Can a CISCO(or anyother) network device can block DCOM/RPC/WMI?

Hi, I have an environment where I want WMI(which uses DCOM/RPC) to work between two computers. Now, I have followed all the WMI/DCOM settings and permission on the PCs, but still when I tried to connect (using wbemtest), it always errors with "Access is denied". What I know about the environment was there are vlan configurations to control network access. But I knew that telnet to port 135, 445 succeeds, but its just WMI erroring out. Is there any configuration that can be done in VLAN to make it behave like the following:

1) Ports(including 135 and 445) are open and access is allowed 2) But block WMI protocol by throwing "Access is denied"

Thanks

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z80pio
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