It was quite surprising today when we were having problems with the proxy, and then we noticed that TortoiseSVN would override command line svn. Is that suppose to happen?
A:
TortoiseSVN internally uses svn client libraries to communicate with the server. Hence both are shared the configuration. SVN proxy FAQ describes this.
If you would like to alter the proxy for commandline client you can have a svn wrapper batch file which will include --config-option with proxy configurations information in it.
Version Control Buddy
2010-10-15 11:36:32