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Well this is a fun one. I just downloaded the regular minecraft version on my PC. I am running Windows 10. I am using Norton Antivirus but disabled firewall and antivirus. I also added ports 26000-28000 to my router as well as 25565.

I have uninstalled java and minecraft, rebooted, and reinstalled them both. I even tried putting my computer in the DMZ.

Nothing has worked. My logs are below. Please help!

[17:08:04] [MCO Compatability Checker #1/INFO]: Realms is available for this user
[17:08:13] [Realms-connect-task/ERROR]: Couldn't connect to world
java.lang.IllegalStateException: failed to create a child event loop
at io.netty.util.concurrent.MultithreadEventExecutorGroup.<init>(MultithreadEventExecutorGroup.java:68) ~[netty-all-4.0.23.Final.jar:4.0.23.Final]
at io.netty.channel.MultithreadEventLoopGroup.<init>(MultithreadEventLoopGroup.java:49) ~[netty-all-4.0.23.Final.jar:4.0.23.Final]
at io.netty.channel.nio.NioEventLoopGroup.<init>(NioEventLoopGroup.java:61) ~[netty-all-4.0.23.Final.jar:4.0.23.Final]
at io.netty.channel.nio.NioEventLoopGroup.<init>(NioEventLoopGroup.java:52) ~[netty-all-4.0.23.Final.jar:4.0.23.Final]
at er$1.a(SourceFile:62) ~[1.11.2.jar:?]
at er$1.b(SourceFile:59) ~[1.11.2.jar:?]
at op.c(SourceFile:10) ~[1.11.2.jar:?]
at er.a(SourceFile:275) ~[1.11.2.jar:?]
at net.minecraft.realms.RealmsConnect$1.run(SourceFile:42) [1.11.2.jar:?]
Caused by: io.netty.channel.ChannelException: failed to open a new selector
at io.netty.channel.nio.NioEventLoop.openSelector(NioEventLoop.java:128) ~[netty-all-4.0.23.Final.jar:4.0.23.Final]
at io.netty.channel.nio.NioEventLoop.<init>(NioEventLoop.java:120) ~[netty-all-4.0.23.Final.jar:4.0.23.Final]
at io.netty.channel.nio.NioEventLoopGroup.newChild(NioEventLoopGroup.java:87) ~[netty-all-4.0.23.Final.jar:4.0.23.Final]
at io.netty.util.concurrent.MultithreadEventExecutorGroup.<init>(MultithreadEventExecutorGroup.java:64) ~[netty-all-4.0.23.Final.jar:4.0.23.Final]
... 8 more
Caused by: java.io.IOException: Unable to establish loopback connection
at sun.nio.ch.PipeImpl$Initializer.run(PipeImpl.java:101) ~[?:1.8.0_25]
at sun.nio.ch.PipeImpl$Initializer.run(PipeImpl.java:68) ~[?:1.8.0_25]
at java.security.AccessController.doPrivileged(Native Method) ~[?:1.8.0_25]
at sun.nio.ch.PipeImpl.<init>(PipeImpl.java:170) ~[?:1.8.0_25]
at sun.nio.ch.SelectorProviderImpl.openPipe(SelectorProviderImpl.java:50) ~[?:1.8.0_25]
at java.nio.channels.Pipe.open(Pipe.java:155) ~[?:1.8.0_25]
at sun.nio.ch.WindowsSelectorImpl.<init>(WindowsSelectorImpl.java:127) ~[?:1.8.0_25]
at sun.nio.ch.WindowsSelectorProvider.openSelector(WindowsSelectorProvider.java:44) ~[?:1.8.0_25]
at io.netty.channel.nio.NioEventLoop.openSelector(NioEventLoop.java:126) ~[netty-all-4.0.23.Final.jar:4.0.23.Final]
at io.netty.channel.nio.NioEventLoop.<init>(NioEventLoop.java:120) ~[netty-all-4.0.23.Final.jar:4.0.23.Final]
at io.netty.channel.nio.NioEventLoopGroup.newChild(NioEventLoopGroup.java:87) ~[netty-all-4.0.23.Final.jar:4.0.23.Final]
at io.netty.util.concurrent.MultithreadEventExecutorGroup.<init>(MultithreadEventExecutorGroup.java:64) ~[netty-all-4.0.23.Final.jar:4.0.23.Final]
... 8 more
Caused by: java.net.SocketException: Permission denied: connect
at sun.nio.ch.Net.connect0(Native Method) ~[?:1.8.0_25]
at sun.nio.ch.Net.connect(Net.java:457) ~[?:1.8.0_25]
at sun.nio.ch.Net.connect(Net.java:449) ~[?:1.8.0_25]
at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:647) ~[?:1.8.0_25]
at java.nio.channels.SocketChannel.open(SocketChannel.java:189) ~[?:1.8.0_25]
at sun.nio.ch.PipeImpl$Initializer$LoopbackConnector.run(PipeImpl.java:130) ~[?:1.8.0_25]
at sun.nio.ch.PipeImpl$Initializer.run(PipeImpl.java:83) ~[?:1.8.0_25]
at sun.nio.ch.PipeImpl$Initializer.run(PipeImpl.java:68) ~[?:1.8.0_25]
at java.security.AccessController.doPrivileged(Native Method) ~[?:1.8.0_25]
at sun.nio.ch.PipeImpl.<init>(PipeImpl.java:170) ~[?:1.8.0_25]
at sun.nio.ch.SelectorProviderImpl.openPipe(SelectorProviderImpl.java:50) ~[?:1.8.0_25]
at java.nio.channels.Pipe.open(Pipe.java:155) ~[?:1.8.0_25]
at sun.nio.ch.WindowsSelectorImpl.<init>(WindowsSelectorImpl.java:127) ~[?:1.8.0_25]
at sun.nio.ch.WindowsSelectorProvider.openSelector(WindowsSelectorProvider.java:44) ~[?:1.8.0_25]
at io.netty.channel.nio.NioEventLoop.openSelector(NioEventLoop.java:126) ~[netty-all-4.0.23.Final.jar:4.0.23.Final]
at io.netty.channel.nio.NioEventLoop.<init>(NioEventLoop.java:120) ~[netty-all-4.0.23.Final.jar:4.0.23.Final]
at io.netty.channel.nio.NioEventLoopGroup.newChild(NioEventLoopGroup.java:87) ~[netty-all-4.0.23.Final.jar:4.0.23.Final]
at io.netty.util.concurrent.MultithreadEventExecutorGroup.<init>(MultithreadEventExecutorGroup.java:64) ~[netty-all-4.0.23.Final.jar:4.0.23.Final]
... 8 more
[17:08:43] [Realms-connect-task/ERROR]: Couldn't connect to world
java.lang.NullPointerException: group
at io.netty.bootstrap.AbstractBootstrap.group(AbstractBootstrap.java:80) ~[netty-all-4.0.23.Final.jar:?]
at er.a(SourceFile:275) ~[1.11.2.jar:?]
at net.minecraft.realms.RealmsConnect$1.run(SourceFile:42) [1.11.2.jar:?]
[17:08:50] [Realms-connect-task/ERROR]: Couldn't connect to world
java.lang.NullPointerException: group
at io.netty.bootstrap.AbstractBootstrap.group(AbstractBootstrap.java:80) ~[netty-all-4.0.23.Final.jar:?]
at er.a(SourceFile:275) ~[1.11.2.jar:?]
at net.minecraft.realms.RealmsConnect$1.run(SourceFile:42) [1.11.2.jar:?]

Thanks. Weird I tried to play just single player and it instantly crashes upon building terrain! Is that Norton as well?

---- Minecraft Crash Report ----
// I blame Dinnerbone.

Time: 1/1/17 6:57 PM
Description: Updating screen events

java.lang.IllegalStateException: failed to create a child event loop
at io.netty.util.concurrent.MultithreadEventExecutorGroup.<init>(MultithreadEventExecutorGroup.java:68)
at io.netty.channel.MultithreadEventLoopGroup.<init>(MultithreadEventLoopGroup.java:49)
at io.netty.channel.nio.NioEventLoopGroup.<init>(NioEventLoopGroup.java:61)
at io.netty.channel.nio.NioEventLoopGroup.<init>(NioEventLoopGroup.java:52)
at mh$1.a(SourceFile:61)
at mh$1.b(SourceFile:58)
at op.c(SourceFile:10)
at mh.a(SourceFile:152)
at bes.a(SourceFile:2162)
at bjy.a(SourceFile:212)
at bho.a(SourceFile:341)
at bjy.a(SourceFile:352)
at bho.k(SourceFile:404)
at bho.p(SourceFile:381)
at bes.t(SourceFile:1586)
at bes.av(SourceFile:970)
at bes.a(SourceFile:398)
at net.minecraft.client.main.Main.main(SourceFile:124)
Caused by: io.netty.channel.ChannelException: failed to open a new selector
at io.netty.channel.nio.NioEventLoop.openSelector(NioEventLoop.java:128)
at io.netty.channel.nio.NioEventLoop.<init>(NioEventLoop.java:120)
at io.netty.channel.nio.NioEventLoopGroup.newChild(NioEventLoopGroup.java:87)
at io.netty.util.concurrent.MultithreadEventExecutorGroup.<init>(MultithreadEventExecutorGroup.java:64)
... 17 more
Caused by: java.io.IOException: Unable to establish loopback connection
at sun.nio.ch.PipeImpl$Initializer.run(PipeImpl.java:101)
at sun.nio.ch.PipeImpl$Initializer.run(PipeImpl.java:68)
at java.security.AccessController.doPrivileged(Native Method)
at sun.nio.ch.PipeImpl.<init>(PipeImpl.java:170)
at sun.nio.ch.SelectorProviderImpl.openPipe(SelectorProviderImpl.java:50)
at java.nio.channels.Pipe.open(Pipe.java:155)
at sun.nio.ch.WindowsSelectorImpl.<init>(WindowsSelectorImpl.java:127)
at sun.nio.ch.WindowsSelectorProvider.openSelector(WindowsSelectorProvider.java:44)
at io.netty.channel.nio.NioEventLoop.openSelector(NioEventLoop.java:126)
... 20 more
Caused by: java.net.SocketException: Permission denied: connect
at sun.nio.ch.Net.connect0(Native Method)
at sun.nio.ch.Net.connect(Net.java:457)
at sun.nio.ch.Net.connect(Net.java:449)
at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:647)
at java.nio.channels.SocketChannel.open(SocketChannel.java:189)
at sun.nio.ch.PipeImpl$Initializer$LoopbackConnector.run(PipeImpl.java:130)
at sun.nio.ch.PipeImpl$Initializer.run(PipeImpl.java:83)
... 28 more

A detailed walkthrough of the error, its code path and all known details is as follows:
---------------------------------------------------------------------------------------

-- Head --
Thread: Client thread
Stacktrace:
at io.netty.util.concurrent.MultithreadEventExecutorGroup.<init>(MultithreadEventExecutorGroup.java:68)
at io.netty.channel.MultithreadEventLoopGroup.<init>(MultithreadEventLoopGroup.java:49)
at io.netty.channel.nio.NioEventLoopGroup.<init>(NioEventLoopGroup.java:61)
at io.netty.channel.nio.NioEventLoopGroup.<init>(NioEventLoopGroup.java:52)
at mh$1.a(SourceFile:61)
at mh$1.b(SourceFile:58)
at op.c(SourceFile:10)
at mh.a(SourceFile:152)
at bes.a(SourceFile:2162)
at bjy.a(SourceFile:212)
at bho.a(SourceFile:341)
at bjy.a(SourceFile:352)
at bho.k(SourceFile:404)
at bho.p(SourceFile:381)

-- Affected screen --
Details:
Screen name: bhm
Stacktrace:
at bes.t(SourceFile:1586)
at bes.av(SourceFile:970)
at bes.a(SourceFile:398)
at net.minecraft.client.main.Main.main(SourceFile:124)

-- System Details --
Details:
Minecraft Version: 1.11.2
Operating System: Windows 10 (amd64) version 10.0
Java Version: 1.8.0_25, Oracle Corporation
Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
Memory: 134642024 bytes (128 MB) / 269590528 bytes (257 MB) up to 1060372480 bytes (1011 MB)
JVM Flags: 6 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx1G -XX:+UseConcMarkSweepGC -XX:+CMSIncrementalMode -XX:-UseAdaptiveSizePolicy -Xmn128M
IntCache: cache: 0, tcache: 0, allocated: 13, tallocated: 95
Launched Version: 1.11.2
LWJGL: 2.9.4
OpenGL: AMD Radeon R9 200 Series GL version 4.5.14008 Compatibility Profile Context 21.19.137.1, ATI Technologies Inc.
GL Caps: Using GL 1.3 multitexturing.
Using GL 1.3 texture combiners.
Using framebuffer objects because OpenGL 3.0 is supported and separate blending is supported.
Shaders are available because OpenGL 2.1 is supported.
VBOs are available because OpenGL 1.5 is supported.

Using VBOs: Yes
Is Modded: Probably not. Jar signature remains and client brand is untouched.
Type: Client (map_client.txt)
Resource Packs:
Current Language: English (US)
Profiler Position: N/A (disabled)
CPU: 8x AMD FX(tm)-8320 Eight-Core Processor

Unfortunately uninstalling Norton and rebooting did not resolve either issue

Quote from webrosc»

To completely uninstall Norton Internet Security, use this tool: ftp://ftp.symantec.com/public/english_us_canada/removal_tools/Norton_Removal_Tool.exe

Thank you. I performed the clean uninstall. I reinstalled Minecraft afterwards as well. Same 2 issues.

Quote from dbong123»

Thank you. I performed the clean uninstall. I reinstalled Minecraft afterwards as well. Same 2 issues.

Please ignore, i forgot to quote you

Quote from webrosc»

ok in that case please obtain a HJT log

Trend Micro HijackThis is a utility that is used to collect diagnostic reports of your computer to help narrow down an issue you may be having. Download: https://sourceforge.net/projects/hjt/files/2.0.5%20beta/HijackThis.exe/download
Run the program, choose "I accept", then "Do a scan and save a log file". After a while a text file will open. Copy everything, put the log on http://paste.ubuntu.com and give us the link.

did it work? my friend has the same issue but doesnt want to uninstall norton..

Quote from armanem»

did it work? my friend has the same issue but doesnt want to uninstall norton..