IPv6 Connectivity Issue

[mauropc]

I hope this message finds you well.
I am writing to report a connectivity issue with my IPv6 host, specifically the address 2001:470:d:xxx::y. It appears that there is a block on incoming connections to this host (only this host), others works fine, which is affecting my ability to use the services associated with it.

The host use web/mail server. ports 80,443, 110, 143, 20 and 21.