Problems with install an XMPP ejabberd server with ubuntu 18.04

[R. A.F.]

Hello,

I'm trying install an XMPP ejabberd server with ubuntu 18.04 and I've
problems with it. Everything seems to be ok, but when I try enter inside
the admin configuration in FireFox don't work.

Could you help me to resolve or to find the error?

Thanks
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