*nix machines unable to install packages with OpenVPN Server turned on

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Hi,

I have a Synology 6600ax router with OpenVPN Server running on it. The server works great, I'm able to log in remotely and access all my machines on my LAN just fine. The trouble is all of my *nix machines (Linux + BSD) are unable to install any packages using their respective package managers (yum, pkg_add, etc.) They all give timeout errors. These machines can otherwise ping or access DNS fine with nslookup. It does appear there may be some SSL problem (for instance, using links and accessing google.com results in SSL Negotiation timing out.)

The weird thing is if I turn of the OpenVPN server at the router, these problems go away, all the package managers and browsers work.

I'm guessing I have something misconfigured on my *nix machines or the OpenVPN server. All the Windows machines access the internet fine with the OpenVPN server on or off.

Any ideas of what to try next?

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On my BSD machine, NTP seems to be malfunctioning too. It never updates the time from any peers (or can even access the peers.)

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Any thooughts? Affects macOS too, but not iOS surprisingly.