the server settings are in /TitleSpecificSettings.xml & /XboxLIVESettings.xml (see below)

i cant seem to get anything to connect.

the xap is here if anyone wants to play...

https://www.box.com/s/njoz16zku414dgd9o0cg

[code=/TitleSpecificSettings.xml]<?xml version="1.0" encoding="utf-8" ?>
<XnaContent xmlns:Generic="System.Collections.Generic">
<!-- Title Specific Settings -->
<!-- Environment: Production -->
<!-- Title Name : Crackdown 2: Project Sunburst -->
<!-- Title ID : 4D5308B7 -->
<Asset Type="Generic:Dictionary[string,string]">
<Item>
<Key>SunburstLspRoot</Key>
<Value>https://projectsunburst.seedpowered.com/Sunburst.svc/</Value>
</Item>
</Asset>
</XnaContent>[/code]

[code=XboxLIVESettings.xml]<?xml version="1.0" encoding="utf-8" ?>
<XnaContent xmlns:Generic="System.Collections.Generic">
<!-- Xbox LIVE on Windows Phone environment-specific settings -->
<!-- Environment: Production -->
<!-- ______ _ _ _ -->
<!-- | ___ \ | | | | (_) -->
<!-- | |_/ /_ __ ___ __| |_ _ ___| |_ _ ___ _ __ -->
<!-- | __/| '__/ _ \ / _` | | | |/ __| __| |/ _ \| '_ \ -->
<!-- | | | | | (_) | (_| | |_| | (__| |_| | (_) | | | | -->
<!-- \_| |_| \___/ \__,_|\__,_|\___|\__|_|\___/|_| |_| -->
<!-- -->
<!-- Version: September 2010 -->
<!-- THIS FILE IS FOR INTERNAL USE ONLY AND SHOULD -->
<!-- NOT BE PROVIDED TO EXTERNAL PARTNERS. -->
<Asset Type="Generic:Dictionary[string,string]">

<!-- Xbox LIVE Environment -->
<Item>
<Key>LIVEEnvironment</Key>
<Value>Production</Value>
</Item>



<!-- 150 x 300 Full-body avatar image. Replace "{GAMERTAG}" with player's gamertag -->
<!-- Public Usage Allowed -->
<Item>
<Key>2DAvatarBodyURL</Key>
<Value>http://avatar.xboxlive.com/avatar/{GAMERTAG}/avatar-body.png</Value>
</Item>

<!-- 64 x 64 head shot avatar image. Replace "{GAMERTAG}" with player's gamertag -->
<!-- Public Usage Allowed -->
<Item>
<Key>2DAvatar64URL</Key>
<Value>http://avatar.xboxlive.com/avatar/{GAMERTAG}/avatarpic-l.png</Value>
</Item>

<!-- 32 x 32 head shot avatar image. Replace "{GAMERTAG}" with player's gamertag -->
<!-- Public Usage Allowed -->
<Item>
<Key>2DAvatar32URL</Key>
<Value>http://avatar.xboxlive.com/avatar/{GAMERTAG}/avatarpic-s.png</Value>
</Item>



<!-- 3D Avatars Authenticated Manifest Read -->
<!-- Approved Titles Only -->
<Item>
<Key>3DAvatarAuthReadURL</Key>
<Value>https://avatarread-part.xboxlive.com/Manifest.svc</Value>
</Item>

<!-- 3D Avatars UNauthenticated Manifest Read -->
<!-- Approved Titles Only -->
<Item>
<Key>3DAvatarReadURL</Key>
<Value>http://avatarread.xboxlive.com/Manifest.svc</Value>
</Item>

<!-- 3D Avatars Get Avatar Closet Manifest -->
<!-- Approved Titles Only -->
<Item>
<Key>3DAvatarClosetURL</Key>
<Value>https://avatarcloset-part.xboxlive.com/Closet.svc</Value>
</Item>

<!-- 3D Avatars Update Manifest -->
<!-- Approved Titles Only -->
<Item>
<Key>3DAvatarWriteURL</Key>
<Value>https://avatarwrite-part.xboxlive.com/Manifest.svc</Value>
</Item>

<!-- 3D Avatars Update Posed Avatar Picture -->
<!-- Approved Titles Only -->
<Item>
<Key>3DAvatarSetPictureURL</Key>
<Value>https://avatarwrite-part.xboxlive.com/GamerPic.svc</Value>
</Item>



<!-- Xbox LIVE Friends Service -->
<!-- Approved Titles Only -->
<Item>
<Key>FriendsURL</Key>
<Value>https://uds-part.xboxlive.com/Friend.svc</Value>
</Item>

<!-- Xbox LIVE Game Data Service -->
<!-- Approved Titles Only -->
<Item>
<Key>GameDataURL</Key>
<Value>https://uds-part.xboxlive.com/GameData.svc</Value>
</Item>

<!-- Xbox LIVE Messaging Service -->
<!-- Approved Titles Only -->
<Item>
<Key>MessagingURL</Key>
<Value>https://uds-part.xboxlive.com/Message.svc</Value>
</Item>

<!-- Xbox LIVE Presence Service -->
<!-- Approved Titles Only -->
<Item>
<Key>PresenceURL</Key>
<Value>https://uds-part.xboxlive.com/Presence.svc</Value>
</Item>

<!-- Xbox LIVE Profile Service -->
<!-- Approved Titles Only -->
<Item>
<Key>ProfileURL</Key>
<Value>https://uds-part.xboxlive.com/Profile.svc</Value>
</Item>



<!-- Xbox LIVE Asynchronous Multiplayer Sessions Service -->
<!-- Approved Titles Only -->
<Item>
<Key>SessionsURL</Key>
<Value>https://sessions.xboxlive.com/Sessions.svc</Value>
</Item>

<!-- Xbox LIVE Asynchronous Multiplayer GameState Service -->
<!-- Approved Titles Only -->
<Item>
<Key>GameStateURL</Key>
<Value>https://sessions.xboxlive.com/GameState.svc</Value>
</Item>
</Asset>
</XnaContent>[/code]

Did you get it working ?