Can't Connect to Discoverer: Error Message

I came into work this morning and found the users cannot connect to Discoverer. I can't either. I was hoping to possibly get some help here. Has anyone received the error message I am about to post? I would be very grateful for any help! Here is the error message in full:
Error
An error occurred while creating the session. Please check for other errors.
- oracle.discoiv.connections.ConnectionStoreException: Unable to establish secure connection to Oracle Internet Directory Server ldap://orasrv2:636/ Base Exception : javax.naming.CommunicationException: orasrv2:636 [Root exception is java.net.ConnectException: Connection refused: connect]
- Unable to establish secure connection to Oracle Internet Directory Server ldap://orasrv2:636/ Base Exception : javax.naming.CommunicationException: orasrv2:636 [Root exception is java.net.ConnectException: Connection refused: connect]
- Unable to establish secure connection to Oracle Internet Directory Server ldap://orasrv2:636/ Base Exception : javax.naming.CommunicationException: orasrv2:636 [Root exception is java.net.ConnectException: Connection refused: connect]
Unable to retrieve connection list
- The connection list could not be retrieved. See other error messages for details.

Ok, the fire has been put out. Our dba just rebooted the server Disco was running on and it seemed to fix the problem. We still don't know why it happened, so if anyone recognizes that error, I wouldn't mind a heads-up on why it occured in the 1st place if you know.
Thanks!

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