Connection problems from inside LAN

Connection problems from inside LAN

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Subject Author Date
Connection problems from inside LAN Dan 05-16-2007
Posted by Dan on May 16, 2007, 4:27 pm
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Hi. I've got a server on my home computer (Subversion in this case -
but what server/port it is doesn't matter for this problem). My home
network just consists of an ADSL router, my computer, and my laptop.

I can connect to the server remotely no problem. If I try and connect
to the server from within the network (from either the laptop or the
computer which is running the server software), then I get ...

"No connection could be made because the target machine actively
refused it."

I can connect to the server from my main machine okay if I replace the
ip address with "localhost".

I've tried checking my logs on my router - and it's not reporting
anything going in or out of the LAN.
I've tried disabling all firewalls on my computer.
Nothing makes a difference.

Any ideas what's happening?

Cheers for any info,
- Dan


Posted by RedForeman on May 17, 2007, 4:44 pm
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> Hi. I've got a server on my home computer (Subversion in this case -
> but what server/port it is doesn't matter for this problem). My home
> network just consists of an ADSL router, my computer, and my laptop.
>
> I can connect to the server remotely no problem. If I try and connect
> to the server from within the network (from either the laptop or the
> computer which is running the server software), then I get ...
>
> "No connection could be made because the target machine actively
> refused it."
>
> I can connect to the server from my main machine okay if I replace the
> ip address with "localhost".
>
> I've tried checking my logs on my router - and it's not reporting
> anything going in or out of the LAN.
> I've tried disabling all firewalls on my computer.
> Nothing makes a difference.
>
> Any ideas what's happening?
>
> Cheers for any info,
> - Dan

sounds like a DNS issue to me...

RedForeman


Posted by Dan on May 22, 2007, 4:15 am
If you were  Registered and logged in, you could reply and use other advanced thread options
>
>
>
> > Hi. I've got a server on my home computer (Subversion in this case -
> > but what server/port it is doesn't matter for this problem). My home
> > network just consists of an ADSL router, my computer, and my laptop.
>
> > I can connect to the server remotely no problem. If I try and connect
> > to the server from within the network (from either the laptop or the
> > computer which is running the server software), then I get ...
>
> > "No connection could be made because the target machine actively
> > refused it."
>
> > I can connect to the server from my main machine okay if I replace the
> > ip address with "localhost".
>
> > I've tried checking my logs on my router - and it's not reporting
> > anything going in or out of the LAN.
> > I've tried disabling all firewalls on my computer.
> > Nothing makes a difference.
>
> > Any ideas what's happening?
>
> > Cheers for any info,
> > - Dan
>
> sounds like a DNS issue to me...


Are there any tests I can do to see if it is a DNS issue? Or any
ideas on what I can try to fix it?

Thanks again,
- Dan


Posted by RedForeman on May 22, 2007, 8:55 am
If you were  Registered and logged in, you could reply and use other advanced thread options
>
>
>
>
>
>
> > > Hi. I've got a server on my home computer (Subversion in this case -
> > > but what server/port it is doesn't matter for this problem). My home
> > > network just consists of an ADSL router, my computer, and my laptop.
>
> > > I can connect to the server remotely no problem. If I try and connect
> > > to the server from within the network (from either the laptop or the
> > > computer which is running the server software), then I get ...
>
> > > "No connection could be made because the target machine actively
> > > refused it."
>
> > > I can connect to the server from my main machine okay if I replace the
> > > ip address with "localhost".
>
> > > I've tried checking my logs on my router - and it's not reporting
> > > anything going in or out of the LAN.
> > > I've tried disabling all firewalls on my computer.
> > > Nothing makes a difference.
>
> > > Any ideas what's happening?
>
> > > Cheers for any info,
> > > - Dan
>
> > sounds like a DNS issue to me...
>
> Are there any tests I can do to see if it is a DNS issue? Or any
> ideas on what I can try to fix it?
>
> Thanks again,
> - Dan- Hide quoted text -
>
> - Show quoted text -

Well... not really tests, just document your settings and keep them
consistent...

if your DSL modem is doing DHCP, then leave it to do that....

typical settings
DSL Router Settings
WAN IP XXX.XXX.XXX.XXX
LAN IP 192.168.1.1
DHCP pool of 192.168.1.10-25
DNS - point to external DNS of ISP(call ISP and ask what DNS addresses
they use.)

Internal PCs should have IPs of 192.168.1.10-25, subnet 255.255.255.0,
gateway 192.168.1.1, DNS could be either your 192.168.1.1, or your
external DNS provided by your ISP.... Most Routers will have 2
entries for DNS... both should be external. Your internal clients
should use 1, the routers internal address(192.168.1.1) and 2, the
external address provided by your ISP....

RedForeman


Posted by Bit Twister on May 22, 2007, 9:38 am
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On 22 May 2007 01:15:13 -0700, Dan wrote:

> Are there any tests I can do to see if it is a DNS issue?

To prove it is a DNS issue, you first test connectivity by using the
ip address in place of the name. If you connect using ip address
and fail using the correct name, you know you have a DNS issue.

Of course it is a bit hard getting ip address when DNS is dead.
You might want to get some ip address for testing before you have a
dns outage.

It is also handy to have a third party to look up an ip address. Say
http://samspade.org/ http://www.webyield.net/domainquery.html
http://www.geektools.com/whois.php

Linux stores DNS resolver ip addresses in /etc/resolv.conf
Your ISP provides those addresses as part of a DHCP lease.

If you like you could add a third entry of a free Public DNS ip to
your list of DNS servers which gives you a fallback if the ISP's
servers fail.

Downside of keeping a hardcopy of ip addresses, is they might change.
You can solve that problem by having a batch/cron job check them and
mail you a message when it sees a change.

No knowledge of scripting language.
http://tldp.org/LDP/abs/html/index.html

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