A personal firewall is provided by GlassWire. This avoids the use of malware for nefarious reasons on my network. It believed NordVPN was up to no good on this occasion. NordVPN proposed a shift to the glasswire.conf file of GlassWire to get around the issue.
Instead of hostname_enable_lookup = true, the setting should be false. This might solve the problem.
Let me know if it worked.