Errors "Access violation at address 61DCE86B in module 'OraClient10.Dll'" and ORA-12592 (4310444)

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Errors "Access violation at address 61DCE86B in module 'OraClient10.Dll'" and ORA-12592
Description

The following errors are occurring frequently within Toad.
Access violation at address 61DCE86B in module 'OraClient10.Dll'. Write of address 00000000
ORA-12592: TNS:bad packet
ORA-12569 TNS:packet checksum failure
ORA-03106: fatal two-task communication protocol error"
Cause

Using 10.2.0.1 Oracle Client to connect to 11.2.0.4 database
Resolution

Upgrade Oracle Client to most closely match the database version. Per one user report, upgrading to Oracle Client 11g R2 (from 10g) resolved the "Access violation at address 61DCE86B in module 'OraClient10.Dll'. Write of address 00000000" error.

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