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Practical 365

Microsoft Is Changing How They Publish Office 365 IP Addresses and Urls for Firewall and Proxy Access

May 2, 2018 by Paul Cunningham 6 Comments

office  ip ranges powershell sample

In a recent announcement in Message Center, Microsoft is letting customers know about upcoming changes to how Office 365 IP address and URL details are published.

Blog Change Alerts, Firewalls, Networking

Beware of Bad Advice About Exchange Servers and Windows Firewall

October 12, 2015 by Paul Cunningham 14 Comments

windows firewall bad advice

You should not disable the Windows Firewall on Exchange servers.

Exchange Server Exchange 2013, Exchange 2016, Firewalls, Security, Windows Server

Network Ports for Clients and Mail Flow in Exchange 2013

March 11, 2015 by Paul Cunningham 14 Comments

IC

Microsoft has published detailed information about Exchange Server 2013 network port requirements.

Exchange Server Exchange 2013, Firewalls, Networking, Security

Publishing Exchange 2010 POP3 with ISA Server 2006

March 27, 2011 by Paul Cunningham 1 Comment

exchange  pop isa  b

This tutorial demonstrates how to configure ISA Server 2006 publish POP3 and the alternate client mail submission port to allow Exchange 2010 mailbox access by remote email clients.

Exchange Server Exchange 2010, Firewalls, ISA 2006, pop3, post office protocol, Remote Access

Well-designed security systems fail gracefully, SonicWALL does not

December 6, 2008 by Paul Cunningham Leave a Comment

To quote Bruce Schneier, “well-designed security systems fail gracefully”.  This means for example when the ISA firewall service fails it closes off network connectivity entirely (ie retains security) instead of opening your entire network up (ie decreases security). This week SonicWALL’s license servers suffered a glitch rendering thousands of customer units useless and leaving the […]

Exchange Server Firewalls, ISA Server, Security, SonicWALL

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