gethostbyname fails with error 111 (ECONNREFUSED)

The device does have network connectivity (WiFi and 3G).

C开发者_StackOverflow中文版alling gethostbyname() returns NULL with errno 111 (ECONNREFUSED).

The same call works fine on osx and windows.

What could be the problem?

Best,

---

You should add permission to use Internet in your AndroidManifest.xml:

<uses-permission android:name="android.permission.INTERNET"/>

---

The problem is most likely a not or wrong configured DNS server setting on your device. Be sure to check that. This is most probably a problem with your local WiFi network - probably there's no local DNS server.

Maybe you could also try disabling WiFi as DNS resolution should work automatically in your mobile network.

---

ECONNREFUSED suggests that the DNS resolver on your device may have tried failing over to TCP/IP (instead of UDP) because the answer was too long to fit in a normal UDP response packet.

If the configured DNS servers don't support inbound DNS requests over TCP you'd get that error.

Client apps can't normally get ECONNREFUSED from a UDP socket because they're stateless.