I was upgraded to fibre yesterday and i couldn't connect to my work citrix server. On checking the router setting I found that the DNS servers and been changed to 79.79.79.79 & 79.79.79.80. When I changed the primary server to Googles DNS 8.8.8.8, I could connect to my work citrix. Looks like Talktalk's DNS server has a problem resolving the citrix url.
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