Enable dns_v4_first on

[flatspin (Ralf Jeckel)]

There is a known issue about wpad. Please see this discusion. Exactly your problem regarding the credentials.

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When a user whose workstation web browser has been configured (in a way or another) to use http://proxy.lan.example.com/wpad.dat as a proxy auto configuration script then he/she is:

• Presented a proxy authentication dialog
• The credentials, even when correctly entered, aren’t accepted