# steam failed to bind to port 7777

**URL:** <https://forums.unrealengine.com/t/steam-failed-to-bind-to-port-7777/42300>\
**Category:** Blueprint\
**Tags:** unreal-engine\
**Created:** [September 20, 2015, 2:49am UTC](https://forums.unrealengine.com/t/steam-failed-to-bind-to-port-7777/42300 "2015-09-20T02:49:02Z")\
**Posts on this page:** 5\
**Page:** 1

<div class="post-metadata">

**Author:** ![arbopa](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@arbopa](https://forums.unrealengine.com/u/arbopa)\
**Post date:** [September 20, 2015, 2:49am UTC](https://forums.unrealengine.com/t/steam-failed-to-bind-to-port-7777/42300/1 "2015-09-20T02:49:02Z")

</div>

I have my defaultengine.ini set per Rama’s tutorial…

```auto

[/Script/Engine.GameEngine]
!NetDriverDefinitions=ClearArray
+NetDriverDefinitions=(DefName="GameNetDriver",DriverClassName="/Script/OnlineSubsystemSteam.SteamNetDriver",DriverClassNameFallback="/Script/OnlineSubsystemUtils.IpNetDriver")
 
[OnlineSubsystem]
DefaultPlatformService=Steam
PollingIntervalInMs=20
 
[OnlineSubsystemSteam]
bEnabled=true
SteamDevAppId=480
GameServerQueryPort=27015
bRelaunchInSteam=false
GameVersion=1.0.0.0
bVACEnabled=1
bAllowP2PPacketRelay=true
P2PConnectionTimeout=90
 
[/Script/OnlineSubsystemSteam.SteamNetDriver]
NetConnectionClassName="/Script/OnlineSubsystemSteam.SteamNetConnection"

```

The DLL’s are already where they are supposed to be per the instructions. This is a NON C++ project, blueprint only.

Run the packaged program and shift tab brings up the steam overlay fine.

Try to create session, it fails with a netdriverlistenerror. Log:

```auto

[2015.09.20-02.44.45:576][276]LogNet:Warning: Failed to init net driver ListenURL: /Game/Maps/Abandoned?listen?game=DM: SteamSockets: binding to port 7777 failed (0)
[2015.09.20-02.44.45:576][276]LogNet:Warning: Network Failure: GameNetDriver[NetDriverListenFailure]: SteamSockets: binding to port 7777 failed (0)
[2015.09.20-02.44.45:576][276]LogNet: NetworkFailure: NetDriverListenFailure, Error: 'SteamSockets: binding to port 7777 failed (0)'
[2015.09.20-02.44.45:577][276]LogWorld: Failed to listen: SteamSockets: binding to port 7777 failed (0)
[2015.09.20-02.44.45:577][276]LogNet:Error: LoadMap: failed to Listen(/Game/Maps/Abandoned?listen?game=DM)
[2015.09.20-02.44.45:580][276]LogWorld: Bringing World /Game/Maps/Abandoned.Abandoned up for play (max tick rate 0) at 2015.09.19-19.44.45
[2015.09.20-02.44.45:580][276]LogWorld: Bringing up level for play took: 0.002452
[2015.09.20-02.44.45:581][276]LogOnline:Warning: STEAM: Can't start an online session (Game) in state InProgress

```

So it is failing to bind to port 7777. Checked windows firewall, nothing there bad. So what else can cause this?

---

<div class="post-metadata">

**Author:** ![JmDevTx](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@JmDevTx](https://forums.unrealengine.com/u/JmDevTx)\
**Post date:** [September 20, 2015, 3:22am UTC](https://forums.unrealengine.com/t/steam-failed-to-bind-to-port-7777/42300/2 "2015-09-20T03:22:58Z")

</div>

I personally don’t know anything about this issue, but we’ll need to know a little bit more. Which tutorial are you following? Could you link it?

---

<div class="post-metadata">

**Author:** ![arbopa](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@arbopa](https://forums.unrealengine.com/u/arbopa)\
**Post date:** [September 20, 2015, 3:37am UTC](https://forums.unrealengine.com/t/steam-failed-to-bind-to-port-7777/42300/3 "2015-09-20T03:37:12Z")

</div>

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And running it from a packaged build, not the editor.

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<div class="post-metadata">

**Author:** ![arbopa](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@arbopa](https://forums.unrealengine.com/u/arbopa)\
**Post date:** [September 22, 2015, 2:32am UTC](https://forums.unrealengine.com/t/steam-failed-to-bind-to-port-7777/42300/4 "2015-09-22T02:32:59Z")

</div>

Nobody? …

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<div class="post-metadata">

**Author:** ![anonymous\_user\_01dd28a6](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@anonymous\_user\_01dd28a6](https://forums.unrealengine.com/u/anonymous_user_01dd28a6)\
**Post date:** [May 15, 2017, 4:18am UTC](https://forums.unrealengine.com/t/steam-failed-to-bind-to-port-7777/42300/5 "2017-05-15T04:18:47Z")

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With UE4.15 we had this bug.

Fix was in the DefaultEngine.ini  
change  
[/Script/Engine.Engine]  
to  
[/Script/Engine.GameEngine]