Problem in opening IR & ID using VPN connection

We are using VPN connection for our XI server, but when we are trying to open the IR or ID we are getting error as below

An error occurred while launching/running the application.

Title: Integration Builder

Vendor: SAP AG

Category: Download Error

Corrupted JAR file at http://budasxidlnx.emea.consind.ge.com:50000/rep/repository/aii_ibrep_client.jar

so help me on solving this.

Thanks,

Rajeshwar