When updating from subversion repository using tortoise svn client I get error looking like that:
Could not read chunk size: An existing connection was forci
For us the problem was an a timeout on Apache. The update was taking about 15 minutes, but Apache timed out after 10 minutes, causing our SVN server to give the error you see. The final solution was to increase the timeout setting for Apache. We use VisualSVN server - for detailed instructions on how to change this setting, look here: http://adventuresindotnet.blogspot.com/2010/09/svn-trouble.html