SFTP connection reset
Why SSH/SFTP sessions reset unexpectedly and how to diagnose network or server issues.
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Test whether the network port is reachable before investigating authentication problems.
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Connection reset errors occur when the SSH server terminates the connection unexpectedly.
Common causes
- SSH service restarted
- Firewall interrupting connection
- Protocol mismatch
Fix checklist
- Check SSH server logs.
- Verify firewall rules.
- Retry connection using verbose SSH output.
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Related
- ECONNREFUSED on port 22 — Meaning of ECONNREFUSED for SFTP/SSH on port 22 and the fastest ways to isolate firewall vs service vs wrong port.
- SFTP connection refused — What “connection refused” means for SFTP and how to fix port/service/firewall issues quickly.
- SFTP connection timeout — Why SFTP connections timeout and how to troubleshoot firewall or network issues.
- SFTP port 22 blocked — Why port 22 blocks SFTP access and how to fix firewall or security group rules.
- TCP connection timeout (firewall issue) — Why FTP/SFTP connections time out and how to diagnose firewall, routing, or allowlist blocking.
- TCP connection failed — General TCP failure causes when connecting to FTP, FTPS, or SFTP services.
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