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.
Beware of Bad Advice About Exchange Servers and Windows Firewall
You should not disable the Windows Firewall on Exchange servers.
Network Ports for Clients and Mail Flow in Exchange 2013
Microsoft has published detailed information about Exchange Server 2013 network port requirements.
Publishing Exchange 2010 POP3 with ISA Server 2006
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.
Well-designed security systems fail gracefully, SonicWALL does not
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 […]
Tom Shinder on “hardware” firewalls
Tom Shinder of ISAServer.org takes an amusing shot at the myth in some circles that a “hardware” firewall or “firewall appliance” offers more security than a Microsoft ISA Server firewall. I was drawn to a particular quote in his article about the relative security of ISA Server to other popular firewalls in the context of […]