W: Failed to fetch http://security.debian.org/dists/jessie/updates/main/binary-amd64/Packages Hash Sum mismatch

Hi guys,

I am getting this issue:

W: Failed to fetch
http://security.debian.org/dists/jessie/updates/main/binary-amd64/Packages
 Hash Sum mismatch

>From Singapore (on a couple of hosts). But not from a VPS in the UK. 

Starting to think there is some CDN mis-configuration? Please let me
know how I can help.

 dig security.debian.org

; <<>> DiG 9.10.4-P2 <<>> security.debian.org
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 48312
;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 0

;; QUESTION SECTION:
;security.debian.org.           IN      A

;; ANSWER SECTION:
security.debian.org.    300     IN      A       133.242.99.74

;; Query time: 195 msec
;; SERVER: 132.147.113.3#53(132.147.113.3)
;; WHEN: Mon Aug 01 17:13:13 SGT 2016
;; MSG SIZE  rcvd: 53


Cheers,