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FTP Retrieve Errors

 
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ais@rkelly.me.uk



Joined: 24 Sep 2006
Posts: 9

PostPosted: Sat Oct 15, 2016 10:01 am    Post subject: FTP Retrieve Errors Reply with quote

AISBackup 4.2.419
Have had to switch one backup to FTP due to port blocking imposed by my company. Am backing up to a Zyxel NSA325v2, which has pureftp as the service. It hangs regularly during the backup - specifically when retrieving files, so I have switched the FTP server to proftpd. With this service a backup completes no problems, but any retrieval (for example retrieving the job file) stalls.
Turning on FTP debug shows a RETR request sent and two 150 responses in the same packet from pureftp:
150-Accepted data connection
150 5077.7 kbytes to download

From proftpd I get a singe 150:
150 Opening BINARY mode data connection for......

However in either case the retrieval never starts. I am fairly sure the problem is not with the FTP server (now) as a simple GET of the same file from the windows ftp client works no problem.

I guess the question is, does AISBackup look for something very specific prior to initiating the retrieval of data?
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Barry
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Joined: 20 Aug 2002
Posts: 1491

PostPosted: Mon Oct 17, 2016 10:08 am    Post subject: FTP retrieve problem Reply with quote

Have you tried with / without 'passive mode'?

Manage Backup / Change Backup Job Settings / FTP Settings

It may also be worth checking that the latest firmware is installed on the Zyxel. I have been using an older Zyxel (NSA320) for several years for a few daily backups without problem.

Barry
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ais@rkelly.me.uk



Joined: 24 Sep 2006
Posts: 9

PostPosted: Mon Oct 17, 2016 11:47 am    Post subject: Reply with quote

Tried both PASV and standard mode with no difference...
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Barry
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Joined: 20 Aug 2002
Posts: 1491

PostPosted: Tue Oct 18, 2016 3:03 pm    Post subject: FTP retrieve problem Reply with quote

Have you got SSL encryption enabled? if so try without as a test.

Is this backup over a WAN or LAN?

Barry
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ais@rkelly.me.uk



Joined: 24 Sep 2006
Posts: 9

PostPosted: Tue Oct 18, 2016 3:11 pm    Post subject: Reply with quote

SSL not enabled. Backup over LAN. I can send packet traces if it helps...
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Barry
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Joined: 20 Aug 2002
Posts: 1491

PostPosted: Wed Oct 19, 2016 12:04 pm    Post subject: FTP retrieve problem Reply with quote

There is of course a possibility that there is a problem in AISBackup despite the FTP interface has been used regularly by several of our customers for many years. The log file may be useful so please send a copy to customerservices@aiscl.co.uk

As you mentioned port blocking, it may be useful to check that ports 20 and 21 are both open for TCP/IP connections on your private network (assuming the PC in question belongs to the private network). Maybe you could temporarily disable your firewall and re-test?

Barry
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ais@rkelly.me.uk



Joined: 24 Sep 2006
Posts: 9

PostPosted: Thu Oct 20, 2016 9:12 am    Post subject: Reply with quote

Managed to borrow another laptop and install AISBackup on it, and that works just fine. It looks like you are entirely correct and it is a firewall issue - I can't work out what though, so will have to take it up with IT next time I am over there. Thanks.

Interesting discussion here: http://www.ncftp.com/ncftpd/doc/misc/ftp_and_firewalls.html

includes the comment: If you can login to an FTP server, but your directory listings and data transfers time-out you most likely have a firewall in the way. - whuich is exactly my problem.
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