Login issue in both Oracle EBS and database

My environment
EBS --> R12.0.6
Platform -> AIX
DB Node -> oracledb
APPS Node -> app1
Issues:
On DB Node:
when trying to open alert log file getting following error against command:
vi alert*
ksh: 0403-030 The fork function failed. Too many processes already exist.
when trying to get connection through sqlplus either from db-node or apps-node getting following error message:
ORA-12518 Tns: Listener could not hand off client conenction.
when trying to login application while accessing through URL http://hostname.domain:port getting either blank page or 500 Internal server error containing also message of
ORA-12518 Tns: Listener could not hand off client conenction
This is production server and users are not able to use the application. Please guide me to overcome the issue. Thanks in advance.
Regards,
M.U.N.A

Hi;
What is your maxuproc value? Please check below link:
http://www.computing.net/answers/unix/aix-problem-please-help/5468.html
http://www.computing.net/answers/unix/aix-problem-too-many-process/6681.html
Also be sure you have related prerquest for IAX
Oracle Applications Installation and Upgrade Notes Release 12 (12.0.4) for AIX-Based Systems [ID 402306.1]
For tns error check below notes:
ORA-12518 / TNS-12518 Troubleshooting [ID 556428.1]
R12 Concurrent Managers Not Starting After Patching or Upgrade Changes [ID 811093.1] << also check referance part
Regard
Helios

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user11992646 wrote:
Here we have something like "firewall rules". When we want internet users to access an external website without entering web proxy userid/pswd(the same I used for set_authentication), our web team establishes a rule or an exception like ...such and such website can be accessed without entering proxy userid/pswd information. A firewall does not use user authentication - in other words, when a web browser traffic goes via a firewall, the firewall will not ask the web browser for credentials and the web browser will not popup a username & password box.
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Not an Oracle issue.. but simply one of network connectivity between the server platform running Oracle and the remote web sites that need to be accessed.

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