Can't open data connection problem.

[LundeSDK]

Hey.

I have been running ioFTPD a couple of months now, and in the last week it start acting very weird. Sometimes it just crashes, and the only way to get it up working again, is to restart it.

When users try to connect, they get this error:

[2] 150 Opening ASCII mode data connection for directory listing using SSL/TLS.
[2] Can't open data connection

I can't find anything in the logs, so I really hope somebody can help me.


Regards.

Lunde.

[ArtX]

Are they using filezilla as ftp client? - as i am getting some issues with ioFTPD and filezilla, and all the devs of that tool are saying is that ioftpd is broken.

So no help there

[Yil]

There's a whole range of potential problems. It could be the dreaded lockup bug which you can confirm it isn't by seeing if site shutdown [now] works. If that works in under 2 minutes (there is a grace period) then it's not the lockup bug. You could try site crashnow as well and that should be instant but will generate a dumpfile. After ruling that out, you need to look at the passive port range and make sure you are forwarding/allowing all of it in the router/firewall if you have one. I've seen similar behavior when only part of the port range is forwarded. Things work fine for a while and then you get into the non-forwarded range and things timeout.