Ediscovery Query succeeded, However whenever you try to export it as PST you may encounter below error:


Application download did not succeed. Check your network connection, or contact system administrator or network service provider.

Click on details for more details, You may see:

Activation of

https://localhost/ecp/15.0.1178.4/exporttool/EXC002.LOCAL/microsoft.exchange.ediscovery.exporttool.application?name=KIngson1&ews=https%3A%2F%2Flocalhost%2Fews%2FExchange.asmx resulted in exception. Following failure messages were detected:
+ Downloading https://localhost/ecp/15.0.1178.4/exporttool/EXC002.LOCAL/microsoft.exchange.ediscovery.exporttool.application?name=KIngson1&ews=https://localhost/ews/Exchange.asmx did not succeed.
+ The underlying connection was closed: Could not establish trust relationship for the SSL/TLS secure channel.
+ The remote certificate is invalid according to the validation procedure.

As you see here, The remote certificate is invalid because the URL used which is localhost doesn’t have certificate.




  1. Just click on Certificate error in browser
  2. View Certificates
  3. Issued by is the actual FQDN to be used

In my case it is EXCAS01, So I changed the URL from https://localhost/ecp to https://EXCAS01/ecp

Now you can download PST without any issues.


By Kingson Jebaraj

Microsoft MVP, Blogger, Owner and Publisher for Cloudexchangers.com, Microsoft TechNet Author, Solution Architect, Former Office365 Technical Lead for Microsoft(Partner) Extensive knowledge and experience in Microsoft Exchange and Cloud Messaging Services and has got more exposure on Messaging environment deployment,migration,designing and other project management activities, I have earned real time experience in handling multi-site distributed critical large environment of messaging system. Been awarded as an MVP (Microsoft Most Valuable Professional) for Office Servers and services from Microsoft for an exceptional real world contribution made through Microsoft forums and other Microsoft communities. Currently working as “Solution Architect” on Private/Public cloud and SaaS environment for Pacific Controls, UAE, Dubai. One of the largest TIER III certified green data center campus in the middle east.