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hierynomus / sshj

ssh, scp and sftp for java
Apache License 2.0
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Failed to connect to higher version OpenSSL server after configuring KeepAliveInterval #933

Open 2211898719 opened 3 months ago

2211898719 commented 3 months ago

ssh.getConnection().getKeepAlive().setKeepAliveInterval(60);

image

net.schmizz.sshj.transport.TransportException: strict KEX violation: unexpected packet type 2 (seqnr 1) at net.schmizz.sshj.transport.TransportImpl.gotDisconnect(TransportImpl.java:548) ~[sshj-0.38.0.jar:na] at net.schmizz.sshj.transport.TransportImpl.handle(TransportImpl.java:500) ~[sshj-0.38.0.jar:na] at net.schmizz.sshj.transport.Decoder.decode(Decoder.java:113) ~[sshj-0.38.0.jar:na] at net.schmizz.sshj.transport.Decoder.received(Decoder.java:200) ~[sshj-0.38.0.jar:na] at net.schmizz.sshj.transport.Reader.run(Reader.java:60) ~[sshj-0.38.0.jar:na]

`

com.hierynomus 
        <artifactId>sshj</artifactId>
        <version>0.38.0</version>
    </dependency>

`

2211898719 commented 3 months ago

image

derklaro commented 3 months ago

I had the same issue. Fixed by using a custom KeepAlive sender that just waits until the key exchange is completed before starting the hearbeat. This seems to be fixed with the KEEP_ALIVE keepalive strategy, but not when using HEARTBEAT: https://github.com/hierynomus/sshj/blob/c0d1519ee2deb7083aece6dfd0e4c0f6f8696504/src/main/java/net/schmizz/keepalive/KeepAliveRunner.java#L53-L59

2211898719 commented 3 months ago

How to customize it