I recently installed Nessus 3.2.0 in Backtrack 3. Here are the steps necessary to get it working. Most are identical to the 3.0.6 install guide at:
http://backtrack.offensive-security....Install_Nessus

Download the Fedora Core 8 RPM's from:
http://www.nessus.org/download/index...=nessus3-linux
Nessus-3.2.0-fc8.i386.rpm
NessusClient-3.2.0-fc8.i386.rpm

Convert to TGZ :
Code:
 
rpm2tgz Nessus-3.2.0-fc8.i386.rpm
rpm2tgz NessusClient-3.2.0-fc8.i386.rpm
Use the Slackware Package Tool to extract:
Code:
 pkgtool
Install packages from the current directory
Choose both Nessus-3.2.0-fc8.i386.tgz and NessusClient-3.2.0-fc8.i386.tgz

Now, configure the application:
Code:
cd /opt/
export PATH=$PATH:/opt/nessus/sbin:/opt/nessus/bin:
cp /usr/lib/libssl.so /lib
cp /usr/lib/libcrypto.so /lib

cp /opt/nessus/lib/libnessus.so.3 /lib
cp /opt/nessus/lib/libnessusrx.so.0 /lib
cp /opt/nessus/lib/libpcap-nessus.so.3 /lib

cd /lib
ln libssl.so libssl.so.6
ln libcrypto.so libcrypto.so.6

nano /etc/ld.so.conf
/opt/nessus/lib         #add this line to the config file
ldconfig

/opt/nessus/sbin/nessus-mkcert
/opt/nessus/sbin/nessus-adduser
This should get Nessus installed. Now, update your plugins. Make use you registered at the Nessus website. Use the code they emailed to you below.
Code:
 
cd /opt/nessus/etc/nessus
nessus-fetch --register XXX-YYY-ZZZ-VVV
Run the Nessus Server:
Code:
 /opt/nessus/sbin/nessusd
Launch the Client:
Code:
 /opt/nessus/bin/NessusClient
If you find any problems with the above tutorial, let me know so I can edit it. Thanks.

William