Thanks George.  I got it figured out.  Here is the
whos & hows:

> Can you explain in more detail what you're doing,

Compiled Nessus w/tcpwrappers
edited /etc/hosts.allow as follows:
nessusd:  /hostsallowed.txt:

> especially who's

Just multiple Nessus clients/users needing to run
scans.

> connecting and from where? 

All are Windows' clients on the same subnet as the
Nessus server.  All clients are using SSL certs.

>Also, is there anything
> in nessusd.messages
> that suggests what the problem is?

The only thing that shows in the nessusd.messages is,
as soon as user 1 disconnects, a connection attemp
from user 2 is recorded, _even though user 2 has
already cancelled the connection attempt. Like the
server is holding it in a buffer waiting for a free
connection.


Now, for the answer.  It seems Nessus' tcpwrappers
doesn't like the colon (":" (without the quotes))
after the client list in /etc/hosts.allow.  It doesn't
seem to matter whether or not I have any shell
commands after the colon.  I use it with certain
xinetd services and didn't expect it to be an issue.

Thanks for the help.

John B.

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