Non-standard 999 HTTP response code
The HTTP status code 999 is an unofficial status code returned by Linkedin. For example, opening a company page as an unauthenticated user will result in an HTTP 999 response status code. Web crawlers that do not respect Linkedin's robots.txt have to deal with Linkedin's 999 HTTP response code.
Only a few web crawlers from Google, Microsoft, and Apple are allowed to crawl parts of Linkedin.
You can get the HTTP 999 response code returned as an error when using broken link checkers. If you are curious about what this means. No worries, most likely there is no problem with the link to for example your company page. The broken link checker should respect Linkedin's robots.txt, which tells bots to ignore links to Linkedin.
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