Destination from S/4HANA to Ariba CIG - Direct connection to testacig.ariba.com refused

Hi,

While sending SAP Information from S/4HANA to Ariba CIG, we are getting the below error messages.

SRT: Processing error in Internet Communication Framework: ("Direct connect to testacig.ariba.com:443 failed: NIECONN_REFUSED(-10)")

In SM59 also, it is showing as connection refused.

Direct connect to testacig.ariba.com:443 failed: NIECONN_REFUSED(-10)"

Thanks