Another Snow Leopard issue; Juniper’s Network Connect application (from the great Secure Access series) wouldn’t work anymore. It started, but when connecting, it gave the very descriptive error: “Cannot connect!”
Hidden away in the Juniper forums I found the solution:
sudo chmod 755 /usr/local/juniper/nc/6.4.0/
sudo mkdir '/Applications/Network Connect.app/Contents/Frameworks'
6.4.0 being your local version.