Open Enterprise Server 2015 SP1 (OES2015.1) and earlier
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Newer versions of Chrome require a TLSv1.2 connection for SSL, OES2015.1 and earlier are unable to provide this version of TLS. These products are considered End-of-Life and this functionality will not be added.
Upgrade to supported version of OES such as Open Enterprise Server 2018 SP2 or SP3 (OES2018SP2 or OES2018SP3)