Problem

Error on CFT side:

CFTH13E FPDU Remote reject <PART=My_ConnectExpress_partner DIAGI=730 DIAGP=ABO 300>

Error on Connect:Express side: code 730 ABO 311

ABORT -> YVAL3280 SRC=0001 TRC=0000L PRC=3300

Resolution

Check the CFT parameters so PROF CFT is not used when in front a C:X partner
Check the partner properties so PeSIT E is used.

PROF = ANY must be used when the partner is Connect Express

On C:X side, check the session table/partner properties and verify the PeSIT version E is used