Branch Office - Mobile Server connection problem

Branch Office is successfully installed on a XP-PC inclusive the services are started, Mobile -Server is installed on a remote Server. After login with user and password in http://localhost/webtogo/ "Branch Office Web" it takes a while (we think in case of synchronization) but then we get the message at the left side of the browser "javax.servlet.ServletException: Could not get Automatic Sync Status"
We think its a problem of the connection to the Mobile-Server but we have no Idea, how we can solve this problem because we can't verify the problem. There is no firewall and no restriction in our network.
We hope that anybody has an idea!

BTW. How may concurrent user can be support by Oracle9iLite?

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    Some mail providers also make you login to retrieve mail before you can send, too, so make sure that it is just not an operational issue of you trying to send mail before retrieving new mail, should they be operating that way.
    Just out of curiosity, what happens in Terminal when you type
    telnet {hostNameOfYourOutboundMailServer} {portNumberOfYourOutboundMailServer}?
    Do you see something like :
    Connected to {hostNameOfYourOutboundMailServer}.
    Escape character is '^]'.
    220 {hostNameOfYourOutboundMailServer} ESMTP Postfix
    (you can type quit or just <control>-C to bail out of this)
    (if this solves your problem, or is actually helpful towards arriving at a solution to your problem, please consider marking this reply as "helpful" or "solved," in addition to, if applicable, marking this question as "answered")

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