We are running on NW04s EP7 SP09 and are intermittently getting this error message:
Error while sending HTTP data. Status: 401. Message: Unauthorized. Please check if the target SLD system is available and the SLD bridge is started there.
User Guest, IP address
HTTP request processing failed. HTTP error  will be returned. The error is [Authentication did not succeed.No details available].
which results in the error : Error while obtaining JCo connection....
The temporary fix is to unlock the "SLDDSUSER" account on the SLD server. I am not sure why this account gets locked?