muc80337_2

I suspect that the India target site refuses Telekom  fixed line IP addresses, a geo blocking.

S.th. that Telekom would not be able to fix.

That's not it, the DT DNS server can't resolve eportal.incometax.gov.in:

~$ nslookup eportal.incometax.gov.in
Server:         127.0.0.53
Address:        127.0.0.53#53

** server can't find eportal.incometax.gov.in: SERVFAIL

Other DNS servers like Google's are able to do that:

~$ nslookup eportal.incometax.gov.in 8.8.8.8
Server:         8.8.8.8
Address:        8.8.8.8#53

Non-authoritative answer:
Name:   eportal.incometax.gov.in
Address: 43.239.61.11
Name:   eportal.incometax.gov.in
Address: 43.239.61.139

Now as to why that is...I have no idea.

@shukla.sandeep Most routers allow the configuration of alternative DNS servers via their WebUI. Changing the DNS server in the router from "what the provider configures during connection setup" to "8.8.8.8" might help.

shukla.sandeep

I am unable to access a website from the Telekom home internet connection.  The website is https://eportal.incometax.gov.in/

No problems here. I have configured my router to use the public DNS resolver from Quad9 (quad9.net).

Best wishes,

Thomas