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I have a VM behind a pfSense router hosted on OVH Cloud. The VM is experiencing issues connecting to websites/services periodically. It appears it is being blocked, unblocked and then blocked again. For example the https://www.microsoft.com website loads perfectly over and over. If I try to access https://www.outlook.com the site is blocked and the https://www.microsoft.com website is no longer accessible for a period of time then becomes accessible again. I need to know the precise cause and a permanent resolution.