Author: René Jorissen

René Jorissen works as Solution Architect for QMonkeys in the Netherlands. Network Infrastructures are the primary focus. René works with equipment of multiple vendors, like HPE Networks, FortiNet, SentinelOne, Phished, Holm Security, Microsoft services and many more. René is Aruba Certified Edge Expert (ACEX #26), Aruba Certified Mobility Expert (ACMX #438), Aruba Certified ClearPass Expert (ACCX #725), Aruba Certified Design Expert (ACDX #760), CCNP R&S, FCNSP and Certified Ethical Hacker (CEF) certified. You can follow René on Twitter and LinkedIn.

Security

Serious DNS Vulnerability

René Jorissen on July 24, 2008 • 0 Comments • Tags: #dan #dns #kaminsky #vulnerability

I guess you already read about it, but if not here a short outcome. Despite Dan Kaminsky’s efforts to keep a lid on the details of the critical DNS vulnerability he found, someone at the security firm Matasano leaked the information on its blog yesterday, then quickly pulled the post down. But not before others … Read More

Switching

IBM Blade with Nortel and HP switches

René Jorissen on July 23, 2008 • 0 Comments • Tags: #blade #channel #hp #ibm #lacp #nortel #problems #switches #vrrp

Today I had to troubleshoot an IBM Blade system. The customer was complaining that all servers, except one, weren’t able to communicate with the rest of the network. The blade system contains two Nortel switches. Each Nortel switch is connected with a 3 Gbps LACP channel to separate HP switches. The HP switches are the … Read More

Configuration Example

Auto Backup Configurations

René Jorissen on July 21, 2008 • 2 Comments • Tags: #archive #auto #backup #configurations #cron #occurrence

Till recently I didn’t have a decent way to backup configurations from routers and switches without using some kind of management tool, like Cacti or Nagios. I wanted to automatically backup configurations by only using a TFTP or FTP server on a network. I started looking and found the solution by using the archive and … Read More

Other stuff...

Blog offline.. and online again

René Jorissen on July 19, 2008 • 2 Comments

This blog was offline for a couple of days, because my ISP thought it would be cool to change the public IP address. I bought a house with my girl and we are still rebuilding the place. However the end is near. I already signed up with an ISP, which is XS4ALL. It is always … Read More

Proxy

Automatic Log In Reverse Proxy with FBA

René Jorissen on July 10, 2008 • 2 Comments • Tags: #2006 #authenticate #automatic #based #fba #form #in #isa #log #owa #post #proxy #reverse #statement

Recently I configured another ISA 2006 server as reverse proxy to publish the Exchange 2007 OWA environment on a secure way to the internet. The customer where I configured the reverse proxy is migrating from Novell GroupWise to Microsoft Exchange. During the migration period, the customer has specific requirements when connecting to the webmail environment … Read More

Proxy, Security

ISA 2006 Authentication over HTTP

René Jorissen on July 8, 2008 • 0 Comments • Tags: #12250 #2003 #2007 #403 #authenticate #block #code #error #exchange #forwarding #http #over #owa #proxy #requests #require #reverse

I implemented different ISA 2006 Reverse Proxy servers in conjunction with Microsoft Exchange 2003 or Windows Exchange 2007. Today I configured ISA 2006 with Exchange 2007. I configured the Reverse Proxy server as I did always. And the connection from outside the network works perfectly. On the internal Exchange server I configured Basic and Integrated … Read More