Hi @Akananda Singhania, I suspect your network configuration on your Docker Engine host is incorrect. Running the image you listed works as anticipated in a few of the environments available to me. Let's try to confirm this suspicion by running the following: docker run busybox ping -c 1 files.grouplens.org You should receive output similar to the following. If not, the configured DNS server is not appropriately routing to external sites. PING files.grouplens.org (128.101.34.235): 56 data bytes 64 bytes from 128.101.34.235: seq=0 ttl=37 time=39.263 ms --- files.grouplens.org ping statistics --- 1 packets transmitted, 1 packets received, 0% packet loss round-trip min/avg/max = 39.263/39.263/39.263 ms Could you provide more details about your environment in which you are running Docker? Of interest would be the output of cat /etc/resolv.conf Another option is to try explicitly specifying a DNS server such as those that Google makes available via a command such as: docker run --dns 8.8.8.8 -d -p 8080:8080 apache/nifi ... View more