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Old 08.09.2008, 17:09
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Swisscom Port Blocking?

I noticed that since I got internet service over ADSL from Swisscom, I've not been able to do anything with FTP. I can't download knoppix (linux), I can't connect to an FTP server hosted by a friend, and I can't send pictures/videos to family and friends over FTP. I've tried the standard port 21 as well as some ports in the 50xxx range. Has anyone had similar experiences? I've also noticed an awful lot of tcp resets when viewing connection data over wireshark (protocol analyser/packet sniffer). Did I miss something in the terms of service? Does anyone with Cablecom or another provider have issues with ports, resets, or blocked services?

I have a feeling that it could be the ADSL modem they provided me. It seems to want to blow out my settings as soon as it trains up to make a connection with the upstream server, but I'd rather not buy another ADSL modem if that's not the problem.

Any thoughts/experiences would be much appreciated.

I should probably also mention that I'm an IT guy and I've probably taken care of the basic firewall/router issues, but it's always possible that I overlooked something.

Thanks!
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Old 08.09.2008, 17:18
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Re: Swisscom Port Blocking?

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I noticed that since I got internet service over ADSL from Swisscom, I've not been able to do anything with FTP. I can't download knoppix (linux), I can't connect to an FTP server hosted by a friend, and I can't send pictures/videos to family and friends over FTP. I've tried the standard port 21 as well as some ports in the 50xxx range. Has anyone had similar experiences? I've also noticed an awful lot of tcp resets when viewing connection data over wireshark (protocol analyser/packet sniffer). Did I miss something in the terms of service? Does anyone with Cablecom or another provider have issues with ports, resets, or blocked services?

I have a feeling that it could be the ADSL modem they provided me. It seems to want to blow out my settings as soon as it trains up to make a connection with the upstream server, but I'd rather not buy another ADSL modem if that's not the problem.

Any thoughts/experiences would be much appreciated.

I should probably also mention that I'm an IT guy and I've probably taken care of the basic firewall/router issues, but it's always possible that I overlooked something.

Thanks!
Weird coincidence, I downloaded Knoppix last night via ftp on a Swisscom connection. A lot of the mirrors are a bit flaky though, try speedline.de (i think that's what it was called)
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Old 08.09.2008, 17:50
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Re: Swisscom Port Blocking?

I just tried a few different mirrors and none came up.

But then I tried a proxy to the US on my friend's computer and it came up just fine. The knoppix linux mirror site was:
ftp://ftp.gwdg.de/pub/linux/knoppix/

I find it rather strange that I can get it through the proxy but not with a direct connection. I'll have to think about why that could be... but if anyone want's to help please try that ftp mirror from a Swisscom connection.

Somehow I still think something is wierd with my DSL modem. They gave me an SMC model #SMCA1T-A modem when I signed up for the service. What type of modem are you using?
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Old 08.09.2008, 17:53
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Re: Swisscom Port Blocking?

I'm using my own linksys one, will try the link when I get home, currently stuck in mega delay at HB
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Old 08.09.2008, 18:15
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Re: Swisscom Port Blocking?

For a min I thought it was an ad blocking program of mine called "Ad Muncher", but it turned out not to be (I forgot I was still using the proxy).

Last edited by the traveler; 08.09.2008 at 18:26.
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Old 08.09.2008, 20:19
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Re: Swisscom Port Blocking?

that mirror works for me:
ftp://ftp.gwdg.de/pub/linux/knoppix/...7-01-04-EN.iso
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Old 09.09.2008, 08:47
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Re: Swisscom Port Blocking?

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They gave me an SMC model #SMCA1T-A modem when I signed up for the service. What type of modem are you using?
The SMC is a new modem Swisscom is offering. I've seen it offered only with their "low end" ADSL subscriptions ("DSL Start", "DSL Mini"). Some ideas could be:

1-Maybe they block FTP for low-end subscribers? (I doubt it, but just a thought)

2-Maybe since the modem is a new device in their inventory, there are some problems with it?

3- You say when it connects it wants to "blow out your settings". What do you mean? Actually, on my Swisscom Netopia/Motorola router the firmware is automatically updated by Swisscom, along with other settings. It seems they are taking more control of the router. Maybe Swisscom detects some different setting you made in your modem and resets it to their settings?

Having said all that, my Netopia router allows FTP and all other connections with no problems. Maybe try another computer on your modem to see if it's something on your PC or if it's actually a problem with the modem.
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Old 09.09.2008, 09:19
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Re: Swisscom Port Blocking?

Have you tried just to reset it? I had so many issues with my old ADSL netopia modem/router that were only solved by resetting it once in a while.
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Old 10.09.2008, 15:46
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Re: Swisscom Port Blocking?

Yeah, after poking around in it for a while and completely hosing my connection I did a factory reset and it started working again, this time with knoppix download support

Connections are still rather strange on it though. I somehow managed to get to an ftp site of a friend, but only after setting it to pasv even though both sides had multiple ports open. I also noticed that canyouseeme.org can't connect to my ftp server on any port (tried hosting ftp server on various well known ports).

I guess that's what I get for accepting a "complementary" modem...

Anybody have any experience with the digital phone line version of the ADSL package? It's supposed to be 8-20mbps down and 1000kbps up. Cablecom sounds better with 25mbps down and 2500kbps up, but then again, cable is shared bandwidth.

Anybody compare the two?
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Old 09.09.2008, 09:13
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Re: Swisscom Port Blocking?

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I noticed that since I got internet service over ADSL from Swisscom, I've not been able to do anything with FTP. I can't download knoppix (linux),
I also have ADSL from Swisscom and have no problems downloading Knoppix from any of the following mirrors:

http://knopper.net/knoppix-mirrors/index-en.html
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