How does the server open firewall affect SEO?

Recently found a customer's corporate web site domain name was inexplicably brought on the "? Jdfwkey" character. Suddenly think of this month, IP138 seems to be the case, the site appears similar to the "Http://www.ip138.com/?jdfwkey=bxfux" situation.

So Baidu search IP138, sure enough, IP138 's homepage have been added "? Jdfwkey" characters, and Baidu repeated collection, and the normal web site can access.

The little tail behind the URL looks awkward.

Consulting the space business, presumably means that the site is the server "upgraded the hard", using the Shield anti-DDoS firewall, when the CC policy is turned on, so that when the site is visited, after the domain name will produce a random verification code.

Originally, this is the server upgraded the hard defense, the use of the Shield firewall, when the anti-CC policy, after the domain name will produce a verification code, but does not affect the normal access to the site, and this also shows that space has increased security measures to ensure that the site is not easily attacked. So it appears that the full name of Jdfwkey should be "Jindun fire wall Key", then this character "Jdwkey=bxfux" means: J (gold) d (Shield) W (Wall-wall) key (authentication code) =bxfux (code number).

Query related data, summed up the "Server open Firewall Pros and cons":

Lee: Open the Shield firewall does not affect the site access, increase security measures to ensure that the site is not easily attacked.

Disadvantages: With the opening of the hard to prevent, obviously affect the spider on the page crawl, reduce the weight of the search engine, affecting the statistics of some sites (different traffic statistics site "search engine" and "keywords" data statistics error), the impact of friendship links.

In this case, it is recommended that you close the firewall as much as possible before you receive an attack, so as not to produce unpredictable consequences. At least open the firewall, access to the network will be slow, and then affect the user experience, this SEO and included indeed some impact. Your site access experience is reduced, can not reduce the search engine on your site's favor? Besides, the domain name behind a tail does not seem to look very good oh.

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