Tons of connections from "System Process", Error 421
Posted: 2008-03-19 20:10
I've searched but haven't found a match for my problem yet. I'm connecting to a server that allows 8 simultaneous connections. I set the max transfer to 4 and max connections to 8. I figure that the server only allows 8 connections, and each transfer needs two connections (one for control, one for data). Is my reasoning right here?
The bigger problem is that it works fine for a while, but eventually it stops working and just sits there getting "421 Too many connections (8) from this IP". I opened TCPview to see how many connections there really were, and it seems like the filezilla process only has 3 connections open on port 21. However, the "System Process" has tons of connections open on port 21, with more being opened all the time. I've attached a screenshot of what this looks like.
When I first start transferring files, I can see that Filezilla has 4 port 21 connections open and keeps opening/closing the data connections on random ports (max 4 at a time). However, eventually the "System Process" starts opening up port 21 connections, very slowly. Once they open, they stay for a long while (5-10 minutes?) then eventually time out and close. Is filezilla causing these System Process FTP connections? What else could be causing them? I've killed all other processes except system process/services, and nothing obvious remains to cause these.
Update... I was just monitoring the file transfer behavior, and noticed something. If I limit the connections to 8 and the transfers to 4, it works for a while. If I up the transfers to 5, eventually it gets a "Too many connections", and that's when the System Process connection shows up. Every time filezilla tries to reconnect and fails, a System Process connection is made. Any ideas why this is happening?
The bigger problem is that it works fine for a while, but eventually it stops working and just sits there getting "421 Too many connections (8) from this IP". I opened TCPview to see how many connections there really were, and it seems like the filezilla process only has 3 connections open on port 21. However, the "System Process" has tons of connections open on port 21, with more being opened all the time. I've attached a screenshot of what this looks like.
When I first start transferring files, I can see that Filezilla has 4 port 21 connections open and keeps opening/closing the data connections on random ports (max 4 at a time). However, eventually the "System Process" starts opening up port 21 connections, very slowly. Once they open, they stay for a long while (5-10 minutes?) then eventually time out and close. Is filezilla causing these System Process FTP connections? What else could be causing them? I've killed all other processes except system process/services, and nothing obvious remains to cause these.
Update... I was just monitoring the file transfer behavior, and noticed something. If I limit the connections to 8 and the transfers to 4, it works for a while. If I up the transfers to 5, eventually it gets a "Too many connections", and that's when the System Process connection shows up. Every time filezilla tries to reconnect and fails, a System Process connection is made. Any ideas why this is happening?