sam995972 wrote:The most common cause for TNS-12535 is due to Firewall on or between client & DB Server.
Database version: Oracle10g R2 (10.2.0.5)
We are connecting to Oracle DB through LDAP, by that time facing below error.
Error occurred : TNS-12535: TNS Operation timed out
ORA-12170: Connect Timeout Occurred.
we are using oracle 10g (10.2.0.1) client.
is it client bug?