I am new here so starting: Hello Everybody!
I am looking for a help with one website.
We are using proxy server which has setup 220.127.116.11 as a DNS server.
When trying to access https://nationalbank.kz unfortunately from time to time we get 504 error DNS lookup failed while it works without proxy.
The weired thing is that when the issue occurs the nslookup (with 18.104.22.168) works properly and the name can be resolved however using for example dnschecker.org the name can’t be resolved (for 22.214.171.124) but for other resolvers (for example 126.96.36.199) it can.
Can you please point me what can be the problem behind this?
Thank you in advance.