Supply planning EDI integration delayed due to FTP timeout errors during large file transfers from supplier system

ERP SAP S/4HANA
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1

We’re experiencing FTP timeout issues with our EDI integration for supply planning in SAP S/4HANA 2020. Large EDI files (over 50MB) consistently timeout during transfer from our supplier’s FTP server, causing delayed material availability updates. The timeout occurs around the 180-second mark regardless of file size above this threshold.

Interestingly, smaller files (under 20MB) transfer perfectly fine with no issues. We’ve already tried increasing the FTP timeout parameter in our integration configuration from 180 to 600 seconds, but the problem persists. The network team confirmed bandwidth isn’t the bottleneck.

This is impacting our supply chain visibility as we’re missing critical planning data. Has anyone dealt with similar FTP timeout behavior where only large files fail?

2

I’ve seen this before. FTP timeouts on large files often indicate a connection stability issue rather than a simple timeout setting. Check if your firewall or NAT gateway has connection tracking timeouts that are lower than your FTP timeout. Many enterprise firewalls drop idle connections after 300 seconds by default, which would explain why increasing your application timeout didn’t help.

3

Consider switching to SFTP instead of standard FTP. SFTP handles large files more gracefully and provides better error recovery. We migrated our supply planning EDI integration from FTP to SFTP last year specifically because of timeout issues with large forecast files. The implementation took about two weeks including supplier coordination, but we haven’t had a single timeout since. SFTP also gives you better security and transfer resumption capabilities if connections drop mid-transfer.

4

I experienced this exact issue with large EDI files timing out while small files worked fine. The root cause was a combination of factors, and here’s what actually resolved it.

First, regarding the FTP timeout on large files - the 180-second threshold you’re hitting suggests a network infrastructure timeout rather than an FTP protocol issue. Check your firewall’s connection tracking timeout and NAT gateway settings. We discovered our corporate firewall was terminating idle connections after 240 seconds, but the FTP control channel was staying alive while the data channel appeared idle during large transfers.

For the small files transferring fine, this confirms your FTP configuration and credentials are correct - the issue is specifically related to transfer duration. Implement FTP keep-alive packets on the control channel to prevent the firewall from considering the connection idle. Configure this in your SAP integration layer:


ftp.keepalive.enabled=true
ftp.keepalive.interval=60
ftp.control.keepalive=true

Regarding the timeout increase you tried - increasing the application timeout won’t help if an intermediate network device is dropping the connection. You need to address the network layer. Work with your network team to either increase firewall connection tracking timeouts to match your transfer duration or implement TCP keep-alive at the OS level.

Additionally, consider implementing a hybrid approach: configure your EDI integration to automatically split files larger than 40MB into multiple segments before transmission. This keeps individual transfers under your timeout threshold while maintaining data integrity. On the receiving end, implement an automatic file assembly process that concatenates the segments based on sequence numbers in the filename.

For immediate relief, enable FTP passive mode if you haven’t already, and configure your integration to use binary transfer mode explicitly. We also implemented retry logic with exponential backoff - if a large file fails, the system automatically retries up to three times with increasing delays.

Monitor your integration logs for specific FTP error codes. A 421 timeout code indicates server-side issues, while connection reset errors point to network infrastructure problems. This will help you pinpoint whether the supplier’s FTP server or your network path is the bottleneck.

After implementing these changes, our supply planning EDI integration handles files up to 200MB without any timeout issues, and we’ve had zero delays in material availability updates for the past six months.