Question

I know how to checkout but when I try to commit it gives me this message:

svn: Commit failed (details follow):
svn: Server sent unexpected return value (405 Method Not Allowed) in response to 
     MKACTIVITY request for '/svn/!svn/act/25696683-c16a-45c6-9c35-9431e92548ec'

Answer 1

The goggle code ticket 1916 has all the possible causes for this:

“405 Method Not Allowed” usually means you have an HTTP proxy somewhere which is blocking WebDAV HTTP request such as MKCOL.
The proxy might be on your network or ISP, or it might be built into Windows.
Either way, this is a client-side problem (not related to googlecode.com), and is best handled by posting to the general svn user-support group at [e-mail].

Basically, you need to triple-check your username and password. Also:

try checking out a fresh https:// working copy for svn-wagon to use.
The server certificate changed, and svn-wagon may just be failing because of that
(rather than properly re-prompting you whether to trust the certificate or not.)