Authentication on single sign on page slow and hangs.

Hi members
We are using Oracle application server single signon with Apex as partner application. The single sign on page authentication was working properly until yesterday when all of a sudden it became very slow. After the username and password are entered and login button is pressed, the blue status bar is moving extremely slow finally leading to a page not found. Can someone advise what components (logfiles etc) need to be checked to resolve this?
Thank you.
Ravi.

Hi,
I tried to find the cause but I have no clue yet as to what is wrong with this slowness of single sign on page. Can someone throw some light on this and tell what could be wrong here? Thank you. There are some errors in the HTTP Server Virtual Host log file and the log file is creates when oc4j_security was restarted. In the documentation, they were described as not uncommon. I am doubting if that is the reason behind the slowness. Thanks in advance.
Wed May 27 11:46:09 2009] [error] [client 198.222.232.234] [ecid:
1243439169:198.222.232.234:476:3948:151,0] File does not exist:
d:/oracle/oracleas/apache/apache/htdocs/favicon.ico
[Wed May 27 14:54:15 2009] [error] [client 198.222.232.234] [ecid:
1243450455:198.222.232.234:476:4028:185,0] MOD_OC4J_0015: recv() returns
0. There has no message available to be received and oc4j has gracefully (orderly)
closed the connection.
[Wed May 27 14:54:15 2009] [error] [client 198.222.232.234] [ecid: 1243450455:198.222.232.234:476:4028:185,0] MOD_OC4J_0054:
Failed to call
network routine to receive an ajp13 message from oc4j.
[Wed May 27 14:54:15 2009] [error] [client 198.222.232.234] [ecid:
1243450455:198.222.232.234:476:4028:185,0] MOD_OC4J_0033: Failed to receive
an ajp13 message from oc4j.
[Wed May 27 14:54:15 2009] [warn] [client 198.222.232.234] [ecid: 1243450455:198.222.232.234:476:4028:185,0] MOD_OC4J_0078:
Network connection
errors happened to host: test02 and port: 12501 while receiving the first response from oc4j. This request is recoverable.
[Wed May 27 15:13:19 2009] [notice] FastCGI: process manager initialized
(End of Log File)

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