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Hi,
This can come from a problem with IPv6 on the server.
Check you do not have an IPv6 in your maintenance ip exclusion list (Configure > Shop parameters > General > Maintenance > Maintenance IP)
An IPv4 is 4 numbers separated by a dot like : 78.193.135.55
An IPv6 is a hexadecimal string with numbers and letters separated by a colon like : 2001:41d0:2:2c88::
IPv6 is the "new" internet protocol but there are still some old servers not fully compatibles with it.
If you have the Nt Backup And Restore module installed :
The Nt Backup And Restore module has an option to automatically start a backup daily just by enabling it (still a standard cron is available).
Like a webcron, this is the 2N server which remotely start the backup.
To make it run even in maintenance mode, the module add the 2N server IP (v4 and v6) in the maintenance exclusion list.
You can manage it in the Automation menu of the module > Advanced > Automation by 2n-tech.com IP authorization
Choose "Authorize only IPv4" (or "Authorize neither IPv4 nor IPv6" to disable it completely).
Best regards,
Damien
2N Technologies