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4. Server 500 error . 500 the cause of the error is a lot of, but you have to know, 500 error is the server internal error, and the general program is the ASP error is many, may be your user rights caused by the problem, or the database connection error, then you should check the server statement error problem.

6. Server 501 error. Server 501 error is the server or does not have the request function, and 501 error reason is not implemented, can be used to HttpWebRequest specify a useragent to try, sometimes you can change the computer to test.

8. Server 502 error. This is a wrong gateway on the server, so that it is invalid, we have a server 502 error problem, it is best to clear the cache or on the server to try to refresh, because 502 errors involved in a lot of problems, it is best to let the program come and go in the server up and down the article.

10. Server 503 Error . Service is not available is a state, then after the server 503 error occurs, you do not have to worry about, the server may be maintenance or paused, you can contact the server space provider. There are times when CPU usage is large.

12. Server 504 error. This indicates that the gateway timed out is a phenomenon. 504 error problem is a difficult problem, of course, you have to try to get in touch with the official website, seriously to check the different computer simple IP transmission status. And this 504 mistake to professional person in charge to solve.

14. Server 505 Error . HTTP version is not supported, the general of the browser under the default is 1.x version, if there is an HTTP 1.1 version, then you need to set up under the advanced Internet Options.

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