Topic: Port 80 not available

[Paul Wolsink]

Hi Ken
I could be that your modem has Firewall capabilities and that it is somehow blocking port 80. On my standard Alcatel modem the firewall is off and no router configuration. With a hack you can enable it to act as a router although firewalling is still not available. Maybe with yours it is ?

The problem with me is that it only accasionally blocks the port and not always.

regards
Paul.

[Paul Wolsink]

Hi Tim
Well , this is a lead. I've got a feeling that this is not the case here as there are hours of def. non-activity where the port stays available (Every 5 minutes Netsaint does a check from an outside location to check availability) and sometimes users are using the system from inside the network outbound and then it stops as well. And why does it only stop on port 80 and 443? 980 works fine as well as 25,110,22.

But I do see one common item in those who responded and that is it seems all systems with this problem is using ADSL. SO it could well be related to ADSL modem, central routing equipment, etc.

I will be placing a netsaint on a system inside the network to send regular http requests outbound and see if that helps.

Just maybe your ISP is correct and that because ADSL is also used with a number of users in your area/street/exchange (contention rate of say 1:10) , that for a numer of hours someone else was browsing with whom you are sahring your ADSL line/exchange and kept the exchange equipment alive.

I will investigate this part a bit and see if it solves by sending the http requests every 5 minutes and by reading up about it. I also known a number of experts and will put the question out if there is something like this playing.....

Thanks for the info.

Regards
Paul

[ken]

> I could be that your modem has Firewall capabilities and that
> it is somehow blocking port 80. On my standard Alcatel modem
> the firewall is off and no router configuration. With a hack
> you can enable it to act as a router although firewalling is
> still not available. Maybe with yours it is ?
>
> The problem with me is that it only accasionally blocks the
> port and not always.

The d-link was on a home system which also has a static IP and on which I was experimenting with NT server, I then swapped it  the GVC one at work. The D-Link had been working to receive port 80 at home but now it does not work their either but only for port 80. The firmware must have corrupted.

This means your ADSL unit could be the culprit as well, or even a really bad cable. The only real test is to swap it with a different unit and see if the problem goes away, in conjunction with your testing.

Ken

[Paul]

Hi there

Latest on this topic.

I installed a RedHat v8 and it worked perfectly up to now. NO outages. Not a single minute.
That means that the problem is def. with SME v5.5
I will try SME 5.6 tonight. If the problem returns, then I will stay with RedHat. That will be a shame thou

regards
Paul

[Paul Wolsink]

Well, it appears the problem was with SME v5.5. I nstalled v5.6 (no updates) on  the same server and now did not get any port 80 problems. It worked like a charm for 24 hours with one outage.
I think the problem was with V5.5 IPCHAINS, but can't say for sure.

regards
Paul