A customer reports that they have some hosts that can only be accessed from one particular device in their network, something that is called the "jump-host", and those hosts can only be accessed using SSH.

Prior to version 7.0.17, they were successfully using SSH items like this:

And what made this item work by going to the end device through the "jump-host", was this ssh configuration (in .ssh/config file) that was created for "zabbix" user in the Server/Proxy:

Host whatever*.domain
  ProxyCommand ssh -q -oStrictHostKeyChecking=No special_user@jump-host /bin/nc %h %p

Since 7.0.17 it now doesn't work, outputting this message:

Cannot connect to SSH server: getaddrinfo() failed for 'whatever34.domain': [1] Unknown host

This issue arose for them in version 7.0.17 due to this ZBX:
https://support.zabbix.com/browse/ZBX-26571

Specifically, the issue appears to happen because due to this change, DNS names are now resolved by Zabbix, rather than SSH itself.