If your TeamForge server uses https and a self-signed SSL certificate, you may get a Java error while connecting to TeamForge. To resolve this, you need to import the server certificate into the keystore of the JVM running the CCF Master.
On Linux:
$ export PATH=$JAVA_HOME/bin:$PATH
$ sudo keytool -import -trustcacerts -alias <server> -file <server>.cer -keystore $JAVA_HOME/jre/lib/security/cacerts
keytool -import -trustcacerts -alias <server> -file <server>.cer -keystore %JAVA_HOME%/jre/lib/security/cacerts
You should be able to connect to the TeamForge site.