Message CPI0999 Storage directory threshold reached

Hi all

From some days we receive the "Message CPI0999 Storage directory threshold

reached " in the qsysopr msqg; i checked with WRKDSKSTS command to find the
disk space usage, but they are at about 75% .. so in don't understand why
this message. I have also noticed that often, before of the CPI0999 message
, in the qsysopr msqg i see the message

Message ID . . . . . . : TCP2617 Severity . . . . . . . : 20

Message type . . . . . : Diagnostic

Date sent . . . . . . : 09/29/03 Time sent . . . . . . : 15:07:18

Message . . . . : TCP/IP connection to remote system 172.20.1.81 closed,
reason code 1.

to a remote Ip address, that i don't know and this remote ip address change
from time to time ..

Doe's anyone can suggest which could be the problem ?

How could find who run TCP connection that end with TCP2617 ?

Thanks in advance