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Here is a problem/solution that happens to us from time to time on our Astaro Firewall. Not very often, mind you, but enough to mention.
Problem: All of a sudden the Internet seems to slow to a crawl and or down all together, using Astaro Security Gateway and the proxy is in transparent mode.
Solution: Login to the admin console and go to the http proxy settings. What I do is click on the “clear the proxy cache” option and that usually fixes my problem What clearing the cache essentially does is restart the middleware. So any action that will restart the middleware, in theory, will achieve the same goal. Will be upgrading to ver7 soon, so hopefully this won’t be an issue. I hear the proxy works much better.