api.ww.wp.xz.cn unreachable !

1 critical issue

Could not reach ww.wp.xz.cn
Security
Communicating with the WordPress servers is used to check for new versions, and to both install and update WordPress core, themes or plugins.

Error Your site is unable to reach ww.wp.xz.cn at api.ww.wp.xz.cn, and returned the error: cURL error 6: Could not resolve host: api.ww.wp.xz.cn; Unknown error

VPS, Tampa (FL)

But I can’t resolve the hostname from my home PC either (and it is in Europe)

but still not working from my VPS:

[root@vpanel ~]# nslookup api.ww.wp.xz.cn
;; Got SERVFAIL reply from 127.0.0.1, trying next server
Server:		::1
Address:	::1#53

** server can't find api.ww.wp.xz.cn: SERVFAIL

[root@vpanel ~]# host api.ww.wp.xz.cn
Host api.ww.wp.xz.cn not found: 2(SERVFAIL)
[root@vpanel ~]#

I will try to restart BIND and will check again.

After adding nameservers 8.8.8.8 and 8.8.4.4 to /etc/resolv.conf now it is working again.
The strange part is, that I didn’t have this issue before and didn’t make any changes to the VPS, it was not even rebooted for days/weeks.