Not able to login Designer

Hi

I am facing the below error while loging to Designer.

[repo_proxy 13] SessionFacade::openSessionLogon with user info has failed(Unable to log on: Could not connect to server

lexbod.c-a-m.com. Please check that the server name is correct, and that the server is running.

(hr=#0x80042a01)

I referred many forum threads but didn't get any solution.

1. I am using SAP authentication as it is integration project.

2. Kept server name at hosts file.

3. Able to login using Infoview

4. Able to login using QaaWS client

5. I am connecting to BO using client VPN.

6. People who are there direclty on client network are able to login designer.

Please share your thoughts.

Thank you

Praveen