RARELY - *ERROR* JdeConnectionPool SR****3:6016 Error creating input or output stream for socket: C

expert,

log:

18 Jul 2013 10:12:38,810 [SEVERE]  - [NET]             *ERROR* JdeConnectionPool SR****3:6016 Error creating input or output stream for socket: Connection timed out
18 Jul 2013 10:12:59,872 [SEVERE]  - [NET]             *ERROR* JdeConnectionPool SR****3:6016 Error creating input or output stream for socket: Connection timed out
18 Jul 2013 10:12:59,876 [SEVERE]  - [JAS]             Could not reach security server <SR****3>, Error creating input or output stream for socket: Connection timed out
18 Jul 2013 10:12:59,877 [SEVERE]  - [JAS]             Attempts to all security server failed. [STD] null
18 Jul 2013 10:12:59,877 [SEVERE]  - [JAS]             Exception occured in the JDESignon.loadUserProfileWithPass():Error occured  while loading the UserProfile for the User :JDE com.jdedwards.system.security.SecurityServerException: FAILURE: null

Error creating input or output stream for socket:???