Why do many valid links in my blog show error 500 in Google WebMaster Tools?

• If Googlebot, Google's crawler, runs into an issue while crawling your site and doesn't understand a page on your site, it will give up and go on. This means that your page will not be indexed and will not be visible to search engines, which will have a significant impact on your search results.
• A 500 error indicates that something went wrong with a website's server and it was unable to fulfil your request. Something on your server was preventing Google from loading the page in this circumstance.
• To begin, verify the page in your browser to see whether it can be loaded. If you can, there's a strong probability the problem has gone away, but you should double-check.
• Inquire with your IT team or hosting firm whether the server has been down recently, or if there's a setup that's preventing Googlebot and other crawlers from reaching the site.

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