yaroslavambrozyak opened a new issue, #527:
URL: https://github.com/apache/mina-sshd/issues/527
### Version
2.9.2
### Bug description
Hi, recently after migrating from JSch lib to mina we started facing a
connection reset by peer issue (log below). Our service writes small files up
to 10kb to a SFTP server. The problem occurs only on a high load when we get
around 50 requests within one minute, so out of 50 we get around 3-4 failed. We
don't face this when using JSch lib on the same load and environment.
We use Spring integration sftp package (which uses mina-sshd under the hood)
and haven't configured anything else explicitly, all settings are default.
I could also observe these logs in FileZilla when I tried to connect to the
server during the high load test
```
Error: FATAL ERROR: Remote side sent disconnect message
Error: type 12 (too many connections):
```
As I understand it creates many connections so after some time the server
starts to refuse to accept a new one, but it is not clear enough why we don't
have the same when we use JSch lib.
Do you have any tips/docs that we can use to try different approaches or
configurations to solve this?
### Actual behavior
Connection reset by peer exception on high-load
### Expected behavior
No issues on high-loads
### Relevant log output
```Shell
Caused by: java.io.IOException: Connection reset by peer
at java.base/sun.nio.ch.FileDispatcherImpl.write0(Native Method)
at java.base/sun.nio.ch.SocketDispatcher.write(Unknown Source)
at java.base/sun.nio.ch.IOUtil.writeFromNativeBuffer(Unknown Source)
at java.base/sun.nio.ch.IOUtil.write(Unknown Source)
at java.base/sun.nio.ch.IOUtil.write(Unknown Source)
at
java.base/sun.nio.ch.UnixAsynchronousSocketChannelImpl.implWrite(Unknown Source)
at java.base/sun.nio.ch.AsynchronousSocketChannelImpl.write(Unknown
Source)
at java.base/sun.nio.ch.AsynchronousSocketChannelImpl.write(Unknown
Source)
at
org.apache.sshd.common.io.nio2.Nio2Session.doWriteCycle(Nio2Session.java:534)
at
org.apache.sshd.common.io.nio2.Nio2Session.startWriting(Nio2Session.java:516)
at
org.apache.sshd.common.io.nio2.Nio2Session.writeBuffer(Nio2Session.java:191)
at
org.apache.sshd.common.session.helpers.AbstractSession.doWritePacket(AbstractSession.java:1154)
at
org.apache.sshd.common.session.helpers.KeyExchangeMessageHandler.writePacket(KeyExchangeMessageHandler.java:244)
at
org.apache.sshd.common.session.helpers.AbstractSession.writePacket(AbstractSession.java:1066)
at org.apache.sshd.client.kex.DHGClient.init(DHGClient.java:107)
at
org.apache.sshd.common.session.helpers.AbstractSession.doKexNegotiation(AbstractSession.java:928)
at
org.apache.sshd.common.session.helpers.AbstractSession.handleKexInit(AbstractSession.java:867)
at
org.apache.sshd.common.session.helpers.AbstractSession.doHandleMessage(AbstractSession.java:596)
at
org.apache.sshd.common.session.helpers.AbstractSession.lambda$handleMessage$0(AbstractSession.java:545)
at
org.apache.sshd.common.util.threads.ThreadUtils.runAsInternal(ThreadUtils.java:68)
at
org.apache.sshd.common.session.helpers.AbstractSession.handleMessage(AbstractSession.java:544)
at
org.apache.sshd.common.session.helpers.AbstractSession.decode(AbstractSession.java:1688)
at
org.apache.sshd.common.session.helpers.AbstractSession.messageReceived(AbstractSession.java:505)
at
org.apache.sshd.common.session.helpers.AbstractSessionIoHandler.messageReceived(AbstractSessionIoHandler.java:64)
at
org.apache.sshd.common.io.nio2.Nio2Session.handleReadCycleCompletion(Nio2Session.java:409)
at
org.apache.sshd.common.io.nio2.Nio2Session$1.onCompleted(Nio2Session.java:382)
at
org.apache.sshd.common.io.nio2.Nio2Session$1.onCompleted(Nio2Session.java:377)
at
org.apache.sshd.common.io.nio2.Nio2CompletionHandler.lambda$completed$0(Nio2CompletionHandler.java:38)
at java.base/java.security.AccessController.doPrivileged(Unknown Source)
at
org.apache.sshd.common.io.nio2.Nio2CompletionHandler.completed(Nio2CompletionHandler.java:37)
at java.base/sun.nio.ch.Invoker.invokeUnchecked(Unknown Source)
at java.base/sun.nio.ch.Invoker$2.run(Unknown Source)
at java.base/sun.nio.ch.AsynchronousChannelGroupImpl$1.run(Unknown
Source)
at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown
Source)
at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown
Source)
... 1 more
```
```
### Other information
Java 17
Spring Boot 3.1.2
Apache mina sshd 2.9.2
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