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Can FTP, cannot ping?

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7 replies

by cricket_moon

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I have a client sitting behind MS proxy 2.0. We are using SOCKs proxy to gain access to the internet. When I attempt to ping an externally addressed FTP server, I get Request Timed Out. But, when I FTP to the same IP address, I am successful. What the heck am I missing?!?

7 replies

by cricket_moon

How is this checked? I have access to both the Winsock proxy settings and the FTP server, so how do check this on both?

by cricket_moon

Everything that I am reading says that I cannot ping through MS proxy 2.0 Winsock proxy. Everything says that ICMP is a no go. Please, someone tell me that this is quite wrong, and tell me how to get around it, without giving my WSP clients outside IP addresses.

by mdavis

Ping's and FTP requests use different protocols within the TCP/IP stack. FTP uses either TCP or UDP to send its data between the client and server. Ping uses ICMP to send its data. Your firewall, or the firewall protecting the FTP server could beallowing the TCP or UDP packets through, allowing you to FTP to their server, while it's blocking the ICMP packets, which prevents you from pinging. Hope this explains it somewhat.

by cricket_moon

Actually. What I have found is that ICMP is blocked by MS Proxy. There is NO way to get around this. Bummer. But, we did find an alternative solution. Thanks!

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