Jose Luis,
I have installed SA 3.3.1 with pyzor 0.5.0 on a server with CentOS 4.8, reviewing SA logs shows the following message: warn: pyzor: check failed: internal error, python traceback seen in response It should be noted that I recently updated to version 4.7 CentOS 4.8
Try opening the port that Pyzor requires in order to operate correctly. I used the command: iptables -A INPUT -p udp -m udp --dport 24441 -j ACCEPT
Hope that helps.