can't login to Tempo Box

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Hello ,
we are installing tempo box but when i enter the right username/password combination on the tempo box login page it just refresh the page and i don't get any message . In the Content service log it says " 2019-01-23 13:52:52.680 WARN com.opentext.otsync.content.ws.server.ClientTypeSet - Client reported an unknown type:"
P.S: I am using the full FQDN in the content service .

any help is much appreciated .