Can you download the state file manually, e.g. with wget -O - https://planet.openstreetmap.org/replication/hour/state.txt?

@lonvia: Yes. i can download via wget. But in php got above error. Also tried in separate php file as follows(but met same err).

stream_context_set_default(['http'=>['proxy'=>'proxy:3128', 'header'=>'Proxy-Authorization: Basic '.base64_encode('user:password')]]); echo file_get_contents("https://planet.openstreetmap.org/replication/hour/state.txt");

I can get state.txt from https://ftp5.gwdg.de/pub/misc/openstreetmap/planet.openstreetmap.org/replication/day/state.txt . Can I use the same for update?

Just to be 100% sure - your PHP is definitely downloading via https not http ?

@SomeoneElse Yes, My PHP downloading via https. Also got 400 response code for https://free.nchc.org.tw

my php file:

stream_context_set_default(['http'=>['proxy'=>'proxy:3128', 'header'=>'Proxy-Authorization: Basic '.base64_encode('user:pwdl')]]); echo file_get_contents("https://download.geofabrik.de/europe/andorra-updates/state.txt"); echo file_get_contents("https://planet.openstreetmap.org/replication/day/state.txt"); echo file_get_contents("https://free.nchc.org.tw/osm.planet/replication/day/state.txt"); echo file_get_contents("https://ftp5.gwdg.de/pub/misc/openstreetmap/planet.openstreetmap.org/replication/day/state.txt");

Response:

original OSM minutely replication sequence number 3121624

timestamp=2018-08-27T20\:14\:02Z sequenceNumber=1987

Warning: file_get_contents(https://planet.openstreetmap.org/replication/day/state.txt): failed to open stream: HTTP request failed! HTTP/1.1 421 Misdirected Request

Warning: file_get_contents(https://free.nchc.org.tw/osm.planet/replication/day/state.txt): failed to open stream: HTTP request failed! HTTP/1.1 400 Bad Request

Tue Aug 28 00:06:42 UTC 2018

sequenceNumber=2176 timestamp=2018-08-28T00\:00\:00Z

This looks like an issue with your proxy, likely a misconfiguration of HTTPS forwarding or SSL. I recommend that you get in touch with your system administrator to find out more.