# Find Sessions / Join Sessions by IP address

**URL:** <https://forums.unrealengine.com/t/find-sessions-join-sessions-by-ip-address/19027>\
**Category:** Blueprint\
**Tags:** unreal-engine\
**Created:** [January 16, 2015, 1:00pm UTC](https://forums.unrealengine.com/t/find-sessions-join-sessions-by-ip-address/19027 "2015-01-16T13:00:58Z")\
**Posts on this page:** 1\
**Showing post:** 10

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**Author:** ![anonymous\_user\_1ef7131c](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@anonymous\_user\_1ef7131c](https://forums.unrealengine.com/u/anonymous_user_1ef7131c)\
**Post date:** [July 20, 2015, 3:47pm UTC](https://forums.unrealengine.com/t/find-sessions-join-sessions-by-ip-address/19027/10 "2015-07-20T15:47:48Z")

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Hello, when i create a session gives an error “Invalid or uninitialized OnlineSubsystem”. I read on this forum to add a line DefaultEngine.ini

[OnlineSubsystem] DefaultPlatformService=Null

but is no work.

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