Why does ssh/sftp fail with "Ncat: Connection Timed out" errors on Red Hat Enterprise Linux (RHEL) 7 clients when using the "nc" command to connect to the proxy?

Solution Unverified - Updated 2018-04-30T22:53:23+00:00 -

Issue

I am using nc as the ProxyCommand for the ssh or sftp client on RHEL7, but the connection times out with the following message:
```
    Ncat: Connection Timed out
```
I am using the following ProxyCommand for ssh or sftp:
```
    nc -v -x <proxy_ip>:<proxy_port> %h %p
```
I do not have the same issue when using RHEL6 clients

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