"eportal.incometax.gov.in" website is not working with WSS when connected outside India
OR
"incometax.gov.in" website gives dns_server_failure when accessed via WSS.
This is a known issue.
WSS uses DNSSEC for security. DNSSEC strengthens authentication in DNS using digital signatures based on public key cryptography.
"*.incometax.gov.in" website resolves fine with regular DNS.
But it has problems with DNSSEC.
To resolve DNS query of eportal.incometax.gov.in, we are visiting ns01.incometax.gov.in and ns02.incometax.gov.in . They are unresolvable by our DNSSEC. This is problem with DNS configuration from the website owners.
You can check it here:
https://dnsviz.net/d/ns01.incometax.gov.in/dnssec/
Currently if you are connecting to our mumbai and delhi data center, the website will work. If you are connecting to any other data center, we can only recommend to Bypass the domain (incometax.gov.in) from WSS portal.
If you are using IPSec access method, you will need to bypass the domain at firewall/vpn device.
If you are using proxysg forwarding to wss, you will need to bypass the domain at proxysg.