Express VPN which is SSL based OpenVPN, or try ). SSL VPNs will do this automatically without messing up settings (e.g. Try to use HTTPS instead of HTTP which is: instead of, sometimes company forgetting to filter HTTPS sites.
Following general methods are worth to try:. Block all access to youtube, except for selected videos. Allow selected sites:, , .īlock all access to a domain, except to the mail server using HTTPS and to the main page. If no such filter exists, go back to step 1 and try the next subdomain. Pick the filter with the longest path prefix, and apply it. Among the current filters, remove those that don't have /mail/inbox as a prefix of the path. Among the current filters, remove those that have an exact port number and it not 80. Among the current filters, remove those that have a scheme that is not http. 
If that fails, then try again with, com, and finally "".
First find filters for, and go to step 2. When you allow, every occurrence of the key should have a matching value.Īllowing /watch?v=V2 does not allow /watch?v=V1&v=V2. When you block, any occurrence of the key-value pair is sufficient. This includes any URL scheme, such as, , and chrome://policy.ĭenies all requests to /stuff and its subdomains.ĭenies requests to this exact IP address.ĭenies any request with the query ?video=100.ĭenies any request with the following queries: Denies requests to but not its subdomainsĭenies all requests except for those to blocklist exception URLs. Denies all HTTPS requests to any domain.ĭenies requests to but not to or .ĭenies requests to but not its subdomains, like /docs. If no filter ever matches, the default is to allow the request.ĭenies all requests to, and sub.ĭenies all HTTP requests to and any of its subdomains, but allows HTTPS and FTP requests. If a filter is still available, the filter decision, to block or allow, is enforced. If no valid filter is left at this stage, the host is reduced by removing the left-most subdomain, and starting again from step 1. From these filters, the filters with the longest set of query tokens are selected. From these filters, the filters with the longest matching path are selected. Filters with a non-matching scheme or port are discarded. The filters with the longest host match are selected. only matches exactly Filter selection process (dot) prefixing the host, only exact host matches are filtered. When both a block and allow filter apply at step 4 below, with the same path length and number of query tokens, the allow filter takes precedence. Wildcards ( *) are the last searched, and match all hosts. The filter selected for a URL is the most specific match found. If it is the case, that suffix is ignored. For example, If you include a reference separator #, it is ignored along with everything that appears after it. You can include user:pass fields but they will be ignored. The filters format is very similar to the URL format. The patterns custom:app or custom://app are invalid. The patterns custom://* or custom:* are valid and match custom:app. The scheme and the host are case insensitive, but path and query are case sensitive. 
Custom schemes are supported, but only the patterns scheme:* and scheme://* are allowed. Supported standard schemes are:Īll other schemes are treated as custom schemes. You can use either a standard or a custom scheme. A query token can optionally end with * to indicate prefix match.
Must be a valid port value from 1 to 65535.Ī set of key-value and key-only tokens delimited by &. (dot) can prefix the host field to disable subdomain matching. For details, see Schemes you can use.Ī valid hostname or an IP address. This field is optional, and must be followed by ://.
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