Oracle Message PGA-20995 - communication error: string failed, rc = number, errno = number

ERRORcommunication error: string failed, rc = number, errno = number
CAUSEAn unexpected communications error occurred while executing the AIX SNA Server API function. The function return code is and the system error number is . The AIX SNA Server LU6.2 API function return codes and system error numbers are described in the vendor documentation. The SNA system error numbers can also be found in the /usr/include/luxsna.h header file on AIX systems.
ACTIONDetermine the cause of the communications error, correct it, and rerun the transaction. If you need assistance, contact your system adminstrator.