Can t open data connection FTP error?

The error happens when the ftp server tries to open this data connection and can’t reach that port on the ftp clients side. The blocking of the ftp server from reaching the ftp client can be at either ends firewall, or something in between.

Can t open data connection FTP FileZilla?

2 Answers. You have most probably not opened the data connection ports on the firewall of the server (or have not forwarded the ports on NAT, if there’s any). Check what ports the FTP server is using and open/forward them. Another problem is, that you have not configured a correct external IP address in the FTP server.

What is FTP port command?

The PORT command is issued by the client to initiate a data connection required to transfer data (such as directory listings or files) between the client and server. The PORT command is used during “active” mode transfers.

How did the ancestors come up with the idea of wings?

Scientists generally agree that wings must have been exaptations; they were used by the ancestor for one function, and became useful for flight among the descendants (if they weren’t exaptations, then they were adaptations, which would mean that they were wings already used for powered flight; a circular argument).

Why are jet engines not above the wings?

It seems that most airliners put the engines below the wings, i.e. the Boeing 7*7 series and the Airbus A3** series. This requires long (heavy) landing gear, and the engines are close to the ground which may cause damage to the engines (ingest debris) or the ground.

Why did bipedal animals evolve to have wings?

Wings evolved because bipedal animals were leaping into the air; large wings assisted leaping. (This is possible; any amount of wing could assist leaping.

How can we understand the evolution of flight?

In summation, to understand the evolution of a flying lineage, we must follow these steps in this order: (1) Understand the phylogeny of that group; what its origins were. (2) Understand the functional morphology relevant to flight, and how that changed from the nonflying ancestor to the earliest flyer.