I see outdated settings in /etc/resolv.dnsmasq
192.168.234.11 and 192.168.184.19 it are old servers.nameserver 192.168.234.11
nameserver 192.168.184.19
nameserver 192.168.234.21@eth0
nameserver 194.29.36.241@eth0
192.168.234.21 and 194.29.36.241- it are new DC/DNS servers.
It seems dnsmasq is still using old servers.
QNAP: TS-831-XU
Firmware: 4.5.3.1670