cannot receive full plugin feed despite registration

Can someone give me some hints to what I am doing wrong here.

I've downloaded the nessus-installer-2.2.3.sh, installed it, and 
provided the activation code when it asked for it, all without error 
messages (apparently it knows how to find the http_proxy environment 
variable).
After the installation, because I'm on an internal LAN, with a http 
proxy and with a firewall,  I've created a 
/usr/local/etc/nessus/nessus-fetch.rc
with :
   proxy=myproxy.internaldomain.com
   proxy_port=8080

Now when I start the nessusd for the first time, or run 
nessus-update-plugins I get:
======
   # nessusd -D -a 127.0.0.1
   Loading the plugins... 2652 (out of 6330)
   You are running a version of Nessus which is not configured to 
receive a full plugin feed. As a result, your security audits might     
   produce incomplete results. To obtain a full plugin feed, you need 
to register your Nessus scanner at the following URL :
                  http://www.nessus.org/register/
======
I've done the registration as part of the installation, and got no error 
messages, so what I am missing here.

I've also had a look at the nessus-fetch options (with a configured 
nessus-fetch.rc):
This one works:
       # nessus-fetch --url http://www.nessus.org/index.php test.txt
The test.txt contains the requested URL.
This does not work:
       # nessus-fetch --check
       nessus-fetch is not configured to receive a direct plugin feed
This gives me contradicting output:
       # nessus-fetch --register {my activation code}
       could not connect to plugins.nessus.org - Success

I've also tried with a 2nd new registration code entering this manually 
and then entering the 3 location lines that came with the 2nd 
registration in usr/local/sbin/nessus-update-plugins (note that it did 
not contain the mentioned "old" three lines):
location="http://www.nessus.org/nasl/all-2.0.tar.gz";
location_md5="http://www.nessus.org/nasl/all-2.0.tar.gz.md5";
location_sig="http://www.nessus.org/nasl/all-2.0.sig";

Because this still gave me the same error messages I've also did a 
complete uninstall-nessus with all settings, and reinstalled everything 
and started over again, with new activation codes.


A second machine I tried nessus on works just fine, this machine is not 
on the Internal LAN but connected directly to the Internet, It does not 
complain about registration when running nessusd or 
nessus-updated-plugins, and it has 7000+ plugins.

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