Tortoise SVN Solution:
I just happened to me today, working on Windows 7, trying to use svn from git bash. Any command that I used that tried to get to the server will receive the same: "Verification of the server certificate failed: the certificate has expired, the issuer is not trusted." Usually, just continuing to try to get to the server, you will call svn and ask if you trust the server. If you say yes, then everything will be fine.
However, this time there was none of this. I finally noticed that the svn that I used was part of the Tortoise SVN installation. So I stopped File Explorer and tried updating my directory using Tortoise controls.
The turtle did a great job. I got a window asking if I trusted the server. I said yes forever. Then he asked me to enter a username and password. After I gave this, Tortoise updated the folder, and when I tried to interact with the server via the command line, that was fine too.
Bottom line: If you use Windows using the svn command line as part of the Tortoise package, try updating it directly through the Tortoise controls.
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