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Spirent TestCenter: Spirent closing DUT connection with RST after 3-way handshake

While testing ISIS-SR, We have run into seemingly some interaction between ISIS-SR and BGP configurations.
Once we add ISIS-SR capability and prefix SID to configuration, BGP connections no longer establish.
We are not announcing any segment routing capability nor prefix SID On ports 1/3 and 1/4.

On ports 1/1 and 1/2, ISIS and BGP all work fine.
On ports 1/3 and 1/4, ISIS works fine (I see the correct capabilities, and I see the prefix SID). However, when my DUT reaches out to the Spirent, the Spirent sends back a RST right after the 3-way handshake.

Version 4.66
CR#01149870 Issue fixed in 4.67

Product : Windows GUI