We are getting ORA-12505 (TNS:listener does not currently know of SID given in connect descriptor) only on BEA Weblogic connections! We are getting this error only once in a while and are not able to reproduce it via sqlplus/toad/other clients. Any suggestions? Environment: 3-node Oracle RAC (10.2.0.3.0 on Solaris 10 w/ASM). Thanks, Abdul