unable to find valid certification path to requested target

1. Add certificate to cacerts with InstallCert.java or linux command line. Put it to %JAVA_HOME%\jre\lib\security\

2. Check or add usage correct -Djavax.net.ssl.trustStore="...\cacerts"

3. Check Network, Firewall and Proxy settings by accessing the site with:
      Try:

         ping host 

         ping ip

      Try:

         telnet hostname port