Plesk provides error in Tools & Settings > IP Addresses Banning (Fail2Ban) > Ban

[senthil]

Symptoms

• Error like below appears during an attempt to access Tools & Settings > IP Address Banning (Fail2Ban) > Banned
  IP Addresses menu:
  f2bmng failed: Traceback (most recent call last): File "/usr/bin/fail2ban-client", line 34, in
  <module> from fail2ban.client.fail2banclient import exec_command_line, sys
  ModuleNotFoundError: No module named 'fail2ban' ERROR:__main__:Command
  '['/usr/bin/fail2ban-client', '--str2sec', '1w']' returned non-zero exit status 1.
  ERROR:__main__:Not a time string: 1w
  
• Server uses Python 3.9 (or some other version):
  
  Code Select Expand
  #/usr/bin/python3 -V
Python 3.9.0

Cause
Fail2Ban component requires Python 3.6 version, but the server invokes another Python version. Such behavior is
considered as a bug with ID PPPM-14555.

Resolution
Workaround: modify the Fail2Ban files, so it would use Python 3.6

• Log into server via SSH.
• Modify the first line of the /usr/bin/fail2ban-client file using one of the following methods:

• Open file using vi (or some other editor), and specify Python 3.6 on the first line:
  
  Code Select Expand
  #!/usr/bin/python3.6

Or

• Run the following command to modify the file:
  
  Code Select Expand
  #sed -i '1s|^#!/usr/bin/python3|#!/usr/libexec/platform-python3.6|'
/usr/bin/fail2ban-client