Linux Raspbian update issue

LaatSahab

Skilled
Trying to update my Raspbian for the last couple of days but always keep getting this error. Checked the Pihole query log too, to see if it is blocking the connection but that wasn't the case either. What seems to be the problem here?

up-err.jpg
 
As the domain name has been resolved to ip your dns is fine. Are you able to ping the server? See if you have any blocklist(firewall based) that might be doing something.
 
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