All 30 minutes my Macs (iMac/Snow Leopard, MacMini/Lion) are loosing the connection to the Windows Servers (2 Networks: Home with Home Server 2011 (Server 2008) and Office with Home Server V1 (Server 2003)).

Hallo,
Ich betreibe im Büro und zu Hause jeweils einen Microsoft Home Server. In beiden Netzwerken ist neben diversen Windows Rechnern auch ein Mac vorhanden.
Die jeweilige "Konfiguration" ist wie folgt:
- Apple MacMini (Late 2011, als HTPC) mit Lion per Wlan über AVM Fritzbox 7390 an Microsoft Windows Home Server 2011 (Windows Server 2008).
- Apple iMac (Late 2010, Arbeitsplatzrechner) mit Snow Leopard per Lan über AVM Fritzbox 7270 an Microsoft Windows Home Server V1 (Windows Server 2003)
Alle Betriebssysteme sind auf aktuellem Stand.
Die Fritzboxen laufen mit der jeweils aktuellen Firmware
Nun zu dem Problem:
Beide Macs unterbrechen ca. alle 30 min den Kontakt zum Server. Die Verbindung wird zwar ca. 1-2 Minute später wieder aufgebaut, aber am MacMini (HTPC) macht sich dadurch bemerkbar, daß der Film oder die Musik für obige Zeitspanne stoppt und danach weiterläuft. Beim iMac (Arbeitsrechner) kann ein zuvor vom Server geladenes Dokument dann nicht mehr gespeichert oder gedruckt werden.
Der MacMini hat dieses Phänomen direkt bei der Verbindung mit dem WHS gezeigt. Der iMac hat jedoch zuvor ca. 1,5 Jahre ohne Probleme funktioniert. Dieses Problem tritt bei dem iMac (Snow Leopard) erst seit ca. 6-9 Monate auf.
Da unterschiedliche WHS und OS X Versionen betroffen sind und auch unterschiedliche Fritzboxen verwendet werden und scheint ein allgemeines Problem im Zusammenspiel Windows/OS X vorzuliegen.
Bei dem iMac fällt der genaue Zeitpunkt der Verbindungsunterbrechung nicht auf.
Bei dem MacMini läßt sich der Zeitpunkt dagegen relativ leicht bestimmen. Aus der Ereignisanzeige beim Windows Server ergibt sich leider kein eindeutiges Fehlerbild. Zu dem jeweiligen Zeitpunkt taucht aber relativ oft, aber nicht immer (!), in "Windows-Protokolle Sicherheit" der Fehler 4625 ("Fehler beim Anmelden eines Kontos") auf. Dies würde auf eine Rechteproblematik hindeuten. Das Konto des Mac kann aber alles was ihm auf dem WHS erlaubt ist.
Beim Suchen nach einer Lösung (bisher leider erfolglos) bin ich u.a. auch über das Problem des Server Infrastructure License Services (silsvc) beim Windows Small Business Server 2011 Essentials gestolpert (auch alle 30 min!). Vielleicht ein Zusammenhang?
Hello,
I run the office and at home each a Microsoft Home Server. In both networks, in addition to various Windows computers, a Mac is available.
The particular "configuration" is as follows:
- Apple MacMini (Late 2011, as HTPC) with Lion via wifi via AVM Fritzbox 7390 to Microsoft Windows Home Server 2011 (Windows Server 2008).
- Apple iMac (Late 2010, desktop PC) with Snow Leopard by Lan on AVM Fritzbox 7270 on Microsoft Windows Home Server V1 (Windows Server 2003)
All operating systems on current conditions with all patches and updates.
The Fritz boxes running with the latest firmware
Now to the problem:
Both Macs are loosing every 30 minutes the contact to the server. The connection is "re-"established about 1-2 minutes later. On MacMini (HTPC), the film or music is stopped for the above period. Thereafter, the film / music goes on. With the iMac (workstation) a document loaded from the server can no longer be saved or printed.
The MacMini has shown this phenomenon directly in connection with the WHS. However, the iMac has been working about 1.5 years with no problems. This problem only occurs for about 6-9 months
Because of different WHS and OS X versions are affected and also different Fritz boxes are used and it seems to be a general problem in the interplay Windows / OS X to be present.
When the iMac is the exact date of disconnection does not occur.
With the Mac Mini, the time can however be determined relatively easily. From the Event Viewer on Windows Server is unfortunately no clear error image. At the particular time but appeared relatively often, but not always (!) In Windows Security Logs the error 4625 (Failed to log on an account) on. This would indicate a rights issue.
Searching for a solution (so far unsuccessfully, unfortunately), I stumbled over the problem of the Server Infrastructure License Services (silsvc) in Windows Small Business Server 2011 Essentials (every 30 min!). Maybe a connection?

Hi, and thank you for your reply!
My reason for not posting this in the server forum is that I suspect it is a clien issue. All my other clients connect happily to the server which leads me to believe the server is configured correctly.
Only my the two MacBook Pro's are having problems.

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