North American Network Operators Group
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RE: Blocking port 135?

  • From: Jason Robertson
  • Date: Fri Aug 01 15:46:24 2003 
I also would recommend blocking these outbound, if they are not.  
Especially 137, it's so useful in finding Windows machines on other 
networks.

On 1 Aug 2003 at 14:09, Adi Linden wrote:

Date sent:      	Fri, 1 Aug 2003 14:09:52 -0500 (CDT)
From:           	Adi Linden <adil@adis.on.ca>
To:             	Bob German <bobgerman@irides.com>
Copies to:      	nanog@merit.edu
Subject:        	RE: Blocking port 135?

> 
> > Absolutely.  All of the NetBIOS ports: 135, 137, 138, 139, 445.  
> 
> Ports 137, 138, 139, 445 have been blocked for a long time. But port 135 
> wasn't until today...
> 
> Thanks!
> Adi
> 
>