace
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Environment
- SuSE Linux Enterprise Server 15 (x86_64 and ppcle)
- SAP S/4HANA 2021
- SAP Host Agent 7.22
Product
Keywords
reserved_port/enable, /proc/sys/net/ipv4/ip_local_reserved_ports, net.ipv4.tcp_tw_reuse, SAPFTP, active mode connection , KBA , BC-SRV-COM-FTP , File Transfer via FTP , BC-CCM-HAG , Host Agent , Problem
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