When creating a "New" tcpClient after upgrading from .Net 1.0 to 2.0 in a console application  I got the error message "configuration system failed to initialize". It was related to the config file I was using.

I had been using an xml data file in .net 1.0 to hold settings and other dynamic data information for the application. I called the xml file the same name as the application and with an extension of ".config".

After upgrading to .Net 2.0 the ".config" extension file required certain default tags I suspect which was not in this particular xml file. I then kept getting this error when instantiating the tcpClient class. Had me confused for some time. I eventually changed the ".config" file extension to ".info" which fixed my problem immediately. I didnt even need a default app.config file, I just needed to have my data file to be named something different than ".config".

This is for anyone else that may have falled into this issue.