I've just upgraded to 9.353-4 and am still having a problem with PPTP connections not working. The error without the PPTP connection tracking helper checked is 619 but this changes to error 800 with the helper checked. The GRE packets are no longer being rejected at the external address the the tunnel will not establish. Oh well, I need to reinstall and downgrade the UTM yet again. With any version of UTM prior to 9.353-4, PPTP works without a problem.
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