While installing a custom component the following error occur.
fsockopen(): unable to connect to :80 (php_network_getaddresses: getaddrinfo failed: Name or service not known)
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I have seen a similar issue before, enter the database and look at the table
#__update_sites make sure there is no spaces or line breaks before or after the url for the server its looking at. This was a problem in SobiPro, but if one component has that issue it basically completely breaks the extension manager.
If you do not see spaces in any of the update_sites then this is probably not the issue.