Please Help, Ifound this error

[mo3az4islam]

Salam alikom
I have a middlewar that connect to oracle DB,
It was works very well, but I noticed that an error appear in some times but not always, this error is
IO exception: Network adapter couldn't establish connection
I try to change the host name from the IP of the sever to this word "Localhost"
but this problem didn't solved
I try also to see the listener.ora file & add the trace statement but no change
the problem solved only when I resarted the server, but this is not good solution
so please, are there any one who can guide me to solve this problem
I'll be very thankfull for you
Moaaz

[ابو صالح]

ماهو رقم الخطأ؟