Sup II and MSFC talk via internal trunk 15/1
from supervisor prompt to access the MSFC
Hope to help
My be a silly question but are you running in native mode, ie IOS on the SP and RP and RP takes control.
What prompt do you have
Type show version at your current prompt and paste the first few lines in here
I am running in native mode. Here are the few lines from sh ver output
Cisco Internetwork Operating System Software
IOS (tm) s72033_rp Software (s72033_rp-ADVENTERPRISEK9_WAN-M), Version 12.2(18)SXF6, RELEASE SOFTWARE (fc1)
Technical Support: http://www.cisco.com/techsupport
Copyright (c) 1986-2006 by cisco Systems, Inc.
Compiled Mon 18-Sep-06 23:32 by tinhuang
Image text-base: 0x40101040, data-base: 0x42D90000
1, "show module" to check if MSFC is up and in OK status.
2, "show port 15/1" to make sure port 15/1 is not in err-disable status.
If both is OK, you might disable your vty session in your MSFC configuration. (Session 15 command will try to telnet to MSFC).
So you might have to use "switch console" command when you CONSOLE into the switch.
sh module results shows the MSFC status as OK.
Sh port 15/1 throws error.
I believe it throws error, as I am running in Native Mode (Cisco IOS)