AHTI FTP connections
This just an idle curiosity question. I'm taking a backup using FTP. AHTI has 4 open connections - 3 control connections and one data connection. What are the 3 control connections for? Well, I know what one of the control connections is for, but what about the other 2? A new data connection is created for each 2GB chunk of the backup and there must be a bit of traffic on one of the control connections when that happens, but I assume it is the same data connection each time.


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I don't think I'll pass this on to the devlopers. They (hopefully) have better things to do than satisfy my idle curiosity. I just thought I'd ask in case the answer was common knowledge. As near as I can tell, the extra connections cause no problems; the backup works - whatever those connections are used for.
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The Protocol Overview section of the link below may help with your question:
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I'm fairly familiar with FTP. (I'm a bit rusty now, but 10 years ago it felt like I was living inside the FTP RFCs.) It's more the Actonis use of FTP that I'm puzzling over.
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Hello Patrick,
I have asked our testing and development team to have a look into this thread. Looks like the application uses the FTP in an unusual way, perhaps it is not an intended behavior, but an issue in the software.
Regards,
Slava
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I've found another odd (well, down right buggy, I think) aspect of ATI's use of FTP control connections. When deleting an FTP backups, ATI apparently opens a new control connection for each file deleted and does not close them in a timely fashon. I had ATI take a "Disks and partitions" backup of disk with 2.3GB to an FTP server. The ATI FTP client will transfer a max file size of 2GB so it created nearly a thousand .tib files for this backup. Upon deletion, my NAS with the FTP server froze after deleting about 300 of the files. And ATI hung up because it was in the middle of deleting the backup. NETSTAT showed there were hunders of open connections to port 21 on the NAS - hundreds of FTP control connections. The NAS would accept no more connections (including a HTTP connection to its admin GUI).
I needed to get the NAS working so I didn't take time to do any diagnosis. I shut down Windows, breaking the FTP connections and allowing the NAS to recover. ATI did not log the activity. (I was in a panic and don't remember what I did. I may have done a forced power off so ATI had no chance to do a clean shutdown.)
I've submitted a report ot this to Acronis support, but I'm not sure I did it properly so I've repeated the description here.
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