OS Identification (Plugin 11936)

Hi all, per this blog:

  http://blog.tenablesecurity.com/nessus/page/3/ (search down the page
    for 11936)

The listed plugins are used to determine the identify of the OS on the
target host.  I don't see output of telnet listed there -- would this
be ignored as a factor in determining the OS?  In other words:

$ telnet hostname
Trying 10.27.52.76...
Connected to hostname.
Escape character is '^]'.
Red Hat Enterprise Linux Server release 5.2 (Tikanga)
Kernel 2.6.18-92.1.6.el5 on an x86_64
login: 
telnet> quit

It seems that this could be used with a high degree of confidence in
determining that this machine is a RHEL 5.2 machine :)  Instead, with
the above host and 11936 enabled, I get only a 30% chance that the
machine is running the "Linux kernel".

Anyone know on the telnet thing?

Thanks,
Ray
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