Unavailability of a certain website or even the separate page on the Internet can be caused by the different reasons. Among them - scheduled maintenance, negligence of the webmaster and also incompatibility of the website with the browser.
Instruction
1. Happens so that the same website is available to subscribers of one provider, but it is unavailable to users of another. It is explained by the fact that chains of intermediate nodes through which there pass packages from the server to the user's machine turn out different. Define what nodes are involved, in Linux it is possible by means of the traceroute utility, and in Windows - by means of the tracert program. And if one of them is unavailable, "reach" the server it appears it is impossible. Then it is necessary to use services Skweezer, Google GWT, Opera Turbo or the similar, but not anonymizing at all proxy servers - in this case the owner of the website can take you for the hacker!
2. The page can not open because of a typo in its URL. Then the message that the file is not found - so-called "error 404" is displayed. In case the typo is allowed in the most domain name, hit on a fraudulent resource is possible. Quite often it looks as real, and then users enter into it data from the account. It threatens with stealing of such data by malefactors.
3. Even at correctly gathered full address of the page it will not be displayed if the owner of the website accidentally deleted it. Also it can move it, and then all old links to this material will be invalid. Moreover, quite often in a hurry the webmaster forgets to correct such links even on other pages of own resource.
4. When the hosting provider carries out prevention, there are unavailable all or some websites serviced by him. Separate resources also become unavailable when they are updated by owners. And if the reference to a small resource is placed on another, large, according to it begins to pass a significant amount of users. The server is overloaded, and there is a so-called Slashdot-effect. He received the name in honor of the large website Slashdot, placement of links on which often results in this effect.
5. Subscribers of some providers come up against situations when access to web pages on large resources is blocked under the pretext of existence on them extremist materials though actually anything there is no similar on these pages. The provider is obliged not to allow users to such materials under the law, here only he can negligently fulfill this duty and instead of separate pages to block the whole domains of the second level.