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Windows IIS FTP sometimes not connecting to linux ftp client

it flag

I have Windows IIS FTP (local internet provider) and Linux FTP client (datacenter).

On server side port 21 is open on firewalls (windows firewall, router).

On client side firewall is off.

Connection is in ACTIVE mode.

Client connects to IIS and usually everything is ok, but sometimes client opens port (I have checked with netstat) but server is not connecting. I can connect to that port on client side from other (than FTP server) locations with telnet and I'm receiving data that ftp server should receive if it could connect.

The question is: what is going on?

I guess some ports are blocked somewhere. Internet provider on server side?

Lex Li avatar
vn flag
It is too early to say "server is not connecting", as who knows if it was trying to connect but blocked by something else on the wire. You will have to start from IIS FTP log files to see what was recorded then. Besides, capture network packets on both sides when the issue happens again and that might reveal more about the culprit.
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