Problem:

When connect to an 11i E-Business Suite database using SQL Developer, the following error appears:

An error was encountered performing the requested operation:

IO Error: Connection reset

Vendor code 17002

Sometimes, the error reads:

An error was encountered performing the requested operation:

IO Error: Got minus one from a read call

Vendor code 17002

Issuing the tnsping command against the instance returns the following:

C:>tnsping vis3

TNS Ping Utility for 32-bit Windows: Version 9.0.1.4.1 - Production on 02-MAY-2012 10:21:29

Copyright (c) 1997 Oracle Corporation.  All rights reserved.

Used parameter files:
C:OracleDevSuiteHomenetworkadminsqlnet.ora

Used TNSNAMES adapter to resolve the alias
Attempting to contact (DESCRIPTION= (ADDRESS=(PROTOCOL=tcp)(HOST=oel5vis3.localdomain)
(PORT=1524)) (CONNECT_DATA= (SID=VIS3)))
TNS-12537: TNS:connection closed

Pinging the instance on the database node completed successfully.

The problem started occurring after applying ATG RUP7.

Solution:

AutConfig was run as part of applying ATG RUP 7 patches. This regenerated the sqlnet.ora, which included the following two lines:

tcp.validnode_checking = yes
tcp.invited_nodes=(OEL5VIS3.localdomain)

This blocked all SQL connections to the server. Since this instance is a test environment, the above lines in sqlnet.ora were commented off and the listener bounced.

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