Dodgy causes of ORA-12549?
This is a resource issue.

The DB server cannot satisfy your queries due to the client host being configured incorrectly as-per the pre-requisites for an Oracle database client installation. 

Ask your system administrators to verify that they have set the required number of open files, semaphores, shmax etc etc. Link to the Oracle documentation - I assume Linux, but Solaris docs are a link away from that.