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it can be because of serveral reasons
1) a firewall that is blocking , on server or on client (most common)
and can be fixed by disabling it or adding his ip (firewall includes but is not limited to computer , router , programs ... )
this get used mostly by websites to that like to BAN some persones , they just add your ip to his firewall and problem solved
2) least common , the datacenter that blocked a ip range because DDOS atks on the datacenter (o yes that happends .. ) but then you wont be able to send a ping to him and he wont be able to conect to you whatever you do (contact datacenter)
3) ISP , same as the datacenter , but then your ips that blocked the conection
the ISP got mainly a good reason to block certain ip's or country's and only thing to solve it is to contact your isp about it (like i have with certain sites )
for the rest there are no other options
Greets From PowerChaos
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