# Multicast

Don McGregor (mcgredo@azure.stl.nps.navy.mil)
Mon, 22 Jun 1998 15:36:58 -0700

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    Message-Id: <3.0.5.32.19980622153658.00a3f100@stl.nps.navy.mil>

    Date: Mon, 22 Jun 1998 15:36:58 -0700

    To: java-security@javasun.javasoft.com

    From: Don McGregor <mcgredo@azure.stl.nps.navy.mil>

    Subject: Multicast

I'm trying to get multicast working with the Java plugin, without much
success. When I try to do a joinGroup() I get a security exception thrown in
checkMulticast().

I've got the applet signed and in a jar file; I can open up unicast
datagram sockets and send to arbitrary machines, and can write to
files. But apparently the default level of security does not allow
multicast.

Can anyone point me to a source of information on how to modify the
security permissions/policy? Is this limited to JDK 1.2, or can you
do it in 1.1.x?

Don McGregor mcgredo@stl.nps.navy.mil http://www.stl.nps.navy.mil/~mcgredo
"One half of the world does not understand the pleasures of the other half."
--Jane Austen

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