Sierra 10.12.6 problems with tcp incoming connections

[macnetico]

Hi all,

Does anyone know if is any problem with the network connectivity in Sierra? I've got a MacBook Pro retina and an Imac 27, the last one with a fresh installation, and I can't connect from one to another.

I've tried nearly everything but must be something stupid that I can't see...

The firewall is disabled (tried even enabling it and allowing all connections). Both computers are connected to my ISP router, but even tried with a direct ethernet cable from one to another.

I can ping to each other, and if I make a netstat I can see that I have Tcp ports listening:

netstat -an | grep LIST

tcp4 0 0 127.0.0.1.15292 *.* LISTEN
tcp46 0 0 *.3283 *.* LISTEN
tcp4 0 0 *.88 *.* LISTEN
tcp6 0 0 *.88 *.* LISTEN
tcp4 0 0 *.5900 *.* LISTEN
tcp6 0 0 *.5900 *.* LISTEN

And I can connect locally (example from the iMac):

ifconfig | grep 192.168.
inet 192.168.0.12 netmask 0xffffff00 broadcast 192.168.0.255
telnet 192.168.0.12 5900
Trying 192.168.0.12...
Connected to 192.168.0.12.
Escape character is '^]'.
RFB 003.889

Same locally in the MacBook Pro. But if I try to connect to the other computer from terminal with telnet I get a timeout:

telnet 192.168.0.15 5900
Trying 192.168.0.15...
telnet: connect to address 192.168.0.15: Operation timed out
telnet: Unable to connect to remote host

pfctl isn't enabled:
sudo pfctl -d
No ALTQ support in kernel
ALTQ related functions disabled
pfctl: pf not enabled

Any idea????