Connection reset by peer (SFTP)

[mil4]

Hi,

I am running FileZilla on a new MacBook Air (M1 chip). It was working in the beginning of February, but today when I wanted to use it, it keeps giving me this message:
Status: Connecting to 157.139.xxx.xx...
Response: fzSftp started, protocol_version=10
Command: open "research@157.139.xxx.xx" 22
Error: FATAL ERROR: Connection reset by peer
Error: Could not connect to server
Status: Waiting to retry...
Status: Connecting to 157.139.xxx.xx...
Response: fzSftp started, protocol_version=10
Command: open "research@157.139.xxx.xx" 22
Error: FATAL ERROR: Connection reset by peer
Error: Could not connect to server

I had a colleague try using it from his older Mac and it works perfectly, with the exact same information used.

Why is this suddenly happening and what can I do?
I am not using any firewall..

[botg]

Which version of FileZilla are you using?

Do you have a large number of keys loaded in your system's SSH agent?

[mil4]

Hi,

Im running:
FileZilla Client
----------------

Version: 3.52.2

Build information:
Compiled for: x86_64-apple-darwin20.2.0
Compiled on: x86_64-apple-darwin20.2.0
Build date: 2021-01-18
Compiled with: Apple clang version 12.0.0 (clang-1200.0.32.28)
Compiler flags: -O2 -g -Wall -Wextra -pedantic -O2 -g -Wall -Wextra -pedantic -Werror=partial-availability

Linked against:
wxWidgets: 3.0.6
SQLite: 3.31.1
GnuTLS: 3.6.15

Operating system:
Name: Mac OS X (Darwin 20.3.0 x86_64)
Version: 11.2
CPU features: sse sse2 sse3 ssse3 sse4.1 sse4.2 aes pclmulqdq lm
Settings dir: /Users/x/.config/filezilla/

About the keys, I don't think so.
Nothing changed in the past year I have been using Filezilla. except my laptop. But since it worked on this laptop in the beginning, I don't understand why it stopped.