GTS online NE-21000409 error code!

[admax]

Hello dears,
since last week till now I am not able to connect to GTS online.
local save, sport mode and other stuff is not working with mentioned error.
iv tried another internet link, different ISP, static DNS and different DNS server, but still same error.
I am living in Tehran, are we banned? how can I find correct meaning of error codes?
please help me, I really like GTS . Im playing with PS4.

thank you in advance
best regards
admax.