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SFTP connection failing with FILEZILLA And WINSCP Clients after upgrading SBC's to 8.4 release. (Doc ID 2727089.1)

Last updated on FEBRUARY 23, 2021

Applies to:

Integrated Software for Acme Packet 4600 - Version S-Cz8.4.0 and later
Information in this document applies to any platform.

Symptoms

SBC rejecting the SFTP connection from FILEZILLA and WINSCP Clients after upgrading to 8.4 release.

Status: Connecting to 10.X.X.X
Response: fzSftp started
Command: open "admin@10.X.X.X" 22
Error: Network error: Software caused connection abort
Error: Could not connect to server
Status: Waiting to retry...
Status: Delaying connection for 1 second due to previously failed connection attempt...
Status: Connecting to 10.X.X.X...
Response: fzSftp started
Command: open "admin@10.X.X.X" 22
Error: Network error: Software caused connection abort
Error: Could not connect to server

 

Using filezilla, it received the following error:


Error: Server unexpectedly closed network connection
Error: Could not connect to server
Status: Waiting to retry...
Status: Connecting to 10.X.X.X...
Response: fzSftp started, protocol_version=8
Command: open "admin@10.X.X.X" 22
Error: Server unexpectedly closed network connection
Error: Could not connect to server

 

In some cases you can find below error messages in logs"

[GENERAL] (0) sshd[5430]: fatal: No supported key exchange algorithms found

Changes

In 8.3 release we had insecure key-exchange and hmac algorithms set as default.

SBC 8.4 release supports below algorithms by default.

hmac-algorithms hmac-sha2-256
keyex-algorithms diffie-hellman-group-exchange-sha256

Cause

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In this Document
Symptoms
Changes
Cause
Solution


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