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How to Troubleshoot SFTP File Transfer Failures

  • Updated

SFTP file transfer secures your critical data exchanges, but connection or permission failures can sometimes block your workflows. In this guide, discover how to identify, diagnose, and quickly resolve SFTP transfer and call transfer anomalies.

 

1. Identifying SFTP transfer errors 

The first step is to precisely locate the source of the malfunction. 

  1. Open your terminal or SFTP client. 
  2. Access the SFTP server log files. 

  3. Look for critical error messages (e.g. "Cannot write to remote file" or "Transfer failed"). 

     

2. Diagnosing and resolving the SFTP issue 

Once the anomaly has been detected, follow these actions to restore the service: 

  1. Check your connection details (host, port 22, and credentials). 
  2. Check your write permissions on the target directory.
  3. Test for the absence of network restrictions or blocking firewalls. 
  4. Contact the recipient's technical support if the failure persists. 
Common causes of SFTP failures 
  • Insufficient access permissions. 
  • Network instability or disconnection. 
  • Incorrect file paths or target directories. 
  • Exceeding storage space limits on the server. 
  • General misconfiguration of the SFTP server. 
💡 Tip: Using public/private SSH keys instead of simple passwords improves reliability and prevents connection failures. 

 

3. Resolving call transfer issues 

In technical telephony environments, routing difficulties can also arise.

  1. Check the stability of your overall network connection. 
  2. Check your call transfer permissions in the system settings. 
  3. Update your telephony software to the latest version.
Advanced call transfer diagnostics 
  • Check the forwarding configuration for each phone number. 
  • Test transfers on multiple systems to check if the issue is widespread. 
  • Analyse recent system updates to detect any configuration conflicts.
 ⚠️ Important : If the issue persists after these checks, contact technical support providing the error details or the relevant call ID. 

 

4. Understanding the role of .ko files 

When an automated file transfer fails, the system generates specific files. [5]

  • Definition : .ko files (meaning "knockout" or "failure") serve as system error markers. 
  • Role : They indicate precisely which file failed and alert you to the need for manual intervention or retransmission. 

 

🎉 You now know how to resolve SFTP transfer and call transfer failures to ensure smooth and secure communications!