ftp disconnects after logging into my network

aciddrops
aciddrops used Ask the Experts™
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Hi I have a adsl service shared by 4 computers.
One of the computer is acting as a ftp server, but when users logged into my ftp server they are immediately disconnected.  

My adsl modem is connect to my linksys router/switch.  I enable port forwarding for 20-30 to a static IP my ftp server is running.  The ftp server is bullet proof ftp server.  

What could be the problem?

Thanks
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Are the 'users' local to the LAN or from outside?

Harry

Author

Commented:
the users are external to my network.  
My guess is that your ADSL provider restricts this.  How are you handling dns?  I assume you can ftp from within the LAN OK.

Harry
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Author

Commented:
If i am using only the adls modem is works but when the router/switch is connected is screws everything up.  So i think i can rule out the provider.  What other reasons can there be?

tHANKS
Well if you can use FTP when the router isn't there, and you can't use it when it is, then its the firewall in the router.

Do you have the proper port forwarded to the right machine.  I think its Port 21?


Harry

Author

Commented:
i forwarded 20-30 but still problem.  What can drop a connection after the user logged into the ftp server?  There is no firewall on the router or the PC
Aren't you using a Linksys router??

HW

Author

Commented:
yes.  but i didn't not download the firewall.  So you think the firewall might be the problem?
What is the model number of the Linksys you are using.

HW

Author

Commented:
BEFSR41 is the linksys 4 port dsl router/switch.  There is an option for downloading of zonealarm but i didn't not.
Ok, I use a Linksys.  What is your Firmware Version?

Author

Commented:
1.42.7.

Commented:
You should only need tcp ports 20 and 21 for ftp. I reckon it's probably a config problem within the FTP software.

Try something else, I use MeteorFTP:

http://www.zdnet.com.au/downloads/pc/swinfo/0,2000036746,7998901,00.htm

I got fed up with various ftp servers I tried and settled with this one. I have a similar setup to you (NAT on router, forwarding 20&21)

Good luck
i figure out the problem.  i did not forward the passive port 50000 and 50100.  There is a good website documentating how to setup a ftp server  using behind a linksys router.

i think is www.linksysftp.org

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