External provider can’t access to my website. They told me :
“We still do not have access; Please check if your server has blocked our IP or is blocking external IPs. You can also add us as partners on your server so that we can access it.”
You must have given them the wrong credentials to access whatever service they need to access, beware that some windows parteners dont understand how linux works or just try to connect through windows software that won’t work out of the box. Work out where file2ban banned them and add them to that jails white list through the webmin fail2ban module and making sure you restart fail2ban after making changes