Multiple Oracle Linux systems simultaneously experience login issues, connectivity loss, performance degradation due to centralised syslog server unavailability

(Doc ID 2328992.1)

Last updated on NOVEMBER 15, 2017

Applies to:

Linux OS - Version Oracle Linux 5.0 and later
Linux x86-64
Linux x86

Symptoms

Users are suddenly unable to login to one or more Oracle Linux servers - whether bare metal or Oracle VM guest Virtual Machines (VMs).
In some cases, users can login to some systems, however, overall system performance and connectivity is severely degraded.
In other instances, attempts to login to systems e.g. via SSH fails completely.
The issue affects multiple Oracle Linux systems and the issue started at almost exactly the same time across all affected systems.
All affected systems are configured to send system logging to a remote centralised syslog server.
A review of affected systems' syslogs on the central syslog server identifies no relevant entries, however, the timestamp of the very last entry for each system is almost identical.

Changes

All affected Oracle Linux systems are configured to send syslog entries to a remote, centralised syslog server.
The centralised syslog server had recently become unavailable.

Cause

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