Network Driver Cannot Open Network Device!!

Hi, In no particular pattern, i get this error, and the only way out is to reboot the server (and take downtime), which is not good. It could happen after several monhts, or several days. 16:56:11 NSF putlocal: t_open error: t_errno = 8, errno = 12. 16:56:11 listener-thread: err = -25574: oserr = 0: errstr = : Networkdriver cannot open the network device. I've googled qutie a bit for this, and it appears that this is not an uncommon error, but wasn't able to find specific solutions. The 25574 error number merely points to something bad going on in the OS/Network area and i am not able to find out what is it. Informix listens on 2055 and i don't have any other services listening on that port, started before or after ifmx startup. Upon the last reboot i increased the soft and hard file descriptor limits. This is a Solaris 7 box, Informix 7.31.UD4. I am pasting the /etc/system below, and can also supply the config files if needed - set enable_sm_wa = 1 set shmsys:shminfo_shmmax=268435456 set semsys:seminfo_semmap=64 set semsys:seminfo_semmni=4096 set semsys:seminfo_semmns=4096 set semsys:seminfo_semmnu=4096 set semsys:seminfo_semume=64 set semsys:seminfo_semmsl=100 set shmsys:shminfo_shmmin=100 set shmsys:shminfo_shmmni=100 set shmsys:shminfo_shmseg=100 #set hard limit on file descriptors set rlim_fd_max = 4096 #set soft limit on file descriptors set rlim_fd_cur = 1024 * vxvm_START (do not remove) forceload: drv/vxdmp forceload: drv/vxio forceload: drv/vxspec forceload: drv/sd forceload: drv/pci forceload: drv/ssd rootdev:/pseudo/vxio@0:0 set vxio:vol_rootdev_is_volume=1 * vxvm_END (do not remove) I really hope someone has an answer to this issue, or at least the most probable things to check/modify!!! Thanks, Anjan