Ubuntu Networking :: No Longer Connect To External Proxy Server?
Mar 2, 2010
I am running Jaunty 9.0.4. I have go through a proxy to get out to the net. It was working. Sometime yesterday it was unable to resolve the proxy server. Can't even ping it. Other computers can. I even switch cables to no avail. What could block the proxy server? I can't even ping google.com Was it something I installed through add/remove software? Has anyone seen something like this before and even better has a solution or can offer a way to troubleshoot this? I can ping myself and the default gateway server.
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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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Aug 4, 2010
Is there a way to connect to a samba share on the other side of a dynamic ssh tunnel?I like to use ssh -D 8080 <host> to access the network on the other side of a ssh session. For applications with their own proxy settings it seem to work really nice.In this particular case I'd like to use the 'Connect to server' feature in Ubuntu to connect a samba share through the tunnel, but I can't figure out how to make only that connecton use proxy settings.If I enforce system wide proxy settings the ssh tunnel will die, so that is not an option.
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Sep 12, 2010
Having a bit of an issue connecting to my apache2 server. I'm running Ubuntu Server 10.04lts. I can only connect to my website via ip address global, ip address local, and the dyndns domain I have linked to my ip address. I have DMZ setup for my server with a local static address of 192.168.1.100. I can only connect to the default apache page via lan, and It wont load when I try via proxy. I need to know how to configure my router (wndr3300) so that I can connect to my server (address 192.168.1.100) and the pages from outside of my network.
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Feb 12, 2011
I used windows OS and installed Ubuntu 10.04 (amd64) in separate partition and works well but had a problem in internet connectivity. Likely reason may be the proxy setting that we used in college (currently). I used this commands to set up the IP address and gateway.
ifconfig -a | grep eth
"eth0"
sudo ifconfig eth0 192.168.5.209 netmask 255.255.255.0
[code]....
Then I manually set the proxy setting of HTTP which is given as proxy server 192.168.5.2 and port as 8000, further more there is a wins setting which is 192.168.1.178, really don't know where to put this number.
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May 14, 2010
I am unable to connect to the Internet in lucid via a proxy server using apt-get or synaptic. Opera & firefox connects to the internet fine with the proxy setting.
I have tried the following solutions:
1) set proxy setting using systems|preferences|network proxy
2) editing ~/.bashrc & /etc/.bashrc
3) creating a /etc/apt/apt.conf file.
4) putting the proxy setting in synaptic
For the proxy setting I have used the both the verbose name as well as the ip address. There is no logon requirements for the proxy server. Either formats work in the browsers.
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May 16, 2010
I'm trying to set up a server for an NPO who connects to the Internet through an internal proxy (Websense). I can't access the Internet unless through the proxy.
Since it's a server I did not install a GUI so I'm wondering how to connect the new server to said proxy server. I have the IP address, port number and username-password for the proxy server. The new server has a static IP address and is ready too go!
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Oct 15, 2009
As the title suggest, I have downlaoded the latest copy of Ubuntu Server from the ubuntu website.Everything installed fine. DHCP configured ok as far as I can tell. I can ping other machines on my network (which are running Windows) and they can ping the Ubuntu machine and conenct to Apache which is running on it.If I try to ping google.com or any other domain, it gives the correct IP address but gives no response to any pings, dont telnet on port 80 (or any toher potr for that matter) on any machine on the internet. I checked the settings using ifconfig to see what DHCP had assigned, and they matched the windows machines configuration (other than the IP address obvisouly). I tried assigning a static IP, even reserving a particular IP for my NIC.
Whatever I do, i cant connect to any machine outside the network via IP or domain.I have searched everywhere and tried everything i can find on the net but still to no avail.The Windows machines are part of a domain called alcom-uk.local and run off of a Windows Small Business 2003 Server. Not sure if i need to manually setup Ubuntu to connect using a domain or anything.
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Dec 9, 2010
Currently my DHCP Server is working now what i want to have is auto detection of squid proxy in any browser but I still got an error in my dhcp server when I restart it.
My Config:
# DHCP configuration generated by Firestarter
ddns-update-style interim;
ignore client-updates;
[code]....
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Sep 18, 2010
I am trying to turn an old desktop that has slackware 12.2 installed on it into a dhcp server that performs nat on a certain range of the subnet... the server's hostname is nutshell. Once I have it set up, I am testing it with a slackware64-13.1 laptop whose hostname is firebolt. Nutshell has a static ip. Before messing with the DHCP side of things, I thought I would start with getting NAT working. The steps I have taken are as follows:
I modified the /etc/rc.d/rc.inet1.conf script so that the interfaces would be setup on boot. Eth0 has ISP's static ip assigned to it, and I assigned 172.0.0.1 to eth1. I opened the box as wide as possible, so that former firewalls and security settings would not interfere. The contents of /etc/hosts.allow is All:All, and /etc/hosts.deny is an empty file. The firewall is set to allow everything, i.e., iptables -L has "ACCEPT" as default policy on all chains. Next I used iptables to start nat with the command:
[code]...
I can ping external ips from firebolt, so the NAT appears to be working properly. I fire up x-windows and surf a little. While I am surfing it freezes. Checking the pings again, suddenly firebolt cannot ping isp's dns anymore. Checking on nutshell, it can no longer ping external ips either. However, after running /etc/rc.d/rc.inet1 restart on nutshell, all is well, and it is pinging out again. I go back to firebolt and resume my surfing.
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Jul 24, 2010
I have searched for this quite a bit but my lack of knowledge of IPTables makes me doubt whether I have found a solution or not. I have very light experience with IPTables as well.So I thought I'd ask here.Basically, what I am trying to do is use an external transparent proxy for only one of the hosts on my internal network. For example, for an internal host of 192.168.1.8, I want to send all internet requests for ANY port to a proxy server out in the internet at 238.34.232.7 / port: 8080. All other hosts would use the internet without using any proxy server.
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Jul 24, 2010
what I am trying to do is use an external transparent proxy for only one of the hosts on my internal network. For example, for an internal host of 192.168.1.8, I want to send all internet requests for ANY port to a proxy server out in the internet at 238.34.232.7 / port: 8080. All other hosts would use the internet without using any proxy server. Is IPTables the way to set this up or is there an easier option?
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Aug 17, 2010
I can ping a host on my LAN successfully, but I cannot ping [URL]... for example. I have disabled the firewall and set http_proxy and can browse the internet with "Use system proxy settings" checked in Firefox. I am unable to update with yum either, but I am not sure if this is a side effect or not. I have run a trace on my ip address as I am browsing the internet and I can see the sites I am visiting on our web appliance. However, if I try to ping or update no requests are hitting the proxy so I don't think that is the issue.
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Aug 3, 2011
I have setup a Squid Transparent Proxy that works and I can connect to most websites and block-list works and yadda yadda yadda.
My problem is that when I try to connect to a certain PC it will not work. A bit more clarity...
[INTERNET]----[DSL-MODEM]----[ROUTER]----[SQUIDSERVER]----[NETWORK]
Connected to the DSL-MODEM is the PC in question that I can't connect to when using Squid. If I bypass the Squid from the Network and go through the router I can connect to the PC.
I want to be able to use the Squid server and still access the PC connected to the Modem and I want to have a Squid SAR report of the Network PC's accessing the PC on the modem.
The Modem/Router/Squid/Network all use the same IP range, but the PC on the modem has a different IP.
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May 16, 2010
I can no longer connect to my network.Every ip on the 192.168.1.X range is for some reason pointing back to localhost.The machine is dual boot, I have no such issues with windows, it's just my ubuntu (lucid).
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Mar 8, 2011
Installing, reinstalling different distros, flavors, on dual-boot (XP), for almost year & 1/2.
Never problems with accessing internet. Ubuntu varients, Suse, mostly.
3 weeks ago, downloading new Mint ISO with bit-torrent. Did not complete the download.
Soon after this, abberrant behavior began - could no longer connect to internet. After exploring, appears that network is not enabled. Played with configuring / editing - seems to be correct - but still no more connection.
Several times wiped disk, reinstalled. Same behavior. AND Live CD works - always goes through (using it right now to access this site).
What condition could/would persist through various reinstallations, but not affect Live CD use?
Also in the network - Linksys router, vonnage phone. But no previous trouble.
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Feb 11, 2011
i tried to search for possible tweak in getting conkyForecast connect via proxy server. it connects and functions well when directly connected to internet (from home) but in office, i have to connect via proxy... how i go about tweaking the script to connect via proxy?
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Feb 20, 2010
I've problems to connect my empathy trough my office proxy. I already configure my amsn to access to my hotmail account and it works but when I try to use empathy it just doesn't connect.
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Jun 1, 2011
I'm running 10.10 on a pretty fresh install with a brand new system I built especially for Ubuntu.For some reason, I'm beginning to have trouble with accessing my Samba shares from this computer. I have a Windows Home Server also running on my network and I have to be able to access the files on it.At first Nautilus showed "SERVER" in the folder tree when I clicked on "Network" and everything was working great. A couple of days ago my WHS "SERVER" suddenly no longer showed up in Nautilus and I had to mount the WHS server manually (via "Connect to Server...").
Now, today, even that doesn't work. When I try to mount manually I get the error "Failed to Retrieve Share List from Server". I can now no longer access the WHS from Ubuntu at all.Why has my ability to access the Samba shares on my WHS deteriorated over time to the point where I can't access them at all?? Any ideas?I have other systems on this network (Mac and Windows) and none of the others have any problems at all with the WHS. Re-booting WHS and router has no effect. I've changed nothing in my set-up. Is this update related?
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Apr 28, 2011
how to connect the database to proxy server.example:: this is the acl in squid.conf to block the website.the keyword that want to block store in file .txt
acl block_advertisers urlpath_regex -i �/etc/squid/
block_advertisers.txt�
acl block_entertainment urlpath_regex -i �/etc/squid/
[code]...
a bit info, the data that stored in database is a keyword to block the website if a keyword in blacklist match with the url that want access by user. if match so then the user cannot access the website.
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Feb 18, 2011
there is a proxy server running on some machine on some specific port. so we connect to proxy to establish the connection over the internet.
now is it possible to connect to internet without connecting to proxy?
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May 19, 2011
When I installed Ubuntu 11 Server, it asked for a proxy http address. I gave it our address, I'll call it a.b.c.d. It did not, however, prompt for the port number (8080). Now, when I do the following:
sreeve@pto:~$ !20
sudo apt-get update
0% [Connecting to a.b.c.d (a.b.c.d)] [Connecting to a.b.c.d (a.b.c.d)]
it just sits there for a while and then says:
unable to connect to a.b.c.d
Is there a way to give it a proxy http address with the port number also?
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Jun 17, 2011
I have Dell DV6 Pavilion 2115 eg laptop and i installed Ubuntu 11.4 and internet and wireless worked, until i reboted my system it has disapear. I cant no longer to connect to a wireless network. It dont shows me any wireless network.My wireless card is Atheros AR 9285 802.11b/g/n Wifi Adapter.
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May 11, 2011
I use Fedora 14 and Firefox as my web browser. I use Astrill VPN service. I have the following persistent problem: I start my computer. Astrill is not set to start on boot. I start Firefox. Firefox can not connect to anything, it says 'proxy server refusing connections'. I go to Edit>Preferences>Advanced>Network>Settings I click the radio button 'no proxy'. The problem remains. I am completely unable to connect to the net. Even on reboot, I cannot connect. On reboot, Firefox is set to use a proxy, although it was not on shutdown. Some init script is setting this. My normal connection is often faster than through Astrill, so I only really need to use it when I want to get at a website that is blocked by the govt here in China.
where Firefox is being told to use a proxy, and how to reset it to not use a proxy, assuming Astrill is not active. There must be something left in a .conf file somewhere which is overriding the settings in Edit>Preferences. Because, if I set it now to 'no proxy', I cannot connect to the net.
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Aug 15, 2011
I want to connect to an FTP server from the Linux command line. The server is configured behind a proxy.
If I call:
echo $ftp_proxy
I get a result like this:
abc.def.ghi.jkl:8080
If I call:
ftp -pn $ftp_proxy
I get a unknown host error.
How can I connect to the FTP server using the Linux command line?
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May 20, 2010
I installed and configured a squid transparent proxy on my linux os at work. Also it is veryslow but every thing is ok while I do not try to use port 443,so when I try to use sites like mail.yahoo.com or other which are using https(443) port and the method used is CONNECT I see some errors in access.log like:
"NONE/400 xxxxx CONNECT error:method-not-allowed - NONE/- text/HTML"
and in cache.log somthing like:
""WARNING CONNECT method received on http Accelerator port 3128"
""WARNING for request: connect CONNECT login.yahoo.com:443 HTTP/1.1"
.
.
""ClientProcessRequest: Invalid Request"
[Code].....
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Aug 21, 2010
while configuring the yum through proxy i was configures with some address(10.x.x.x). after the proxy address has been changed(172.x.x.x).according to new proxy address i made changes in all locations in my system. but when i am trying to download through command line still it is trying to connect old proxy address(10.x.x.x). finally i come to know that, still some location old proxy address (10.x.x.x).is there.
how to troubleshoot this issue.(how to find the location) i was try to debug find the output below DEBUG output created by Wget 1.11.4 Red Hat modified on linux-gnu.
[Code].....
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Jun 3, 2011
Trying to connect to an external (Ubuntu) server via SSH. I've been given a port number, (externally accessible) IP address, and username. Could someone give me the format for entering this stuff into the terminal, or, if that isn't allowed, some other means of connecting?
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Jan 31, 2010
In order to have greater control over the emails sent out the company I imagined the following scenario.ScenarioDescribing in words what I need.ser sends an email to user@hotmail.com for example, using the smtp of my isp (is the internet).Before the email is sent, the firewall checks if the recipient is blocked transparent, if you are locked out rejects the email.I searched several forums and mailing lists, but did not find scenarios similar to mine.Where found situations in which the mail servers were internally in the company, which is not my case.
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Jan 13, 2010
I have a FTP server (vsftpd) setuped on a Linux box (Ubuntu server). When I try to connect with a computer on the same network everything works fine as expected.But as soon the IP is external it won't connect..I first assumed the port was blocked, but then:localserver:$ sudo tail -f /var/log/vsftpd.logWed Jan 13 14:21:17 2010 [pid 2407] CONNECT: Client "xxx.xxx.107.4"remotemachine:$ netcat svn-motion.no-ip.biz 21220 FTP ServerAnd it hangs there. Do any ports other than 21 need to be open?
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