Andre Dietisheim [https://community.jboss.org/people/adietish] created the 
discussion

"Re: Unknown popup with username password prompt driving me nuts"

To view the discussion, visit: https://community.jboss.org/message/821178#821178

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Hi 


I'm very sure that you have some preferences settings for a proxy in Eclipse 
(Window->Preferences->Proxy). Assuming that you dont need a proxy then clearing 
those will prevent this dialog from popping up. 
If you need a proxy then things get more complicated. A bad design in the JDK, 
a very lacking default proxy plugin and several competing fixes cause Eclipse 
to behave differently depending on the plugins you have. The dialog you 
screenshotted is caused by the default Eclipse proxy support in 
org.eclipse.ui.net. It's limitations are very well known but none fixed those 
in the platform yet:


 https://bugs.eclipse.org/bugs/show_bug.cgi?id=196780 
https://bugs.eclipse.org/bugs/show_bug.cgi?id=196780


This very lacking plugin is overriden by EGit, Scout and others. Depending on 
which of these plugins you have, you will or wont get the above dialog. The 
best advice I can give you is to make sure that you have EGit installed (and 
make sure it's started: have some git shared projects in your workspace or open 
the "Git Repository Exploring" perspective" at least once). EGit overrides the 
default proxy plugin by a far superior plugin that prevents the above dialog 
from appearing.


If you need more details, the you can have a look at a very similar issue we 
ran into in OpenShift/JBoss Tools. The jira issue holds all informations and 
insights I collected when looking into this weirdness:
 https://issues.jboss.org/browse/JBIDE-12999 
https://issues.jboss.org/browse/JBIDE-12999


Cheers
André
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