On Sat, 20 Jan 2018 21:45:56 -0000 (UTC)
Jack Fearnley  wrote:

> On Sat, 20 Jan 2018 21:18:15 +0000, Ahem A Rivet's Shot wrote:
>
> > On Sat, 20 Jan 2018 20:42:45 -0000 (UTC)
> > Jack Fearnley  wrote:
> >
> >> All the units can ping each other so some communication is happening.
> >
> >  So the routing is good, but you may have a problem with TCP
> sessions
> > between wired and wireless or you may have an authentication problem, do
> > rlogin and telnet fail after password entry too ?
> >
> See below.
> >
> >> However, I cannot ssh from Ubuntu to RPi3 when RPi3 is on wifi.
> >
> >  Can you ssh from the RPi3 on wifi to the Ubuntu box on the wired
> > lAN ?
> >
> No.

 OK that really points to networking rather than client/server
config or authentication issues.

> >  I'm thinking this is some kind of problem between the wired and
> > wireless networks - are they routed or bridged together ?
> >
> >  Given that rlogin and telnet also have problems I wouldn't waste
> > time thinking about ssh config.
>
> To be precise
>
> telnet responds with
> telnet: Unable to connect to remote host: Connection refused

 Hmm, presumably telnetd is running and not blocked.

> rlogin responds with the same freeze as ssh.

 I think you'll find the answer in your wifi router configuration,
possibly MTU related.

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