Smbclient sends no frames outside local VLAN

I'm trying to print on my company's printer accessible via samba
Whenever I try to access the print server via smbclient I get:
pc-salsa-info-092:py yannis$ smbclient -L vss-cups-03.priv.enst-bretagne.fr -U yharalam
Error connecting to 10.29.90.8 (Host is down)
Connection to vss-cups-03.priv.enst-bretagne.fr failed (Error NTSTATUS_ACCESSDENIED)
The print server IP is outside my VLAN (my IP is 10.66.145.92 and the mask 255.255.0.0). When I do an smbclient to a machine in my VLAN I get a quite different result:
pc-salsa-info-092:py yannis$ smbclient -L 10.66.145.90 -U yharalam
timeout connecting to 10.66.145.90:445
timeout connecting to 10.66.145.90:139
Error connecting to 10.66.145.90 (Operation already in progress)
Connection to 10.66.145.90 failed (Error NTSTATUS_ACCESSDENIED)
Which means that the 10.66.145.90 is seen while the 10.29.90.8 print server is not.
Surprisingly, when I do a tcpdump, I see outgoing frames in the first case, but not in the second. In other words: when attempting a smb connection outside my VLAN, MacOS X will not even send a single frame.
My firewall is deactivated. What can be the cause of this refusal to do a smb connection??
Thanks in advance for any hint!

The problem came from Little Snitch.

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