Hello DBA's Good Evening!! Hope every one is doing great!! Its 10g on solaris. We are getting this error when the Application team try to process data through ETL. But I did not find any errors related to this in the alert log. Has any one also faced this type. Is there any solution to resolve this issue. DPSTN_LTGTN,0: connect failed for env: null, user: , password: ***** Oracle error: -12549 ORA-12549: TNS:operating system resource quota exceeded Is this an error related to the OS issue.? or can we resolve this by resizing the memory? Please advise. Your help will be highly appreciated. Thanks Nilesh