accesso to 445 port vs 139

Occasional Visitor

In 2 different domains (2 different company) I'm trying to access from Win 2012 R2 to share folder by 445in Win2012 and I don't understand because I don't see any tries to 445 folder by wireshark.

I see only packets to 139 NetBIOS port and protocol gives this error: called name is not present

I ask myself bwcause server cannot to try to connect to 445 port even if telnet server 445 works successfully.

I try from another machine I'm able to connect to 445 port.

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