The IP isn't blocked (at either the Pi or McQ). I can traceroute to
McQ.
I tried nc, telnet and open_ssl to attempt connecting on port 587, and
they
all failed from NAS to McQ. However, they did work on Joe and Beta to
McQ.
I assume you used an IP address wth your test commands, or that DNS is
resolving correctly on NAS?
Otherwise, unless NAS has a local firewall and something changed there,
this is a strong indication that something along the network path is
preventing communication. I would check first locally on NAS with
`tcpdump` or `ngrep`:
1. That TCP packets are actually leaving NAS for the destination
2. What ICMP packets are coming back from hops
And then do the same on McQ...
--
Mark Lawrence
