I see the following in the log when I start a client session on Windows. The client appears to be working OK but it seems like this is an issue.
2017-06-13T10:04:43,086 | WARN | sshd-SshServer[6c21e678]-nio2-thread-3 | | 49 - org.jline - 3.2.0 | Unable to retrieve infocmp for type dummy java.io.IOException: Cannot run program "infocmp": CreateProcess error=2, The system cannot find the file specified at java.lang.ProcessBuilder.start(ProcessBuilder.java:1048) ~[?:?] at org.jline.utils.InfoCmp.getInfoCmp(InfoCmp.java:547) ~[?:?] at org.jline.terminal.impl.AbstractTerminal.parseInfoCmp(AbstractTerminal.java:156) ~[?:?] at org.jline.terminal.impl.LineDisciplineTerminal.<init>(LineDisciplineTerminal.java:101) ~[?:?] at org.jline.terminal.impl.ExternalTerminal.<init>(ExternalTerminal.java:48) ~[?:?] at org.jline.terminal.impl.ExternalTerminal.<init>(ExternalTerminal.java:40) ~[?:?] at org.apache.karaf.shell.ssh.SshTerminal.<init>(SshTerminal.java:43) ~[?:?] at org.apache.karaf.shell.ssh.ShellFactoryImpl$ShellImpl.start(ShellFactoryImpl.java:103) ~[?:?] at org.apache.sshd.server.channel.ChannelSession.sendResponse(ChannelSession.java:363) ~[47:org.apache.sshd.core:1.4.0]