I'm Stumped......

yoby

yoby

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Dave
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There's a shop (skyblueleisure.co.uk) that I can get to on every PC in the house except my laptop which just displays page not found errors in Firefox, Opera and IE. I can browse every other site, except this one, and as mentioned, can get to it on other machines on the network so I know it's not blocked at the router, or ISP.

I've checked the hosts file and there's nothing in it that would relate to this site
I've checked with the firewall on and off.
I've found the IP address of the host and get responses to pings.
There are no errors displayed in Firefox Error console
Checked that all machines tcp/ip settings are the same for this network - All use same gateway (which means they all go throught the same isp proxy and gateway i think)

All I get is an "Address not found" error

Not the end of the world, but this is the laptop I use all the time as it's the only one with a battery that lasts more than 10 minutes :) and I don't like not knowing why it's doing it.

Appreciate it if anyone else has some suggestions for anything I've missed, or something else I can try.

Cheers

(Oh and it's not a photography/camera related shop !!!)

Cheers
Dave
 
I knew I'd not tried something, but brain not working !!! I'll try that now....

Cleared cache, authenticated sessions, cookies and history - Still not working in Firefox, IE next.......

Nope not working in IE Either, or Opera

*/Bangs Head against wall for inspiration/* - There's got to be something on this PC blocking the IP address of the host somewhere, but can't think where else to look.
 
Just the crappy Windows one (should have mentioned that it's running XP Pro). The other machines that do worl are a mixture of XP Home, XP Pro and Vista, some have Zone Alarm, some have just Windows.

It's a work machine, so adding additional software isn't encouraged (albeit not forbidden).
 
If you "ping www.skyblueleisure.co.uk" from all computers do you get the same IP address coming back from each? I get 213.249.156.220.
 
Can I point something out please?

You are defaulting the website with WWW, arent you?

If you hit: skyblueleisure.co.uk in the URL of firefox it returnes nothing if you hit http://www.skyblueleisure.co.uk it brings the site up for me.


(I'm on FF)
 
... if you plug the machine straight into the modem (not the router) is it the same?

open a command prompt and type the codes below: pressing return at the end of each line. Reboot the machine and the router in turn..

i.e. shut everything off
turn on modem, waut 1 min, turn on router, wait 1 min, turn on machine.. and re-try


command prompt start/run... type CMD then return

ipconfig /release
ipconfig /flushdns
ipconfig /renew
netsh int ip reset
regsvr32 softpub.dll
netsh int ip reset resetlog.txt
netsh winsock reset catalog
netsh interface ip delete arpcache
 
Biggz said:
If you "ping www.skyblueleisure.co.uk" from all computers do you get the same IP address coming back from each? I get 213.249.156.220.
Click to expand...

That's the same one I get for all the PC's that work - However, the Laptop that can't find it returns nothing.

gazedd said:
Can I point something out please?

You are defaulting the website with WWW, arent you?

If you hit: skyblueleisure.co.uk in the URL of firefox it returnes nothing if you hit http://www.skyblueleisure.co.uk it brings the site up for me.


(I'm on FF)
Click to expand...

Yup, tried it both ways and still doesn't find it

gazedd said:
also check Proxy settings
Click to expand...

They''re the same on all machines on this network.

Richard King said:
... if you plug the machine straight into the modem (not the router) is it the same?

open a command prompt and type the codes below: pressing return at the end of each line. Reboot the machine and the router in turn..

i.e. shut everything off
turn on modem, waut 1 min, turn on router, wait 1 min, turn on machine.. and re-try


command prompt start/run... type CMD then return

ipconfig /release
ipconfig /flushdns
ipconfig /renew
netsh int ip reset
regsvr32 softpub.dll
netsh int ip reset resetlog.txt
netsh winsock reset catalog
netsh interface ip delete arpcache
Click to expand...

I'm going to give this a go, but I have a combined modem/router.. I'll let you know how it goes

Thanks for the suggestions guys
 
As it's a work machine maybe someone has added some form blocking software, that may may have this as a "prohibited" site?
 
nslookup www.skyblueleisure.co.uk

see which dns server is being used and what it is returning. Possibly a work machine is using a specific dns host which isnt resolving this site.
 
Right,
Tried the script above, which did it's thing and not made any difference.

As far as blocking software goes, I've had a proper root around and can't find anything, which tbh wasn't a surprise as the firm isn't that sophisticated at this time relying on a proxy server on the office network to log, monitor, and block sites. This is a bit hit and miss, and they've had limited success with basic site blocking on office firewall (for example, Facebook is supposed to be blocked across the company, but you can still get to it if you log on and are allocated a range of IP addresses they forgot to include in the rule).

It's annoying me that much that I may well end up rebuilding this machine !!!
 
who? said:
nslookup www.skyblueleisure.co.uk

see which dns server is being used and what it is returning. Possibly a work machine is using a specific dns host which isnt resolving this site.
Click to expand...

:agree:

This is the way forward - it's almost certainly a DNS issue. Run an ipconfig on a PC that works and the non-working laptop and compare the DNS servers. I suspect the working units default the DNS server to the router, where as the laptop is looking elsewhere.
 
yoby said:
I knew I'd not tried something, but brain not working !!! I'll try that now....

Cleared cache, authenticated sessions, cookies and history - Still not working in Firefox, IE next.......

Nope not working in IE Either, or Opera

*/Bangs Head against wall for inspiration/* - There's got to be something on this PC blocking the IP address of the host somewhere, but can't think where else to look.
Click to expand...

Try going into IE/Tools/Internet Options/Security and check whether it is in the Restricted Sites list.
If it is then take it out.
If you installed the other browsers after IE they may have adopted IE's settings. If so that may explain why they are all behaving the same way.
 
Richard King said:
Try it in safemode with networking next
Click to expand...

Nope - Still no worky in Safe mode......
Furtim said:
:agree:

This is the way forward - it's almost certainly a DNS issue. Run an ipconfig on a PC that works and the non-working laptop and compare the DNS servers. I suspect the working units default the DNS server to the router, where as the laptop is looking elsewhere.
Click to expand...

Could well be, and will be trying this when I get home this evening (can't try it at work at the moment)

arclight said:
Try going into IE/Tools/Internet Options/Security and check whether it is in the Restricted Sites list.
If it is then take it out.
If you installed the other browsers after IE they may have adopted IE's settings. If so that may explain why they are all behaving the same way.
Click to expand...

Tried this - and I have no restricted sites at all....

Arrrgghhh....
 
If it can't resolve the name with a ping, then it's not going to find it in IE, so we can rule out IE as the problem. Plus, if it's not working on multiple browsers, then again the problem is not with them

If you do ipconfig /all what are your DNS servers?

And what are they from a working machine?

If it's a work machine then iot may have specified DNS servers, rather than the ones you pick up from the DHCP server.
 
Furtim said:
:agree:

This is the way forward - it's almost certainly a DNS issue. Run an ipconfig on a PC that works and the non-working laptop and compare the DNS servers. I suspect the working units default the DNS server to the router, where as the laptop is looking elsewhere.
Click to expand...

I managed to find some spare "me" time......

PC next to my desk uses the same DNS server as the laptop. Only difference I can see is that the laptop has a couple of extra adaptors which look to be IPv6 to 4 "pseudo" interfaces - Got one which has a Gateway defined as 2002:c058:6301 blah blah.

Wondering now if this might be interfering.......

Also tried a tracert to try and see where it falls over........

Working machines get there through the same route, Laptop doesn't get past the DNS (well it does, it just times out) on either the Home or Office network....

Really irritated now as I really have (I think tried most if not all of the obvious potential causes).
 
tbh, because you are not posting anything specific in the way of detail, I'm not sure where you stand.

As I understand it:
1: you cannot access the site by name using web or ping.
2: you can access the site by IP using ping (and web browser??)

That implies DNS to me. If the dns server resolved the name correctly then your ping by name would work.

The DNS resolution request happens before an attempt to access the remote site.

tracert wont always give meaningful answers.

try looking at the route command - sorry I have no idea about options etc for that under windows - but that will show which gateways your laptop is trying to use to get to that machine.
 
it sounds like a problem with the router and that mac address/ip of your laptop. Check if there are any obscure rules setup on the router. Also in a cmd prompt do a 'route print' look for any static routes that may be causing problems (not that you would have set one up :-) )

If the laptop cant get past the router with a tracert then it looks like a router issue.

How are you connecting via wireless or ethernet cable ? Does the same result happen if you connect via either wireless or ethernet cable ?

Just wanted to add that I dont think it will be a DNS issue as stated above because your laptop can get to others site apart from this one, it will be using the same DNS severs for the websites it successfully gets to, the problem seems more local to me. Most of the time your network adaptors will be setup as DHCP which means ti will be given an IP address and with that comes all the other information for the subnet DNS and default gateway. If you router is the Default Gateway (which it more that likely is) then the router will the DNS request to your ISP and its DNS servers. Becasue your laptop can successfully get to other websites then we know that DNS is working.

From the information given it could be a few things....

Static route
Rule on the firewall
Issue with the network connection you are using (wireless or ethernet cable)
Maybe malware/virus

That's all I can think of at the moment.
 
who? said:
tbh, because you are not posting anything specific in the way of detail, I'm not sure where you stand.

As I understand it:
1: you cannot access the site by name using web or ping.
2: you can access the site by IP using ping (and web browser??)

That implies DNS to me. If the dns server resolved the name correctly then your ping by name would work.

The DNS resolution request happens before an attempt to access the remote site.

tracert wont always give meaningful answers.

try looking at the route command - sorry I have no idea about options etc for that under windows - but that will show which gateways your laptop is trying to use to get to that machine.
Click to expand...

Sorry - Trying to be as detailed as I can......

1) Home Network
All machines except this laptop can access site by IP or Name in any Browser

All Machines except this Laptop can ping site by name or ip address

All machines including this laptop use same DNS and Gateway

Issues ruled out are:-


  • DNS - All use the same
  • Router - All use the same
  • Static IP address / Gateway / Routing - All served by DCHP Server
  • Firewall -Turned off
  • Proxy Settings - Not set (i.e no proxy) on any of the machines.
  • No sites restricted.
2) Office Network

All machines except this laptop can access site by IP address or Name via Browser

All machines except this laptop can ping this site via IP address or Name.

Tracert gets to this site on all machines except this laptop.

All Office machines go via the same DNS server.

All office machines go via the same proxy server (note that this site cannot be accessed by this laptop when routed through the proxy server, or when proxy server bypassed).

​
I don't think it's a DNS issue as this site can't be accessed on this machine, irrespective of the network or DNS. I've sifted through the registry and there's nothing in there for either the IP address or the name of the site. This is why I initially thought it might have somehow been included as a bogey line in the Hosts File somewhere.

As far as Policy restrictions are concerned, when in the office all restricted sites, rules and logs are against the proxy server, not individual machines. Additionally, there's no reason this site would be blocked (OK it's on a couple of mail blacklists but as mentioned previously the office isn't that sophisticated).

At home, there aren't any policies or restrictions as I've (temporarily) disabled all of them.

I appreciate all the help and suggestions, but can't see how it can be a DNS issue if all the other machines that go through the same DNS Server can connect OK. Agree it's more fundamental than an issue with Browser(s) as all other sites are OK, on this as well as other machines.

As mentioned at the beginning of this thread, it's certainly not life or death, it's just annoying me that I have thus far, got no explanation for this site not working. It's probably something really simple, but nonetheless it's annoying for the simple fact that I don't know why.

If I can provide any more information that would assist anyone more knowledgeable about these things than I am then please ask, and I'll do my best to provide it.





​
 
HCK said:
it sounds like a problem with the router and that mac address/ip of your laptop. Check if there are any obscure rules setup on the router. Also in a cmd prompt do a 'route print' look for any static routes that may be causing problems (not that you would have set one up :-) )

If the laptop cant get past the router with a tracert then it looks like a router issue.

How are you connecting via wireless or ethernet cable ? Does the same result happen if you connect via either wireless or ethernet cable ?

Just wanted to add that I dont think it will be a DNS issue as stated above because your laptop can get to others site apart from this one, it will be using the same DNS severs for the websites it successfully gets to, the problem seems more local to me. Most of the time your network adaptors will be setup as DHCP which means ti will be given an IP address and with that comes all the other information for the subnet DNS and default gateway. If you router is the Default Gateway (which it more that likely is) then the router will the DNS request to your ISP and its DNS servers. Becasue your laptop can successfully get to other websites then we know that DNS is working.

From the information given it could be a few things....

Static route
Rule on the firewall
Issue with the network connection you are using (wireless or ethernet cable)
Maybe malware/virus

That's all I can think of at the moment.
Click to expand...

It's the same irrespective of whether I'm at home (simple Modem/Router, Wireless or cabled) and work, medium sized LAN, DMZ, Proxy and dedicated DNS server.

The only static route on the router at home is the Xbox Connection, other than that it's pretty much a DCHP free for all.

Laptop has different MAC addresses for network card and wireless adapter - Both have same problem.

Tracert gets out to any other site except the skyblueleisure one on this laptop on the work network (and assuming will be the same at home), and other machines on the network can tracert to this site, using the same DNS and proxy settings.

The firewall on the Laptop is off so all network traffic goes through the main one. Other PC's are fine so not sure how the firewall would affect just one machine (which incidentally rarely has the same IP address from dat to day).

I also thought virus. Scanned with Symantec (work one), spybot, adaware, and then cleared out all unnecessary items from the Hijack this logs. None of which has made a difference.

The only difference I can see at the moment are a couple of extra pseudo network adaptors, which look (to my untrained eye) like they're something to do with IPv6 translation to IPv4 and vice verse.

Is there any more detail I can provide that would help?
 
What DNS settings are configured for the problem laptop in network settings? Is it set to obtain the DNS server automatically, if not what server is it using?
 
OK great - so some service/software/firewall/proxy is blocking port 80 requests to this host then.

Are there any integrity clients / 3rd party software apps running in the taskbar that have been installed by your employer?
 
LeeP said:
OK great - so some service/software/firewall/proxy is blocking port 80 requests to this host then.

Are there any integrity clients / 3rd party software apps running in the taskbar that have been installed by your employer?
Click to expand...

Sorry about that - Just re-booted again. No, there's nothing (other than the symantec AV they've installed, just all my stuff.

I think though I know what it is - There's a protocol on this Laptop on this network connection for IPv6 TCP/IP, which isn't on any of my other working test machines. I was unable to check the properties of this (button was disabled) so I uninstalled it instead.

After a re-boot tried Skyblueleisure again and hey presto, happy browsing. Not at all sure where this protocol came from (Windows updates?) but assume that the host of the site has an issue with an IPv6 record somewhere that was corrupting/blocking/interfering with my requests.......


Thanks for all your help on this - I'm not mad after all......

*/waits to see what's stopped working due to the absence of IPv6*/
 
IPV6 hasn't been rolled out in production on the internet yet.
Certainly the machine I type this message to you on has it enabled as I run labs on the network here for real-life scenarios. I cannot see why it was trying to tunnel through ipv6 to this one host address.

The main thing is you're sorted. Very strange how you could ping it, but not connect on port 80. Which almost certainly pointed to an application issue (IP being lower down the OSI model which appeared to be working fine).

Lee :)
 
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