It seems that CS-MARS is currently using RDEP protocol to perform the Test Connectivity function to Cisco IDS/IPS devices. Starting in IPS v6.1 RDEP is now disabled by default (it was replaced with SDEE starting in IDS 5.0/IPS 5.1). The reason the functionality of it still worked is that CS-MARS uses SDEE to pull data not RDEP.
The CS-MARS BU has flag this issue and said the fix for it will be released in 6.0.1. As a work around you can just ignore the Test Connectivity button or simply enable RDEP. To enable RDEP do the following:
sensor# conf t
sensor(config)# service web-server
sensor(config-web)# configurable-service rdep-event-server
sensor(config-web-con)# enabled true
sensor(config-web-con)# exit
sensor(config-web)# exit Apply Changes?[yes]: yes
Warning: The RDEP event server is deprecated, but functional. Please migrate to SDEE as support for the event server will be removed in a future release.
sensor(config)# exit
sensor#
http://blog.crimsonsilo.com/2008/05/cs-mars-ips-61-bug-explaination/
RDEP
SDEE
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