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The FWSM does not allow multicast IP traffic to pass through the device
This issue occurs in lower versions of the Cisco Firewall Service Modules (FWSM).
The FWSM 3.1.1 is the first version to support multicast traffic. The FWSM supports both stub multicast routing and Protocol Independent Multicast (PIM) routing. However, it is not advisible to configure both concurrently on a single FWSM.
The FWSM can also be configured as a member of a multicast group. When the FWSM is configured to join a multicast group, upstream routers maintain multicast routing table information for that group, and keep the paths active for that group.
Note: When multicast routing is enabled, PIM and Internet Group Management Protocol (IGMP) are enabled on all interfaces by default. Also, multicast routing is not supported with multicontext in FWSM 2.3.