Am 14.04.2016 um 23:53 schrieb Marcelo Ricardo Leitner:
Otherwise it won't be able to expect the new connection
sounds reasonable, on the other side the client yesterday had troubles
to make passive ftp connections with "connection refused" as far as the
admin was able to tell on the phone
maybe unrelated and random, we solved that anyways by switch to a
webservice on both sides and avoid FTP entirely but since there are many
FTP transactions from webcams every few minutes and all the "partial
matching of `227 '" came from the same IP containing 227 - hmm
It could be that the drop happened and an auxiliary connection was
attempted before the retransmission of the 227 reply, so your firewall
didn't know about it and actively blocked the connection. If it had
silently dropped the new connection request, the client probably would
retransmit the SYN after a bit.
Now why the cameras are triggering it, good question
not the cameras - a ordinary client with filezilla, that one with 227 in
his IP address, the cameras blow their images without any problem on the
FTP server
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