timeout exception after Sending SSH_MSG_KEXDH_INIT

Connecting to hungarian tax authority production server fails with timeout exception after:

`net.schmizz.sshj.transport.kex.Curve25519SHA256 - Sending SSH_MSG_KEXDH_INIT`

(DEBUG loging enabled):

```
019-01-10 16:08:51.950 [ZauzooScheduler_Worker-5] INFO net.schmizz.sshj.transport.random.BouncyCastleRandom - Generating random seed from SecureRandom.
2019-01-10 16:08:51.951 [ZauzooScheduler_Worker-5] DEBUG net.schmizz.sshj.transport.random.BouncyCastleRandom - Creating random seed took 0 ms
2019-01-10 16:08:51.999 [ZauzooScheduler_Worker-5] DEBUG net.schmizz.sshj.DefaultConfig - Available cipher factories: [aes128-cbc, aes128-ctr, aes192-cbc, aes192-ctr, aes256-cbc, aes256-ctr, blowfish-cbc, blowfish-ctr, cast128-cbc, cast128-ctr, idea-cbc, idea-ctr, serpent128-cbc, serpent128-ctr, serpent192-cbc, serpent192-ctr, serpent256-cbc, serpent256-ctr, 3des-cbc, 3des-ctr, twofish128-cbc, twofish128-ctr, twofish192-cbc, twofish192-ctr, twofish256-cbc, twofish256-ctr, twofish-cbc, arcfour, arcfour128, arcfour256]
2019-01-10 16:08:52.112 [ZauzooScheduler_Worker-5] INFO net.schmizz.sshj.transport.TransportImpl - Client identity string: SSH-2.0-SSHJ_0.26.0
2019-01-10 16:08:52.141 [ZauzooScheduler_Worker-5] WARN com.hierynomus.sshj.transport.IdentificationStringParser - Server identification has bad line ending, was expecting a '\r\n' however got: '4' (hex: 34)
2019-01-10 16:08:52.141 [ZauzooScheduler_Worker-5] WARN com.hierynomus.sshj.transport.IdentificationStringParser - Will treat the identification of this server 'SSH-2.0-OpenSSH_7.4p1 Debian-10+deb9u4' leniently
2019-01-10 16:08:52.141 [ZauzooScheduler_Worker-5] INFO net.schmizz.sshj.transport.TransportImpl - Server identity string: SSH-2.0-OpenSSH_7.4p1 Debian-10+deb9u4
2019-01-10 16:08:52.141 [ZauzooScheduler_Worker-5] DEBUG net.schmizz.concurrent.Promise - Setting <> to `null`
2019-01-10 16:08:52.141 [ZauzooScheduler_Worker-5] DEBUG net.schmizz.sshj.transport.KeyExchanger - Sending SSH_MSG_KEXINIT
2019-01-10 16:08:52.149 [ZauzooScheduler_Worker-5] DEBUG net.schmizz.concurrent.Promise - Setting <> to `SOME`
2019-01-10 16:08:52.149 [ZauzooScheduler_Worker-5] DEBUG net.schmizz.concurrent.Promise - Awaiting <>
2019-01-10 16:08:52.160 [reader] DEBUG net.schmizz.sshj.transport.KeyExchanger - Received SSH_MSG_KEXINIT
2019-01-10 16:08:52.161 [reader] DEBUG net.schmizz.sshj.transport.KeyExchanger - Negotiated algorithms: [ kex=curve25519-sha256@libssh.org; sig=ecdsa-sha2-nistp256; c2sCipher=aes128-ctr; s2cCipher=aes128-ctr; c2sMAC=hmac-sha1; s2cMAC=hmac-sha1; c2sComp=none; s2cComp=none ]
2019-01-10 16:08:52.217 [reader] DEBUG net.schmizz.sshj.transport.kex.Curve25519SHA256 - Sending SSH_MSG_KEXDH_INIT
2019-01-10 16:09:22.151 [ZauzooScheduler_Worker-5] INFO net.schmizz.sshj.transport.TransportImpl - Disconnected - BY_APPLICATION
2019-01-10 16:09:22.151 [ZauzooScheduler_Worker-5] DEBUG net.schmizz.sshj.transport.TransportImpl$NullService - Notified of net.schmizz.sshj.transport.TransportException: [BY_APPLICATION] Disconnected
2019-01-10 16:09:22.157 [ZauzooScheduler_Worker-5] DEBUG net.schmizz.sshj.transport.TransportImpl - Sending SSH_MSG_DISCONNECT: reason=[BY_APPLICATION], msg=[]
2019-01-10 16:09:22.157 [ZauzooScheduler_Worker-5] DEBUG net.schmizz.concurrent.Promise - Setting <> to `SOME`
2019-01-10 16:09:22.158 [reader] DEBUG net.schmizz.sshj.transport.Reader - Stopping
2019-01-10 16:09:22.170 [ZauzooScheduler_Worker-5] INFO org.quartz.core.JobRunShell - Job InvoiceToTax.InvoiceTaxVolvoHu threw a JobExecutionException:
org.quartz.JobExecutionException: java.lang.reflect.InvocationTargetException
at com.zauzoo.core.job.MdJob.execute(MdJob.java:70) ~[classes!/:0.1.0]
at org.quartz.core.JobRunShell.run(JobRunShell.java:202) [quartz-2.3.0.jar!/:?]
at org.quartz.simpl.SimpleThreadPool$WorkerThread.run(SimpleThreadPool.java:573) [quartz-2.3.0.jar!/:?]
Caused by: java.lang.reflect.InvocationTargetException
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.8.0_161]
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[?:1.8.0_161]
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:1.8.0_161]
at java.lang.reflect.Method.invoke(Method.java:498) ~[?:1.8.0_161]
at org.springframework.util.MethodInvoker.invoke(MethodInvoker.java:280) ~[spring-core-5.1.2.RELEASE.jar!/:5.1.2.RELEASE]
at com.zauzoo.core.job.MdJob.execute(MdJob.java:65) ~[classes!/:0.1.0]
... 2 more
Caused by: net.schmizz.sshj.transport.TransportException: Timeout expired
at net.schmizz.sshj.transport.TransportException$1.chain(TransportException.java:33) ~[sshj-0.26.0.jar!/:0.26.0]
at net.schmizz.sshj.transport.TransportException$1.chain(TransportException.java:27) ~[sshj-0.26.0.jar!/:0.26.0]
at net.schmizz.concurrent.Promise.retrieve(Promise.java:139) ~[sshj-0.26.0.jar!/:0.26.0]
at net.schmizz.concurrent.Event.await(Event.java:105) ~[sshj-0.26.0.jar!/:0.26.0]
at net.schmizz.sshj.transport.KeyExchanger.waitForDone(KeyExchanger.java:150) ~[sshj-0.26.0.jar!/:0.26.0]
at net.schmizz.sshj.transport.KeyExchanger.startKex(KeyExchanger.java:145) ~[sshj-0.26.0.jar!/:0.26.0]
at net.schmizz.sshj.transport.TransportImpl.doKex(TransportImpl.java:259) ~[sshj-0.26.0.jar!/:0.26.0]
at net.schmizz.sshj.SSHClient.doKex(SSHClient.java:784) ~[sshj-0.26.0.jar!/:0.26.0]
at net.schmizz.sshj.SSHClient.onConnect(SSHClient.java:772) ~[sshj-0.26.0.jar!/:0.26.0]
at net.schmizz.sshj.SocketClient.connect(SocketClient.java:127) ~[sshj-0.26.0.jar!/:0.26.0]
at com.zauzoo.core.common.service.MdCommonService.sftpOperation(MdCommonService.java:447) ~[classes!/:0.1.0]
at com.zauzoo.invoicing.service.InvoiceDistributionService.runInvoiceToTaxOneTenant_aroundBody6(InvoiceDistributionService.java:288) ~[classes!/:0.1.0]
at com.zauzoo.invoicing.service.InvoiceDistributionService$AjcClosure7.run(InvoiceDistributionService.java:1) ~[classes!/:0.1.0]
at org.springframework.transaction.aspectj.AbstractTransactionAspect.ajc$around$org_springframework_transaction_aspectj_AbstractTransactionAspect$1$2a73e96cproceed(AbstractTransactionAspect.aj:66) ~[spring-aspects-5.1.2.RELEASE.jar!/:5.1.2.RELEASE]
at org.springframework.transaction.aspectj.AbstractTransactionAspect$AbstractTransactionAspect$1.proceedWithInvocation(AbstractTransactionAspect.aj:72) ~[spring-aspects-5.1.2.RELEASE.jar!/:5.1.2.RELEASE]
at org.springframework.transaction.interceptor.TransactionAspectSupport.invokeWithinTransaction(TransactionAspectSupport.java:294) ~[spring-tx-5.1.2.RELEASE.jar!/:5.1.2.RELEASE]
at org.springframework.transaction.aspectj.AbstractTransactionAspect.ajc$around$org_springframework_transaction_aspectj_AbstractTransactionAspect$1$2a73e96c(AbstractTransactionAspect.aj:70) ~[spring-aspects-5.1.2.RELEASE.jar!/:5.1.2.RELEASE]
at com.zauzoo.invoicing.service.InvoiceDistributionService.runInvoiceToTaxOneTenant(InvoiceDistributionService.java:254) ~[classes!/:0.1.0]
at com.zauzoo.invoicing.service.InvoiceDistributionService.runInvoiceToTax(InvoiceDistributionService.java:248) ~[classes!/:0.1.0]
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.8.0_161]
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[?:1.8.0_161]
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:1.8.0_161]
at java.lang.reflect.Method.invoke(Method.java:498) ~[?:1.8.0_161]
at org.springframework.util.MethodInvoker.invoke(MethodInvoker.java:280) ~[spring-core-5.1.2.RELEASE.jar!/:5.1.2.RELEASE]
at com.zauzoo.core.job.MdJob.execute(MdJob.java:65) ~[classes!/:0.1.0]
... 2 more
Caused by: java.util.concurrent.TimeoutException: Timeout expired
at net.schmizz.concurrent.Promise.retrieve(Promise.java:139) ~[sshj-0.26.0.jar!/:0.26.0]
at net.schmizz.concurrent.Event.await(Event.java:105) ~[sshj-0.26.0.jar!/:0.26.0]
at net.schmizz.sshj.transport.KeyExchanger.waitForDone(KeyExchanger.java:150) ~[sshj-0.26.0.jar!/:0.26.0]
at net.schmizz.sshj.transport.KeyExchanger.startKex(KeyExchanger.java:145) ~[sshj-0.26.0.jar!/:0.26.0]
at net.schmizz.sshj.transport.TransportImpl.doKex(TransportImpl.java:259) ~[sshj-0.26.0.jar!/:0.26.0]
at net.schmizz.sshj.SSHClient.doKex(SSHClient.java:784) ~[sshj-0.26.0.jar!/:0.26.0]
at net.schmizz.sshj.SSHClient.onConnect(SSHClient.java:772) ~[sshj-0.26.0.jar!/:0.26.0]
at net.schmizz.sshj.SocketClient.connect(SocketClient.java:127) ~[sshj-0.26.0.jar!/:0.26.0]
```

Their test system works.
linux ssh/scp command can connect to both test and prod environment.

Using version 0.26.0