Ubuntu Networking :: Can't Access External Sites
Sep 1, 2011
Strangest thing...yesterday my 11.04 box lost the ability to access anything external. I can ssh to the box from outside my network, and all other boxes on my network are fine, but this one box can't hit anything external. If I attempt to ping a site it's doing the same resolution, but no packets are delivered.
Up until yesterday it was running fine, and I didn't make any changes to my home network or install any updates. Totally stumped.
Edit: this is a wired connection with a static internal IP.
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Dec 31, 2010
I managed to configure my W890i phone to get access to internet through an ubuntu-based computer. It's very easy to use the phone to give internet access to the computer, but the opposite is quite more tricky. For that I've done the following
----On the phone---
-Set the USB network option to "through computer", so that the phone uses the computer's internet connection and not the opposite.
-Decide and set "Shared Network" parameters: user, pasword and workgroup.
-In "conectivity-> internet connection" set "allow local network" to "yes"
----On Ubuntu 10.04---
-Install samba, samba-client, smbfs, smbclient, firestarter and dhcp3-server
-Configure Samba (System-> Administration-> Shared folders): same workgroup as in the phone, add new user (the phone), passwd this new user. In my case the user was called "w890i" and the password given was the same.
-Once the phone is connected to the computer through USB (then select "phone mode"), a new connection appears in NetworkManager: usb0.The aim is to create a shared network that gives internet access to this device. Edit the IPv4 parameters of this new connection, set them to Manual and give an IP adress (192.168.0.1) and a subnet mask (255.255.255.0); the rest of the fields are left empty.Connect this network.
-Set firestarter to use dhcp3: sudo ln -sf /etc/init.d/dhcp3-server /etc/init.d/dhcpd
-Launch firestarter and follow the wizard. Set "allow internet shared connection", choose the device for the primary internet access, and then the device for the shared network (usb0). Then change the settings for firestarter: activate DHCP for local network, set IP to the one we gave before (192.168.0.1).
-Open dhcp3-server config file sudo gedit /etc/default/dhcp3-server And set INTERFACES="usb0"
-Set the policies of firestarter: in incoming connections, allow connections from the IP adress given to the phone (192.168.0.1). Then add rules for the ports that need to be open for this connection. I opened HTTP, HTTPS, SMB, SMTP, POP3, IMAP, IMAPS, DHCP for all the connections in the local network.
-Apply policies and start the firewall.
------------
After all this, the phone can access the internet through the computer. Two problems appeared:
1. I couldn't get access to https sites, like webmails. The phone gave a "communication error". But then I tried with Opera instead of the browser built in the phone's firmware, and I could finally get to https sites.
2. I couldn't retrieve mail, neither POP nor IMAP nor IMAPS. I thought it was a firmware problem again, and I tried out several mobile phone email clients written in java, but none of them worked.
So this is at the moment the problem. If I connect from the phone to the internet directly through 3G, the email clients work for all my accounts. I don't think it's a firewall problem, because the ports are opened for this connection
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Apr 12, 2010
Have just installed Ubuntu 9.10 in Vmware workstation 6.5.1 and unable to connect to external sites, or servers (using NAT). I can ping on host name and IP but can't resolve either host or IP in browser (Receive message the connection has timed out). I can't ping the host (Windows 7 Professional) IP from the guest and vice versa. I use a mobile wireless network card, and my Windows operating systems work successfully in vmware. Currently in my VMNet8 properties I just have Obtain IP address and DNS Automatically (same as host).
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Jul 8, 2011
I'm on Ubuntu 11.04 and have wired internet connection.
Some sites (particularly https) take very long time to load . Sometimes I get "Page is taking a long time to load . Reload the page later" message.
Now , this is happening for some http webpages also.
This is not a problem with browser.
I have firefox , chrome , chromium and konqueror installed.
Also I can access all these sites properly from windows so it is not problem with my internet connection either.
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I can access ....., and watch vids and perform searches on google, bing, yahoo and the like. However when i try and access a site that i have searched for it takes me to the internet providers homescreen and tells me to activate my account or top up my account.
I know i have enough GB left as i recently activated my account and i'm able to use the wireless stick on another computer without any problems on all websites. So this leads me to believe that there is maybe a problem with my browser or security settings, but im not sure what to do.
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Jan 14, 2011
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Jun 2, 2010
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May 29, 2010
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Dec 23, 2010
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I guess that for other cases, like bank sites and others, they opened the 443 port too. But other ports are all closed.
I set up a linux server at home, and I need to access it with SSH. However, I can't access my server directly by its IP number,
I don't know why, but probably it's because some rule in the company's firewall or proxy, right? What I did to trick this was create an account on NO-IP.org, which provides me with a DNS to my host. In this moment, my "network" is something like this:
When I try to connect (by my work PC) with "telnet xxxxx.no-ip.org 80", or with Putty, I get a blank screen, no errors, no nothing.
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But is there a way to do this?
It would be something like this:
Is that correct?
If so, how could I do this?
I'm trying for a week now, with programs like http-tunnel, proxy-tunnel, and others. But nothing until now.
So, any ideias how could I could communicate my SSH client at work over a HTTP (port 80) connection, over NO-IP, my modem, my server, HTTP to SSH, and finally my SSH server?
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Dec 12, 2010
I have a VPS - and I was trying to install gd support for php on to it. Once I had done this I had a 500 Server Error. With the following errors in the log
[Sun Dec 12 07:34:29 2010] [error] [client 2.125.204.56] SoftException in Application.cpp:574: Could not execute script "/home/perfectp/public_html/phptest.php"
[Sun Dec 12 07:34:29 2010] [error] [client 2.125.204.56] Caused by SystemException in API_Linux.cpp:444: execve() for program "/usr/bin/php" failed: No such file or directory
[Code].....
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Apr 8, 2010
How to add parental control like { block web site access, restricting login access for particular time, restrict web access} for particular user accounts in Linux.
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Mar 30, 2011
i have a website named [URL]... now i want to access this website using proxy server(squid,or etc...) under my personal server named [URL]...means that [URL]...
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May 19, 2010
i just implemented ur instruction n got success but i have one problem that i want to provide only two or three web sites access to groups in squid.
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Oct 7, 2010
I installed Apache2 and I added a second virtual host, now can i separate the 2 hosts and let them access 2 different internal test sites? For Example lets say"
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Mar 9, 2011
I'd like to ask a question on installing software.
I cannot install software using "yum" but I can with the GUI program "Add/Remove Software".
For example, I tried:
It will exhaust all the mirror sites without success.
All the error messages look like:
But I can install "screen.i686" easily from the "Add/Remove Software" GUI and it is very fast.
However, what's puzzling is that I could install some certain packages although I still see the same kind of error messages.
For example,
will work. But in general, "yum" is running very slow and is rejected at every mirror sites.
My settings: I just installed "Fedora 14" (Linux 2.6.35.11-83.fc14.i686) as a virtual machine (using VirtualBox) on a Windows XP (Professional, SP3) host on my laptop (CPU: Intel Core2 Duo), which accesses internet through a HTTP Proxy server since it is behind a corporate firewall.
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Mar 5, 2011
Is there a modern equivalent of "Expect", which was developed for the UNIX environment to automate access to programs which had been designed to interact only with a human?
Now with many facilities only accessible by HTML and javascript, what solutions are there to access such websites from a Perl script for example?
The need to access interactive systems by automated agents is the same now as when Don Libes originally wrote Expect, described well in his paper to the Summer 1990 Usenix Conference, Expect: Curing Those Uncontrollable Fits of Interaction.
I want my computer to access the web - I don't believe I should have to be chained to it by mouse and keyboard before it can interact with web sites. Surely there are some tools for achieving this. I've searched, but haven't been able to find any. Although I'd like to do it from a Perl script, I'd consider any language: C, PHP, anything.
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Feb 9, 2011
In the past week or so I've noticed some weird network behaviour. I find accessing some sites such as Amazon, Paypal, and Bigstockphoto really slow. Sometimes the page will not load at all. Other sites are fine. The problem sites are not a problem for others on my LAN at home. When I try to open the problem sites, I can see in Firestarter blocked connections coming from 2.1(8/9).xxx.xxx on various ports such as 36007. This only happens for the problem sites. I attached a typical output from firestarter.
This happens with Firfeox or Chrome. Using Ubuntu 10.10
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Mar 15, 2010
I am running Ubuntu 9.04 32bit on a dual boot (XP) computer. No internet problems in windows, and I am currently typing this post on my wifes HP laptop running 9.10. I have no browsing ability on the desktop running 9.04, and updates don't work (in details, every other line fails) But, I can bring up Google, and search it, pictures and all, but cannot go to different sites (ebay, hotmail, amazon as the first few i try). Also, my pidgin works fine, as I am talking on it now. I have tried to turn off ipv6 in Firefox and ubuntu, neither doing anything noticeable.
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Mar 15, 2010
Its a single PC, I can ping my connection but I cant able to browse any sites..These are my outputs.
Code:
karthick@Learners-desktop:~$ ping -c 3 google.com
PING google.com (209.85.231.104) 56(84) bytes of data.
64 bytes from maa03s01-in-f104.1e100.net (209.85.231.104): icmp_seq=1 ttl=45 time=355 ms
64 bytes from maa03s01-in-f104.1e100.net (209.85.231.104): icmp_seq=2 ttl=45 time=355 ms
--- google.com ping statistics ---
3 packets transmitted, 2 received, 33% packet loss, time 2000ms
rtt min/avg/max/mdev = 355.239/355.534/355.830/0.665 ms
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Nov 9, 2010
For a while now I've got a problem when surfing the internet. Everythings fine for let's say 15 minutes and then all of a sudden it takes about 1 minute to load a -random- page, once it has loaded, everthing's fine again. Transmission does not seem to have this problem. I'll double check this. Looking thru the forum I found the following "solutions". None of which has worked for me up to now:
- disable ipv6 in firefox
- set method under network manager to "Automatic (DHCP) addresses only" and use google or OpenDNS dns servers
- change resolv.conf (comparable to the second one I guess)
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Jan 10, 2010
With hardy, I was able to have multiple SSL sites on the one machine. But I can't seem to get it to work for ubuntu 9.10, I've read that you need to put each SSL site on a different IP. But I was able to do it with hardy without different IP's.
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Feb 2, 2009
I have an odd Linux problem. Changed ISP recently -- Windows NT4 & W95 work fine. Linux has worked fine on previous ISPs, but on the newest ISP, I can connect successfully on Linux, but can only communicate w/maybe one out of 10 sites (Google, for ex.). Mostly I get "cannot connect to site". Some points:
-Linux is Slackware w/kernel build 2.4.26.
-No settings changed from Linux setup that worked fine on previous ISPs.
-/var/log/Log file says PPP connects via CHAP successfully & no problems..
-I don't see any similarity on the few sites I can connect to -- seems random.
-ISP is useless -- say they "don't support Linux".
-Using Firefox & Konqueror browsers.
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Jul 18, 2011
I need to block some websites and torrents on my LAN running on mostly WIndows XP pcs and a Windows 2008 domain controller. It's possible to block some sites using DNS in Windows Domain controller, but users have the rights to change DNS and bypass the rule. Editing HOSTS file doesn't workThen I tried using Avast antivirus Site Block feature, but that doesn't work on any browser except Mozilla. We have to use Epic and Mozilla Firefox.We can't use a dedicated hardware firewall due to budget constraints and the fact that we have multiple ADSL lines for internet. No single gateway.
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