Access the secure web service from crystal report

We have a web service server, all the web service on this server needs the certificate.

I use the crystal report designer to design a report which use the web service as datasource. I configed the certificate as the following steps:

1. download the certificate and export it as the .cer file

2. use the keytool import the cer file to the JRE cacerts file

Then I can use the web service in the design tool.

I have another server which the crystal report server running. I did the same thing for the crystal report server and upload the report file to the crystal report server. But I can not access the web service when I tried to view the report server in the crystal report server console.

Is there anybody can help about this, thanks.