Request not sent to uri=... org.apache.commons.httpclient.HttpException: No issuer certificate found for Sectigo RSA Organization Validation Secure Server CAIssue The customer is experiencing an issue while using REST API to send a message. The error message displayed is: Request not sent to uri=... org.apache.commons.httpclient.HttpException: No issuer certificate found for Sectigo RSA Organization Validation Secure Server CA: No issuer certificate found for Sectigo RSA Organization Validation Secure Server CA. Facts➤ Perform an SSL server test using the following link by entering the hostname:https://www.ssllabs.com/ssltest/index.html ➤ The test results show the following message: ```Chain issues detected. Possible reasons are missing intermediate certificate or wrong order of the certificates.1. Subject CN: *.sapb2b.mt.com > Issuer CN: Sectigo RSA Organization Validation Secure Server CA2. Subject CN: Sectigo RSA Organization Validation Secure Server CA > Issuer CN: USERTrust RSA Certification Authority3. Subject CN: Sectigo Public Server Authentication CA OV R36 > Issuer CN: Sectigo Public Server Authentication Root R46``` ➤ Additionally, you can use the following tool by pasting your certificate and check for any errors: https://tools.keycdn.com/sslReleaseNot release specificResolution To solve above Error message follow below: 1. Ensure the full certificate chain is present in the correct order. 2. Reach out to the endpoint host team to correct the order of the certificate chain, as they will know the correct order of the full certificate chain.