425 Can't open data connection.

Message

luccolo · #1 Post by **luccolo** » 2009-04-02 16:43

Hi everyone,

I have just upgraded FileZilla Client to the latest version (FileZilla Client 3.2.3.1) from the previous one, and now I have no more connection to my other PC (connected via ethernet cable).

What happened?

Furthermore, I lost the previous clien file and I did not find it on the FZ webpages, so I can't restore the connection.

Thanks for your kind help.

#2 Post by **boco** » 2009-04-03 00:15

This is mostly caused by a firewall not correctly recognizing that the Filezilla executable has changed. You need to check and maybe recreate the firewall rules.

luccolo · #3 Post by **luccolo** » 2009-04-04 07:47

Thank you for your kind answer, Boco, but I checked my firewalls and nothing wrong with them...

Stunner · #4 Post by **Stunner** » 2009-04-05 05:51

Be sure to correctly forward the ports on the NAT(router) you are using if you are using one.

luccolo · #5 Post by **luccolo** » 2009-04-05 07:45

thanks for your hint; I'm using a router (WAG) to connect via ethernet cables my 2 PC's, but the only use I do of FileZilla is to transfer files from one to the other.
Have I to set anything in my router? (Norton firewall has already been set properly).

#6 Post by **boco** » 2009-04-05 19:29

Disable Norton and try again.

luccolo · #7 Post by **luccolo** » 2009-04-06 21:23

Thank Boco, you was right: the guilty is Norton firewall in the PC with the FileZilla Server (I have Norton on both PC's, and if I disable ONLY Norton firewall on the PC with the Filezilla server, everything is okay).

Now the question is: how may I solve this riddle? I've tried to allow full permission in Norton firewall to the following files:
FileZilla Server.exe
Filezilla Server interface.exe

but the problem is still alive

Is there anything else that I have to set in the firewall?

I would like to remember that I use FileZilla only for exchanging files between my PC's, and I do not do any upload via Internet with it.

Thanks for any hints ....

Stunner · #8 Post by **Stunner** » 2009-04-07 07:19

Look into the settings and see if you can forward ports for the firewall, if so forward the ports that FileZilla is using. I would say ditch Norton Firewall though, Comodo is a free firewall and it is just as good, if not better.

luccolo · #9 Post by **luccolo** » 2009-04-07 08:37

Thanks, now it is working, but the transfer speed is now very slow (about 800KB/sec instead of 10 MB/sec). What could it be happen?

#10 Post by **boco** » 2009-04-07 22:31

Firewalls inspect the traffic running through (packet inspection, SPI). That can reduce speed, extremely in some cases.

luccolo · #11 Post by **luccolo** » 2009-04-08 07:45

Thanks Boco, but I would be happy if this happened only in "some cases". Unfortunately it happens every time, and the speed (in particular with large video files) is steady at 780-800 kb/sec.

Do have I to check anything?

#12 Post by **botg** » 2009-04-08 08:24

"Some cases" in the sense of for "some users".

Another thing, you are mixing kb and KB. Please use B for bytes and b for bits.

luccolo · #13 Post by **luccolo** » 2009-04-10 10:09

Sorry, my mistake: I meant KB/sec.
Anyway, the problem is still present: sometimes everything goes right (10M. per sec.), but sometimes I have slow bitrate: nothing more than 800KB/sec, and I don't know why.

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