Fatal NI Connect Error 12537 With TNS-00507: Connection Closed
(Doc ID 2835925.1)
Last updated on MAY 17, 2023
Applies to:Oracle Database - Enterprise Edition - Version 18.104.22.168.0 and later
Information in this document applies to any platform.
Intermittently disconnections to production DB from Client, on logs are reported:
Fatal NI connect error 12537
nt main err code: 507
This behaviour started after Exadata patch rom 22.214.171.124.0.200713.1 -> 126.96.36.199.0.210909
client is 10.6.8.149
Affected clients is using on tnsnames.ora parameter connect_timeout in the tns entries
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