certificate issue

Hey folks, I have installed the certificate for emailserver java to communicate with mail boxes. for some reason its not working
certificate has been expired and we are uploading a new one
this are the steps i followed

  1. get the certificate
  2. Using keytool generate truststore file
  3. upload truststore file into host where email server is residing
  4. stop and start the emailserver

Am i missing anything?
took help from certificate guys and did the same process couple of times
any suggestion

error message from logs
javax.net.ssl.SSLHandshakeException: sun.security.validator.ValidatorException: PKIX path validation failed: java.security.cert.CertPathValidatorException: timestamp check failed

Did you check if the cert is in keystore “location” where the ESJ point out in his startup script?

yes
i checked that part