Dulcy has serious networking issues since 21th Oct. There are a lot of connections hanging in SYN_SENT or ESTABLISHED state according to https://munin.openstreetmap.org/openstreetmap.org/dulcy.openstreetmap.org/fw_conntrack.html. Reboot hasn't helped and I can't find any pattern in the IPs concerned. Might be a rouge app. We might simply be reaching capacity. There might be another issue.
This is now starting to impact normal operations.