Multicasting video on 3Com network

Troubleshooting video multicasting on a LAN with 3Com 4200G doing routing and the remainder of the switches on the network are 3Com 4500s.  The video system is Safari Montage.  
Safari people tell me that igmp-snooping and pim must both be enabled in order to multicast the video, but pim is not a feature of these switches.  3Com documentation indicates that if igmp-snooping is disabled, the video will be broadcast by default, but that does not work either.
The video encoder, video server and all wired LAN clients are on the same VLAN.  The encoder puts the H.264 video onto the LAN and can be configured to unicast or multicast.  The server provides a web interface to view the video using http.  The video feed from the encoder can and has been tested using QuickTime using rtsp, and that testing has proven that multicasting is working; at least, I can view the video from randomly selected PCs on the LAN so my impression is that multicasting is working.  Ideally, the users will open the web page to video the multicast, but right now my only option seems to be to use QuickTime.
Am not clear what other information I should provide in order to get help, so please ask any questions.  Sincerely appreciate any and all assistance.
BTW, the system used to work.  The network was reconfigured; VLANs were added.  There is a management VLAN1, VLAN100 (wired LAN clients) and VLAN101 (WLAN clients).  I do not have a backup of the switch configs from before the changes.
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wolf2008Asked:
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wolf2008Author Commented:
Determined that the problem was an outdated player on all client PCs. :|
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Gareth Tomlinson CISSPNetwork and Security ManagerCommented:
what device is routing between the VLANs? On Cisco kit you have problems with Multicast becasue the MAC address appears on multiple ports, and have to be either allowed using igmp snoop or manually assigned to a group of ports.
Routers have trouble with this, not switches, so I'd look at your layer 3 device.
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wolf2008Author Commented:
The 3Com 4200 is routing.  However, there is no need to route this multicast.  The source and all clients are on the same VLAN.  We are not trying to route to the WLAN.  I'm just trying to make it work on the one VLAN.
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Gareth Tomlinson CISSPNetwork and Security ManagerCommented:
Does it work in unicast mode?
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Gareth Tomlinson CISSPNetwork and Security ManagerCommented:
can you clarify, is igmp snopping disabled?
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wolf2008Author Commented:
IGMP-snooping is currently enabled.  The results of unicasting are the same.  Video can be viewed using VLC or QuickTime, but not thru the web interface of the Safari Montage server.
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Gareth Tomlinson CISSPNetwork and Security ManagerCommented:
Then it sounds to me as if your Multicasting is working, sorry. If the stream is accessible using other clients, there's got to be something amiss with the server.
It's not something mad (forgive me for asking) like a firewall policy on the server preventing HTTP?
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wolf2008Author Commented:
It was the solution
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