My laptop shows limited connectivity with 9.9.9.11 on port 853 after some time usage with these settings. if i am using 8.8.8.8 then internet resumes but limited connectivity error remains. seems ISP blocked 9.9.9.11 DNS server of quad9.net. How 8.8.8.8 resumes internet? It does not support 853 only 53.
Any suggestions?. I have enabled only 443 tcp and 853 tcp ports. rest all blocked in my laptop outgoing connections.including 53 udp and tcp
Just enabled ipv6 and mentioned domain name tls://dns11.quad9.net . Then connection established. what could be the reason?. on PV4 have they blocked 853 or specific server 9.9.9.11? n resolved .conf i had added only one server 9.9.9.11#dns11.quad9.net. not any other server. may be domain mentioned in network connection is taking care of other servers. or ipv6 is taking care of. any suggestion?
This is IPV6 connection after enabled. IPV4 is disabled for 853 port by ISP suddenly.It was working for sometime.
Given the care you’re taking here, I wonder if you’d find value in a VPN.
With respect to your ISP allegedly blocking port 843, you might consider exploring alternative secure DNS options like DoH (DNS over HTTPS) or DNSCrypt. DoH queries will blend in with standard web traffic, so unlikely to be blocked or filtered by your ISP.
See Arch Wiki DNS-over-HTTPS.
See here for the respective Quad9 DoH addresses:
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