Error: Error GnuTLS -18: An error was encountered at the TLS Finished packet calculation.

[Adun]

This error started to occur when connecting to the Filezilla FTP server via the Filezilla client. Help me understand what the reason might be.

Status: Connecting*******
Status: Connection established, waiting for welcome message...
Command: AUTH TLS
Response: 234 Using authentication type TLS
Status: Initializing TLS...
Status: Verifying certificate...
Status: TLS connection established.
Command: USER *****
Response: 331 Password required for ******
Command: PASS **********
Response: 230 Logged on
Command: SYST
Response: 215 UNIX emulated by FileZilla
Command: FEAT
Response: 211-Features:
Response: MDTM
Response: REST STREAM
Response: SIZE
Response: MLST type*;size*;modify*;
Response: MLSD
Response: AUTH SSL
Response: AUTH TLS
Response: PROT
Response: PBSZ
Response: UTF8
Response: CLNT
Response: MFMT
Response: EPSV
Response: EPRT
Response: 211 End
Command: PBSZ 0
Response: 200 PBSZ=0
Command: PROT P
Response: 200 Protection level set to P
Status: Authorized
Status: Retrieving directory listing...
Command: PWD
Response: 257 "/" is current directory.
Command: TYPE I
Response: 200 Type set to I
Command: PASV
Response: 227 Entering Passive Mode (10,128,35,32,195,89)
Command: MLSD
Response: 150 Opening data channel for directory listing of "/"
Error: Error GnuTLS -18: An error was encountered at the TLS Finished packet calculation.
Error: Could not read from socket: ECONNABORTED - Connection aborted
Response: 426 Connection closed; aborted transfer of "/"
Error: Failed to retrieve directory listing

[Adun]

connecting to FileZilla Server 0.9.60 beta on Windows server 2012 r2

Use Filezilla client
----------------
Version: 3.49.1

Build information:
Compiled for: x86_64-w64-mingw32
Compiled on: x86_64-pc-linux-gnu
Build date: 2020-07-15
Compiled with: x86_64-w64-mingw32-gcc (GCC) 8.3-win32 20190406
Compiler flags: -g -O2 -Wall

Linked against:
wxWidgets: 3.0.6
SQLite: 3.31.1
GnuTLS: 3.6.14

Operating system:
Name: Windows 10 (build 17763), 64-bit edition
Version: 10.0
Platform: 64-bit system
CPU features: sse sse2 sse3 ssse3 sse4.1 sse4.2 lm
Settings dir: C:\Users\Adun\AppData\Roaming\FileZilla\

[botg]

Are you any firewalls? What happens if you completely disable, or better yet uninstall them for a test?

[Adun]

Only Windows firewall. Disabling it, the problem persists, and adding exception rules (access to everything) didn't help either.

[botg]

Do you still experience it in 3.50.0?

[Adun]

yes

[Adun]

There are still some ideas, the problem has not been solved. Tell me at least in which direction to look

[botg]

Try installing a more modern CPU in the computer running the client.

[Adun]

checked on a PC with i5 7400t and 16 gb, same error occurs.

[Adun]

Thank you very much for your advice. The problem turned out to be on the provider's firewall hardware. The application filter on port 21 was incorrectly configured.