Installation & Licensing

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jtbworld
Posts: 181
Registered: ‎08-03-2007
Message 1 of 5 (224 Views)

Why to specify a port number outside of the range 27000 through 27009 for lmgrd?

224 Views, 4 Replies
05-15-2012 10:45 PM

I found this addition in the License Administration Guide for FlexNet 11.10.1. “Note • For security purposes, best practice is not to use a default port for the license server. Instead, specify a port number outside of the range 27000 through 27009.” Anyone know why? (Other than what is mentioned in this post Potential Security Vulnerability in FlexNet license manager, but should this not be fixed?)

Jimmy Bergmark
JTB World - Software development and consulting
Specialities: AutoCAD, AutoCAD Architecture and Revit
http://www.jtbworld.com

JTB FlexReport - network license reports
http://www.jtbworld.com/jtbflexreport/index.htm
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TravisNave
Posts: 10,446
Registered: ‎01-14-2005
Message 2 of 5 (218 Views)

Re: Why to specify a port number outside of the range 27000 through 27009 for lm

05-16-2012 07:06 AM in reply to: jtbworld

Jimmy,


If I had to speculate, I'd say that because the master daemon lmgrd is known to use ports 27000~27009, it becomes easier to locate the vulerability by testing known ports.  Whereas if you used a non default port, it may get overlooked.  Just my two cents...

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jtbworld
Posts: 181
Registered: ‎08-03-2007
Message 3 of 5 (213 Views)

Re: Why to specify a port number outside of the range 27000 through 27009 for lm

05-16-2012 10:28 AM in reply to: TravisNave

Yes, that was my thought also but on the other hand there are not that many ports anyway to test on as it would be automated.

Jimmy Bergmark
JTB World - Software development and consulting
Specialities: AutoCAD, AutoCAD Architecture and Revit
http://www.jtbworld.com

JTB FlexReport - network license reports
http://www.jtbworld.com/jtbflexreport/index.htm
*Expert Elite*
TravisNave
Posts: 10,446
Registered: ‎01-14-2005
Message 4 of 5 (211 Views)

Re: Why to specify a port number outside of the range 27000 through 27009 for lm

05-16-2012 10:31 AM in reply to: jtbworld

Yeah, I am not even sure that there are any cases of this even being exploited other than something they may have found internally.  I'm certainly not going to make a habit on making the NLM use a different port.

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jtbworld
Posts: 181
Registered: ‎08-03-2007
Message 5 of 5 (208 Views)

Re: Why to specify a port number outside of the range 27000 through 27009 for lm

05-16-2012 10:37 AM in reply to: TravisNave

I agree, I think the only good thing to do is to at least update the FlexNet exe files once in a while.

Jimmy Bergmark
JTB World - Software development and consulting
Specialities: AutoCAD, AutoCAD Architecture and Revit
http://www.jtbworld.com

JTB FlexReport - network license reports
http://www.jtbworld.com/jtbflexreport/index.htm
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