certificate issue

[Iphoneuser]

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

[Iphoneuser]

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

[Kubig]

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

[Iphoneuser]

yes
i checked that part