Exchange 2010/2013: Which computer uses a Relay Connector?

Receive connectors that do not require authentication are needed to allow systems to send mails that do not support authentication. This is normally not a problem if the connectors are configured correctly. However, I have often seen that entire subnets are allowed to send mails everywhere without authentication (historically grown this way). Replacing something like this is ... Read more

Outlook 2010: Deactivate Outlook Anywhere (RPC over HTTPS) via GPO

Outlook Anywhere (RPC over HTTPS) can only be switched on or off on the Exchange servers. Unfortunately, it is not so easy to configure which users are allowed to use Outlook Anywhere. Although access to Active Directory groups can be restricted using Forefront TMG, every client is configured for Outlook Anywhere using Autodiscover. However, this has ... Read more

Exchange 2010: Fix problems with downloading the offline address book

From time to time there are problems when downloading the offline address book, the causes are often different and have different error messages. The following instructions describe how to "start again" with a fresh offline address book (OAB), which solves most problems. First stop the "Address book" and "File distribution" services Now delete the defective OAB Next, delete the files from the old ... Read more

Subordinate certification authority for Sophos UTM HTTPS CA (Web Filter)

My small Sophos UTM filters HTTP traffic (Web Filter) and scans it for viruses and malware, which works quite reliably, unless the websites are encrypted (HTTPS). By default, the UTM cannot scan encrypted traffic and therefore cannot filter out viruses/malware. However, this can be easily changed. In the ... Read more

Windows Server 2012 R2: First impressions

I've just started installing the new Windows Server 2012 and playing around with it a bit. Here are my first impressions: The installation is the same as with Windows Server 2012, which was to be expected. After the installation, the server boots directly to the desktop and does not start the Server Manager immediately, which I find ... Read more

Exchange 2013: 451 4.7.0 Temporary server error. Please try again later. PRX2

In my fish Exchange 2013 test environment I could not send any mails, all Exchange 2013 reported the error "451 4.7.0 Temporary server error. Please try again later PRX2": 220 EX1.frankysweb.local Microsoft ESMTP MAIL Service ready at Sat, 31 Aug 2013 19:30:39 +0200 HELO EX1 250 EX1.frankysweb.local Hello [192.168.200.101] MAIL From: 250 2.1.0 Sender OK RCPT To: ... Read more

Email made in Germany... with Exchange!

Everyone is talking about it at the moment: the secret services are reading. Telekom, GMX and Web.de are taking advantage of the current discussions on the subject and have recently started offering "E-Mail made in Germany". A little background: The three have decided to encrypt the transport route of the mails, i.e. the communication between GMX, Telekom and Web.de mail servers. ... Read more

Exchange 2007/2010/2013: New updates

New security updates for Exchange 2007, 2010 and 2013 were released yesterday. However, the update for Exchange 2013 was withdrawn today due to problems. Unfortunately, this seems to be happening more frequently recently. If you have already installed the update for Exchange 2013, you can find a workaround to fix the problems here:

http://support.microsoft.com/kb/2879739

I'll probably wait a little longer until I install the updates...

If you can't or don't want to wait, you can find the packages here:

http://blogs.technet.com/b/exchange/archive/2013/08/13/released-exchange-2007-and-exchange-2010-rollups-and-exchange-2013-security-updates.aspx