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Packet Heroes Quiz - November Challenge Question! Win an IOTA!


What is the Heroes of Packet Analysis Quiz?

The Heroes of Packet Analysis Quiz is an annual quiz, hosted by Profitap with the goal of challenging and educating participants in the area of packet analysis and network visibility. All Heroes of Packet Analysis have years of networking experience and are experts in their field. Join the quiz and match your skills with those of the Heroes themselves.


Sake Blok – Ticketing System

One of your customers is running a ticketing system that periodically performs a mail import from a Microsoft mailbox in the cloud. The customer complained that the import sometimes fails. You captured the network traffic to and from the ticketing system.

Based on the logging of the mail import, you extracted the following session that failed.

Can you tell from THIS .pcapng trace why the import failed?

Click Here for main page to enter your answer and to find out more about what you can win! WIN AN IOTA!


Sake’s LinkedIn

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Wireshark Wiki = Sake's



Sake Blok

My interest in Networking was first raised when I started working for one of the first ISP's in The Netherlands (back in 1995). My L2/L3 knowlegde was gathered while working for a large bank. I then switched teams within that bank to manage their redundant internet gateway based on a loadbalanced firewall cluster, loadbalancers, ssl-offloaders, caches and proxies. In that time (2000) I started using Ethereal to troubleshoot problems within that environment. After my switch to a reseller, my skills developped towards bug-chasing and Ethereal/Wireshark has been an invaluable tool for me. I use it on a daily basis.

In february 2006 I wished to be able to filter on the "X-Forwarded-For:" http-header and joined the mailing-lists. First I wanted to ask for that functionality, but then I realised that I might be able to add it myself. Well, one thing led to another and after submitting a few of my own patches, I started working on bug-reports too. Resulting in being invited to the core development team in august 2007.

I live in The Netherlands near Amsterdam and have started the company SYN-bit in February 2010. SYN-bit specializes in troubleshooting services for Application Delivery Networks. Analyzing traffic flows to the bit level to solve design flaws, bugs. But also for exploring the best way to optimize application delivery. I also give training and do remote packet capture analysis

Feel free to contact me at: sake [at] SYN-bit [dot] nl

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