localhost not getting resolved from c# code

Question

I am facing a weird issue ,

We have a GET URL like below http://localhost:12345/xxxxx/abcsd . If am accessing the URL from the browser it's works fine. But accessing through the code It's giving an error

No connection could be made because the target machine actively refused it 127.0.0.1:12345

And making it more suprise , If I start fiddler the URL works from code.

I spent some good amount of time analyzing this issue not sure , what happening here . Any guess ?

Can you show the code where you are accessing the url?

Praveen Paulose
– Praveen Paulose

2015-11-12 13:03:33 +00:00
Commented Nov 12, 2015 at 13:03 — Praveen Paulose
– Praveen Paulose, Commented Nov 12, 2015 at 13:03

EricLaw · Accepted Answer · 2015-11-18 19:41:52Z

1

The most likely explanation is that the code in question is blocked by a firewall and thus the connection is refused because the application doesn't have permission to reach the target.

The next most likely explanation is that the target is listening only on IPv6 (not IPv4) and thus the connection fails when the DNS resolution returns the IPv4 address rather than the IPv6 address.

answered Nov 18, 2015 at 19:41

EricLaw

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