Connectivity issue in AMS

In the last day or two we started receiving reports of issues from some european customers. I narrowed down the problem via fly ssh console -s where I noticed AMS cannot reach our upstream DNS nameservers.

AMS:

/ # dig u.channelsdvr.net @162.159.24.4

; <<>> DiG 9.16.29 <<>> u.channelsdvr.net @162.159.24.4
;; global options: +cmd
;; connection timed out; no servers could be reached

CDG:

/ # dig u.channelsdvr.net @162.159.24.4

; <<>> DiG 9.16.29 <<>> u.channelsdvr.net @162.159.24.4
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 25265
;; flags: qr aa rd; QUERY: 1, ANSWER: 0, AUTHORITY: 1, ADDITIONAL: 1
;; WARNING: recursion requested but not available

;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 1232   
;; QUESTION SECTION:
;u.channelsdvr.net.             IN      A

;; AUTHORITY SECTION:
u.channelsdvr.net.      300     IN      SOA     ns1.dnsimple.com. admin.dnsimple.com. 1580080942 86400 7200 604800 300

;; Query time: 4 msec
;; SERVER: 162.159.24.4#53(162.159.24.4)
;; WHEN: Sat Aug 06 17:09:55 UTC 2022
;; MSG SIZE  rcvd: 104

Appears to be working again from AMS