What is the process which has to be followed in MCORE in case of certificate expiry ?

First deactivate the terminal and thereafter expiring certificate. Revised certificate shall be uploaded certificate. Path-- WIRE-->OPERATIONS -->MCORE-->Add connectivity-Certificate-Terminal-->Certificate option. After uploading the certificate, apply for terminal to re-activate terminal on re-validated certificate. This is the most common mistake made by BA, wherein they just upload the certificate & do not re-apply for terminal.