China GWF block ocsp server ip

It seems that there is some kind of filtering in place here.
My analysis shows:

nmap m.xiaoyu.net
Starting Nmap 7.92 ( https://nmap.org ) at 2022-11-15 21:18 PST
Nmap scan report for m.xiaoyu.net (185.10.17.74)
Host is up (0.36s latency).
Other addresses for m.xiaoyu.net (not scanned): 2602:fed2:7021::3
rDNS record for 185.10.17.74: mx.xiaoyu.net
Not shown: 994 filtered tcp ports (no-response)
PORT    STATE SERVICE
25/tcp  open  smtp
53/tcp  open  domain
80/tcp  open  http
443/tcp open  https
465/tcp open  smtps
993/tcp open  imaps


There must be something else in play here:

Hopefully another expert here can help.

4 Likes