Failed to initialize monitor Thread: Unable to establish loopback connection

Question

Since yesterday suddenly my Eclipse does not work anymore. The error is \"Failed to initialize monitor Thread: Unable to establishe loopback connection\". I googled and trie

Answer 1

I got this problem after updating ADT and SDKs etc. I did solutions above but didn't work at all. So, update JDK from "JDK 8u25" to "JDK 8u45" and changed path setting (on Windows and Eclipse). This works for me perfectly!

Answer 2

Solution : turn off Teredo Tunneling Pseudo-Interface.

This probably converts IP4 to IPv6 addresses or something, resulting in an IPv6 address for your localhost (strange though, that a PING still results in IP4). Anyway, turning it off (Device manager > View > Show hidden devices > right click on Teredo > disable) solves the problem!

I found out by doing a ipconfig /all in the NON working situation. It showed :

Tunnel adapter Teredo Tunneling Pseudo-Interface:

Connection-specific DNS Suffix . :

Description . . . . . . . . . . . : Teredo Tunneling Pseudo-Interface

Physical Address. . . . . . . . . : 00-00-00-00-00-00-00-E0

DHCP Enabled. . . . . . . . . . . : No

Autoconfiguration Enabled . . . . : Yes

IPv6 Address. . . . . . . . . . . : 2001:0:5ef5:79fb:####:###:####:####(Preferred)

Link-local IPv6 Address . . . . . : fe80::3c47:###:####:#### (Preferred)

//edit : I guess it's a workaround untill Eclipse supports IPv6

Answer 3

My solution was: Terminate my proxifier.exe

I guess eclipse doesn't like proxies

Answer 4

Please check your anti virus blocked your eclipse,just give allow full access to eclipse on your antivirus security settings.

I faced the same problem in my eclipse and I am using k7 total security.Now the problem is solved

Answer 5

See https://stackoverflow.com/a/11327411/552958

I suspect you are using Java 7 which looks like it prefers IPV6 over IPV4. So you need to make sure that -Djava.net.preferIPv4Stack=true is a jvm argument.

Answer 6

I came here to add that in my case the solution that worked was to change eclipse.ini. I did try ALL the other answers in this thread and in other threads (reinstalling Eclipse, reinstalling the Android SDK, reinstalling Java 7 as well, rebooting, checking if Toledo was installed, etc). After an exhaustive google search, I came across this:

http://www.java.net/node/703177

However, I am not knowledgeable enough to understand why it worked. If anyone has any idea, please let me know. Thanks