well if you do not post any error, then we can not help
also 5.8 is a bit out of date
the current in the legacy 5 series in 5.11
you really do need to upgrade ASAP
seeing as RHEL is a commercial product and you do need the required support contract
have you contacted redhat tech support
you are paying redhat in upwards of a few thousands dollars per year , you might want to use that support .
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