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 tried the following:

• IPv6 completely off, if I ping localhost I get back 127.0.0.1
• Firewall exceptions added for eclipse.exe and adb.exe
• Adb killed and re-started
• Reset Adb from eclipse
• Virus scanners off (temporarily)

Nothing seems to help, I'm lost. Besides, if I try to update I get the error message also:

Some sites could not be found. See the error log for more detail. Unable to read repository at http://dl-ssl.google.com/android/eclipse/content.xml. Permission denied: connect

.. I can browse from Eclipse (with the Internal Web Browser perspective), so there is an internet connection. Furthermore, no proxies, just a direct connection.

Solution 1

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

Solution 2

My solution was: Terminate my proxifier.exe

I guess eclipse doesn't like proxies

Solution 3

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.

Solution 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

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Comments

[Kees Koenen]

Comment; I found that Win7 re-enables my Teredo device after each boot. Even when I deinstall. So I made a batchfile (run as Administrator) which issues the following commands : >netsh interface teredo set state disabled >"D:\Program Files (x86)\Eclipse\eclipse.exe"

[Mahm00d]

I confirm Eclipse doesn't like proxies! This did it for me, too. Thanks!