The server logs are on the mid-tier under a path similar to /sso/biconfig/940/Lev1/Web/WebAppServer
The task logs are within the federated area and easiest accessed via the IRM UI - just right-click on the node for which you want to get the log.
The SAS Users Group for Administrators (SUGA) is open to all SAS administrators and architects who install, update, manage or maintain a SAS deployment.