poseidonhd.co
Mixed
Results vary across poseidonhd.co: of 2 URLs tested, 1 is blocked and 1 is disrupted some of the time. The Great Firewall resets the connection. 2 tests have been run under this domain since 2026-08-13, the most recent on 2026-08-13.
The two are filtered by different means — an unencrypted request by the address and keywords it carries in the clear, an encrypted one by the server name in its TLS handshake — so one working while the other does not is normal.
The site itself
http://poseidonhd.coBlockedhttps://poseidonhd.coIntermittentAbout poseidonhd.co and the Great Firewall
Results vary across poseidonhd.co: of 2 URLs tested, 1 is blocked and 1 is disrupted some of the time. The Great Firewall resets the connection. 2 tests have been run under this domain since 2026-08-13, the most recent on 2026-08-13.
Plain HTTP and HTTPS differ here: http://poseidonhd.co is blocked, https://poseidonhd.co is intermittent. The two are filtered by different means — an unencrypted request by the address and keywords it carries in the clear, an encrypted one by the server name in its TLS handshake — so one working while the other does not is normal.
A VPN or another circumvention tool routes the request outside mainland China, past the filtering that blocks poseidonhd.co. GreatFire runs GreatFire VPN; the Analyzer also tests the domains of many VPN and proxy providers, so you can check whether one is reachable before relying on it.
Elsewhere on the site
Most-blocked .co domainsEvery tested URL under poseidonhd.co
Each URL's status is its verdict over the last 90 days, the same one its own page headlines.