ERROR Unable to connect to Oracle ORA-00257

Hi,

We are getting this issue, suddenly end user can not login!

log:

3676/2460 MAIN_THREAD                        Mon Nov 30 01:38:42.342000 IPCMISC.C299
process 3676 <jdenet_k> registered in entry 8

3676/2460 MAIN_THREAD                        Mon Nov 30 01:38:42.420000 NETCFG.C297
Starting Kernel of Type:SECURITY KERNEL

3676/2460 MAIN_THREAD                        Mon Nov 30 01:38:42.420001 NETPUB.C3111
KERNEL RECYCLING: This kernel will start recycling at Sun Dec 06 03:30 (using time of day of Sun:03:30)

3676/2460 MAIN_THREAD                        Mon Nov 30 01:38:42.420002 NETPUB.C3163
KERNEL RECYCLING: Kernel PID (3676) will consider users inactive after 360 minutes (using inactive-user elapsed time of 6:00)

3676/2460 MAIN_THREAD                        Mon Nov 30 01:38:42.420003 NETPUB.C3201
KERNEL RECYCLING: Kernel PID (3676) will do a forced exit at Sun Dec 06 15:30 (using forced-exit elapsed time of 12:00)