Create a job that uses CVS.
Set the CVSRoot to ":sspi:cvs@cvsserver:/SomeProduct" and execute the build.

Following trace appears on the build output:
Started by user Frank Kaaijk
Building in workspace D:\Jenkins\workspace\Some Product
FATAL: Unrecognized CVS Root: :sspi:cvs@cvsserver:/SomeProduct
java.lang.IllegalArgumentException: Unrecognized CVS Root: :sspi:cvs@cvsserver:/Some Product
at org.netbeans.lib.cvsclient.connection.ConnectionFactory.getConnection(ConnectionFactory.java:121)
at hudson.scm.AbstractCvs.getCvsClient(AbstractCvs.java:364)
at hudson.scm.AbstractCvs.getCvsClient(AbstractCvs.java:341)
at hudson.scm.AbstractCvs.perform(AbstractCvs.java:241)
at hudson.scm.AbstractCvs.checkout(AbstractCvs.java:211)
at hudson.scm.CVSSCM.checkout(CVSSCM.java:346)
at hudson.model.AbstractProject.checkout(AbstractProject.java:1251)
at hudson.model.AbstractBuild$AbstractBuildExecution.defaultCheckout(AbstractBuild.java:605)
at jenkins.scm.SCMCheckoutStrategy.checkout(SCMCheckoutStrategy.java:88)
at hudson.model.AbstractBuild$AbstractBuildExecution.run(AbstractBuild.java:514)
at hudson.model.Run.execute(Run.java:1703)
at hudson.matrix.MatrixBuild.run(MatrixBuild.java:304)
at hudson.model.ResourceController.execute(ResourceController.java:88)
at hudson.model.Executor.run(Executor.java:231)
at hudson.model.OneOffExecutor.run(OneOffExecutor.java:43)

This problem disappears when I downgrade to version 1.6.