[Proftpd-user] Problem with a lot of connections

Hello!

I have a server, Ubuntu, (5.4.0-53-generic) with ProFTP (ProFTPD 1.3.6c).

On this we have a LOT of IoT devices logging in at the SAME account. There is
about > 100 of those devices connecting at exactly(!) the same time. They run
on a GPS clock and the connections is within ms. 

Very often they can connect, login, create the file to be transfered,
and then deliver data but sometimes they can't deliver data.

One potential problem is that our net operator is NAT:ing all our devices
and they get the same IP-nummber. And this could be a resource problem
in their NAT software. One other potential problem is ProFTPD cand handle
this many passive FTP connections.

<pre>
2020-11-28 07:10:15,890 ajabsab proftpd[890999] ajabsab (193.181.246.218[193.181.246.218]): Data transfer stall timeout: 600 seconds
2020-11-28 07:10:15,891 ajabsab proftpd[890999] ajabsab (193.181.246.218[193.181.246.218]): Transfer aborted after 0 bytes in 583.64 seconds
2020-11-28 07:10:15,891 ajabsab proftpd[890999] ajabsab (193.181.246.218[193.181.246.218]): notice: user ftp-incomming: aborting transfer: Data connection closed
2020-11-28 07:10:15,891 ajabsab proftpd[890999] ajabsab (193.181.246.218[193.181.246.218]): dispatching POST_CMD_ERR command 'STOR data.json' to mod_exec
2020-11-28 07:10:15,891 ajabsab proftpd[890999] ajabsab (193.181.246.218[193.181.246.218]): dispatching POST_CMD_ERR command 'STOR data.json' to mod_quotatab
2020-11-28 07:10:15,891 ajabsab proftpd[890999] ajabsab (193.181.246.218[193.181.246.218]): dispatching LOG_CMD_ERR command 'STOR data.json' to mod_log
2020-11-28 07:10:15,891 ajabsab proftpd[890999] ajabsab (193.181.246.218[193.181.246.218]): dispatching LOG_CMD_ERR command 'STOR data.json' to mod_xfer
2020-11-28 07:10:15,891 ajabsab proftpd[890999] ajabsab (193.181.246.218[193.181.246.218]): FTP session closed.
2020-11-28 07:10:20,904 ajabsab proftpd[890755] ajabsab (193.181.246.218[193.181.246.218]): FTP no transfer timeout, disconnected
2020-11-28 07:10:20,905 ajabsab proftpd[890755] ajabsab (193.181.246.218[193.181.246.218]): FTP session closed.
2020-11-28 07:10:21,489 ajabsab proftpd[890795] ajabsab (193.181.246.218[193.181.246.218]): FTP no transfer timeout, disconnected
2020-11-28 07:10:21,490 ajabsab proftpd[890795] ajabsab (193.181.246.218[193.181.246.218]): FTP session closed.
2020-11-28 07:12:23,997 ajabsab proftpd[890817] ajabsab (193.181.246.218[193.181.246.218]): FTP no transfer timeout, disconnected
2020-11-28 07:12:23,998 ajabsab proftpd[890836] ajabsab (193.181.246.218[193.181.246.218]): FTP no transfer timeout, disconnected
2020-11-28 07:12:23,998 ajabsab proftpd[890817] ajabsab (193.181.246.218[193.181.246.218]): FTP session closed.
2020-11-28 07:12:23,999 ajabsab proftpd[890836] ajabsab (193.181.246.218[193.181.246.218]): FTP session closed.
2020-11-28 07:16:17,789 ajabsab proftpd[891183] ajabsab (193.181.246.218[193.181.246.218]): FTP no transfer timeout, disconnected
2020-11-28 07:16:17,790 ajabsab proftpd[891183] ajabsab (193.181.246.218[193.181.246.218]): FTP session closed.
</pre>


--
Göran Hasse
Raditex Control AB
Boo 229, 715 91  ODENSBACKEN
email: [email protected]
Mobil: 070-5530148
www: www.raditex.nu


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