SFTP connection failing with FILEZILLA And WINSCP Clients after upgrading SBC's to 8.4 release.
(Doc ID 2727089.1)
Last updated on FEBRUARY 07, 2024
Applies to:
Integrated Software for Acme Packet 4600 - Version S-Cz8.4.0 and laterInformation 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 |