ZyXEL Communications P-792H User Manual page 392

Chapter 36 Menus 24.8 to 24.11
You have disabled that service in menu 24.11.
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The IP address in the Secure Client IP field (menu 24.11) does not match the
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client IP address. If it does not match, the P-792H v2 will disconnect the session
immediately.
There is an SMT console session running.
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There is already another remote management session with an equal or higher
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priority running. You may only have one remote management session running at
one time.
There is a firewall rule that blocks it.
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P-792H v2 User's Guide