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 ?

 If everything always fails just after password entry it's worth
setting up some kind of unauthenticated service at both ends (ftp with
anonymous or thttpd serving static pages - anything simple like that) and
see if it works with client on wifi server on wired and vice-versa. If that
works both ways then authentication is the place to look, if it fails then
it's a TCP problem - MTU mismatch perhaps.

> 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 ?

 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.

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