Current certificate is an intermediate certificate which is the cause of getting the error "Unable to get local issuer certificate. <20>" Fix advise by parallels is https://kb.parallels.com/en/122996 (put the Intermediate CA information in the domain certificate and use that certificate) or use a certificate from a reputed Root CA as all supported Root CAs are listed in the trusted.pem files available on Client Installations. I tried the steps advise in first method i.e. put the Intermediate CA information in the domain certificate and use that certificate. Steps I followed are below; Connected to PDC certlm.msc -> Opened Personal Certificates store of local computers I found the Domain certificate (Note: This Domain certificate was issued by a private CA of ADCS service) used (The private key of this certificate is in non exportable format) Exported this Domain certificate in X.509 (.CER) format Exported Intermediate certificate in X.509 (.CER) format Opened Intermediate Certificate in notepad copied CA information and add in the domain certificate in -----BEGIN CERTIFICATE----- -----END CERTIFICATE----- -----BEGIN CERTIFICATE----- -----END CERTIFICATE----- To get the private key in our 2X ClientSecureGateway I requested for a new certificate to same ADCS CA which issues Domain certificate. Exported private key and its certificate in pfx format But I don't know what I missed I am keep getting error private key does not match with certificate. Kindly remote in and fix this issue.