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Home » Kerio User Forums » Kerio Connect Multi-Server » problem with SMTP service: 451 4.3.2 Internal server error (SMTP not working)
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Michael Monnerie

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We want to run KCMS, but cannot start our tests because the SMTP service is not working:

# telnet kerio1.zmi.at 25
Trying 212.69.160.112...
Connected to kerio1.zmi.at.
Escape character is '^]'.
220 kc-frontend1 ESMTP ready
helo x
250 kc-frontend1
mail from: <x<_at_>zmi.at>
250 2.0.0 OK
rcpt to: <michael.monnerie<_at_>proteger.at>
451 4.3.2 Internal server error
Connection closed by foreign host.


What can we do here?

We had to change the IPs of the VMs, might that be the cause? If yes, how to solve?

[Updated on: Wed, 22 July 2015 14:38]


Michael Monnerie
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Jakub Schwarzmeier, Kerio

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Two things can, most usually, lead to this behavior:

1. You have only a single backend server deployed. At least two backend servers have to participate in the multi-server.
2. Master backend (= first backend) does not trust frontend queries. Check mailserver.cfg of the first backend for this setting:

<table name="Http">
...
<variable name="FrontendNetwork">Front-end nodes</variable>
</table>

<list name="IpAccessList">
<listitem>
<variable name="Name">Front-end nodes</variable>
<variable name="Value">192.168.0.0/255.255.255.0</variable> <!-- Frontend IP has to be in this range. -->
...
</listitem>
</list>

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