NativeIoException: readAddress(..) failed: Connection timed out

I’m facing an exception from Netty. My tests restarted the client and server throw out the netty exception.

io.netty.channel.unix.Errors$NativeIoException: readAddress(…) failed: Connection timed out at io.netty.channel.unix.Errors.newIOException(Errors.java:122) ~[netty-all-4.1.27.Final.jar:4.1.27.Final] at io.netty.channel.unix.Errors.ioResult(Errors.java:146) ~[netty-all-4.1.27.Final.jar:4.1.27.Final] at io.netty.channel.unix.FileDescriptor.readAddress(FileDescriptor.java:178) ~[netty-all-4.1.27.Final.jar:4.1.27.Final] at io.netty.channel.epoll.AbstractEpollChannel.doReadBytes(AbstractEpollChannel.java:343) ~[netty-all-4.1.27.Final.jar:4.1.27.Final] at io.netty.channel.epoll.AbstractEpollStreamChannel$EpollStreamUnsafe.epollInReady(AbstractEpollStreamChannel.java:794) [netty-all-4.1.27.Final.jar:4.1.27.Final] at io.netty.channel.epoll.EpollEventLoop.processReady(EpollEventLoop.java:417) [netty-all-4.1.27.Final.jar:4.1.27.Final] at io.netty.channel.epoll.EpollEventLoop.run(EpollEventLoop.java:317) [netty-all-4.1.27.Final.jar:4.1.27.Final] at io.netty.util.concurrent.SingleThreadEventExecutor$5.run(SingleThreadEventExecutor.java:884) [netty-all-4.1.27.Final.jar:4.1.27.Final] at java.lang.Thread.run(Thread.java:748) [?:1.8.0_192]

Expected behavior

Actual behavior

Steps to reproduce

Minimal yet complete reproducer code (or URL to code)

Netty version

JVM version (e.g. java -version)

OS version (e.g. uname -a)

[BBartosz]

@trajano Had the same problem, you have to set idleTimeout in grpcJava. I think also keepAlive might help you but in my case idleTimeout set to 2 minutes was better approach. Differences between them you can find in this answer: https://stackoverflow.com/questions/57930529/grpc-connection-use-keepalive-or-idletimeout

For people non using grpcJava and having this issue in netty: set the idleTimeout to smaller value than default (30 mins afaik)

[trajano]

I’m getting the same issue but with GRPC Java. It occurs randomly. I am trying to find the API documentation for readAddress it appears to be a DNS lookup which would mean it is before the call.