When using ZAP as a proxy and with HTTPs protocol, the web browser is displaying a java.security.cert.CertificateException: Certificates does not conform to algorithm constraints.
I am not yet sure why but there is a workaround as explained here: http://www.richardnichols.net/2012/0...m-constraints/
Basically edit your /usr/lib/jvm/java-7-openjdk-<arch>/jre/lib/security/java.security and comment out the line jdk.certpath.disabledAlgorithms=MD2