"Estream construct failed" Error on Solaris i86pc

Hi Guys,

From past some days, I am getting an error in /var/adm/messages which is as shown below.

XXXXX02:/# cat /var/adm/messages |tail 
Sep 16 15:28:14 XXXX02 EV_AGENT[2456]: [ID 881973 daemon.error] Agent Main --Estream construct failed. Err: EMULSocket::recv() 
Sep 16 15:31:49 XXXX02 EV_AGENT[2456]: [ID 558310 daemon.error] Agent main -- unknown exception 
Sep 16 15:32:23 XXXX02 EV_AGENT[2456]: [ID 881973 daemon.error] Agent Main --Estream construct failed. Err: EMULSocket::recv() 
Sep 16 15:35:49 XXXX02 EV_AGENT[2456]: [ID 558310 daemon.error] Agent main -- unknown exception 
XXXXX02:/# 

the hardware version is SunOS XXXXX02 5.10 Generic_144489-08 i86pc i386 i86pc.

Any help would be appreciated.

regards
Vivek

is external storage attached to this machine?

yes..