Uanble to connect to Business Studio Server. ... Error Code: 7401.

Hello everyone. I hope someone here can help me with this.
We are moving our Vendor Suite (V. 5.12) to another server.
We've transferred the SRMServer database to the new server and we've installed the Vendor Suite.
After the log in I got the error message "Uanble to connect to Business Studio Server. ... Error Code: 7401.".
What we should do now?