NO ROUTE TO HOST network request from container to host-ip:port published from other container

General Discussions
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Hello,

Do you ask the difference between 172.17.0.0/16 and 172.17.0.0(without /16)?

As far as I know, 172.17.0.0/16 means the network prefix is first 16 bits. This matches all IP addresses that begin with 172.17, for example, 172.16.20.30, while 172.17.0.0 matches only that address.