Fedora Networking :: Telnet Works Localhost But Not Network / Firewall Disabled
Jun 3, 2011
I'm working on setting up access for our developer via Telnet, we are on a local network behind a physical firewall. I set up the standard Telnet service for Fedora15 and from localhost I can login via any user and root.... However I cannot login from another terminal on the LAN, even though I can ping and FTP to the fedora15 box. I added the firewall rules for telnet, that did not work, so I disabled the firewall, still cannot get a connection via port 25. I feel either port 25 is closed in another manor or the telnet is restricted to the localhost.
Also I cannot login to root to configure the Firewall Desktop GUI, only standard users, is this an issue? I also cannot login to the console as root even though I use the correct password.I can only su to root and sometimes it is a PITA. There must be some settings to clear these issues up...
I'm running Telnet Server, VFTP, and VNC on a Fedora 14 box. The box's internal IP is 192.168.1.222 This machine is configured to live in the DMZ, The firewall is up on both the router and this box. I can remote in from home using our external IP. I can FTP. I can Telnet. All using our external IP. When i'm in the office, i can remote in using our external IP. I can FTP. I can Telnet. Again, all with the external IP. If i attempt to telnet 192.168.1.222 i get a connection refused. i can ping the 192.168 address
nmap tells me that all 1000 ports on 192.168.1.222 are closed nmap tells me that my expected ports are open on the external IP.
.... This is a relatively new conundrum as it "used to work", and only appears not to since our last reboot (power outage). I know i have to be missing something simple here, but i differ to the experts.
i have a hp 6500 e709a printer. have configured for network printing and would like to use the scan facility.i have tried to scan from the printer but it does not find the computer. the hp documents mention advanced firewall information on incoming udp ports and tcp ports etci believe it is with my machine as my son has a windows box with the hp software and i have managed to scan from that machine.
I have recently upgraded to a VPS for the purpose of web hosting a group of sites related to my business.The reason for the upgrade was because we wish to run a shopping cart software which required greater memory for PHP and the VPS was the most economic solution. So, I have very basic linux knowledge but I am the definition of a newbie when it comes to going further than just scratching the surface of server configuration! I have successfully hosted our main site for a number of weeks but recently the postfix service stopped sending mail. I have Plesk Control Panel installed and postfix continually shows as not started even though in SSH the service status is definitely running - I have gone through the troubleshooting checklist here (http://www.postfix-book.com/debugging.html#d0e6) but can't get any further than section 2.1 as when running the host command (#host relay-test.mail-abuse.org), I get # -bash: host:command not found. I've gone further in the document but not found any issues...
When postfix was working properly (i.e. sending emails!), the plesk CP showed the service as started and all emails from the website were sending as normal. The mailq command is showing the messages stuck in the mailq and the maillog shows the following:- http://pastebin.centos.org/36446 - these are the latest few pages.To check the configuration and basic elements I have flushed the mailq (which shows a stack of messages waiting) and I have also spent a long time (2 weeks) reading up on the parameters that should be in main.cf and master.cf.I have found that when I 'telnet localhost 25' I get the following response...[root@s15397216]# telnet localhost 25Trying 127.0.0.1...Connected to localhost.Escape character is '^]'.
Since I installed FC11 I can't get vpnc to work (I always getno response from target").Also I can't ping any external IP even with the firewall disabled.What I see strange is that I had the same configuration in FC10 and the router configuration seems okay to me:
Kernel IP routing table Destination Gateway Genmask Flags Metric Ref Use Iface 10.64.64.64 * 255.255.255.255 UH 0 0 0 ppp0
I have a question about telnet.Is there any way to configure a telnet server without disable firewall.I am using redhat 5.2 and fedora 12.I have lack of knowledge about firewall.
I've just installed Fedora 12 (32 bit) KDE on my test system and have a couple of issues.I haven't played with Fedora for a couple of years, so I'm not very familiar with it. I haven't had the problems with Kubuntu, OpenSUSE nor Mandriva, so I'm a bit in the dark here. I'll see if someone can help me with my sound issue, before moving on to the next problem. I've read seveal posts about sound issues, but not sure exactly if any are the same as I'm having.
After installing Fedora 12, sound was all working fine. I think installed all the available updates, which is when the problem began. Basically, I have sound in Hulu, Firefox videos such as CNN, etc. But, I have no sound at startup or shutdown....system sounds, I suppose I should say. I have disabled SELinux and the firewall, before I began updates. Looking in KInfoCenter under Audio, I see:
Audio Devices: NOT ENABLED IN CONF VIA8247 with ALC655 at 0xc400 IRQ11 In System Settings>Multimedia I see Internal Audio Analog Stereo as the only device shown. I have unchecked Mute and have all volume controls up all the way in KMix, which shows HDA Nvidia on the tab.
I have installed httpd on Fedora 13 with yum, but it is not working when I type in a browser : localhost
Code: [comp42 html]$ sudo /etc/init.d/httpd start Starting httpd: [ OK ] [comp42 html]$ sudo /etc/init.d/httpd restart Stopping httpd: [FAILED] Starting httpd: [ OK ] [comp42 html]$ sudo /etc/init.d/httpd stop Stopping httpd: [FAILED] [comp42 html]$ sudo /etc/init.d/httpd status httpd is stopped [comp42 html]$ sudo /etc/init.d/httpd start Starting httpd: [ OK ] [comp42 html]$ sudo /etc/init.d/httpd status httpd dead but subsys locked [comp42 html]$ sudo /etc/init.d/httpd help [comp42 html]$ sudo /etc/init.d/httpd fullstatus Connection refused [comp42 html]$
Tried to reinstall several times, but nothing works. My firewall is disabled, does not work either while enabled. My httpd conf is the default one. What is going wrong?
I've tried searching for this peculiar behavior, but couldn't find a solution that works for it - I have installed Redhat on my system and have a listener running on port 7878. I wanted to check if the port is accessible from a machine on the network, and so i telnet-ed from a remote machine and it worked. Now comes the weird problem - I used the same command (telnet xxx.xxx.xxx.xxx 7878) locally and it was able to telnet. However, if I try to connect using localhost, meaning, "telnet localhost 7878" or "telnet 127.0.0.1 7878", it gives me the following error:
Trying 127.0.0.1... telnet: connect to address 127.0.0.1: Connection refused telnet: Unable to connect to remote host: Connection refused
Here is my /etc/hosts entry:
# Do not remove the following line, or various programs # that require network functionality will fail. 127.0.0.1 localhost.localdomain localhost ::1 localhost6.localdomain6 localhost6
[Code]....
Not sure where the problem is. I expect telnet to connect irrespective of whether i use the IP address OR localhost when i use telnet locally.
I had installed Fedora 12. I am using 4 LAN Cards. All these cards were configured using network manager, but i am not able to acivate /deactivate these cards using acivate /deactivate buttons since they got disabled. I could activate the cards by running /etc/init.d/restart network. Anyone knows why the acivate /deactivate buttons in network manager are disabled .
I have just installed FC12 on my machine - and gone Windows free for the first time ever. Now I do use various flavours of Linux on a daily basis but not from an installation/sys admin point of view so my questions here may seem a little basic but pleas eindulge me if you will!
Now, my network connection works perfectly well under the following scenarios.
The only scenario that does not work is FC12, wireless with SSID broadcast disabled.
I can only assume that it is an issue with my USB modem (a linksys WUSB54GS) since the same set-up works fine from my laptop running Ubuntu with an internal wireless card.
Now, I know from reading the forums that it's pretty easy to get around a disabled SSID broadcast but this is an itch I just have to scratch....what the hell is causing this problem?
nm-tool ouput is as follows:
I have tried using wpa_supplicant but I am not sure which driver I am using here - is it ndiswrapper per chance?
(Driver: rndis_wlan)
How I can connect once again to my wireless router with SSID broadcast turned off.
I want to write a custom rule to allow all connections to the ip addresses on my local network (192.168.2.2 through ...99) but I don't know how. I know adding a custom rule asks me to read a file and put it in "iptables" format, but I don't know how...
I am new with IP tables stuff and i have a problem....i have a pc Contain a fedora OS and i want to make a small network (4 PCs Contain XP OS) and using the pc of fedora OS as a firewall i want to Prevent the ping (i think it called(ICMP)) in the privat network and prevent one of the PCs from Browsing internet(prevent port 80 and 81 as i think) and i still don't know how to make the internet go Through the firewall to the private network...
telnet localhost 143Trying 127.0.0.1...Connected to localhost.localdomain (127.0.0.1). Escape character is '^]'.* OK [CAPABILITY IMAP4rev1 UIDPLUS CHILDREN NAMESPACE THREAD=ORDEREDSUBJECT THREAD=REFERENCES SORT QUOTA IDLE ACL ACL2=UNION STARTTLS] Courier-IMAP ready. Copyright 1998-2005 Double Precision, Inc. See COPYING for distribution information.a login rakesh@sanjiv.com rakesha NO Login failed.i have problem when Installing Courier-imap/imaps with Courierpassd .
I just got Ubuntu and am new at this stuff. I have a dual boot windows 7 64 bit one and ubuntu 10.4. I booted ubuntu at startup and then tried to go online, but it says my wireless device is disabled. I tried pressing the keys on my keyboard to see if that may work, but it doesn't. I am lost and new at this.
I have been running FC8 on this IBM T23 with a D-Link wireless adapter. Using MadWifi this has worked fine with Network Manager disabled. But now I have nuked that installation and replaced it with FC10. Network Manager is nice, and I would like to use it. And it kind-of works. Network Manager recognizes my router and all my neighbor's routers, but I can't connect.
I have Ubuntu 9.10 hooked up to my router through a wired NIC, and a couple of windows machines that are connected to the router through wireless cards.I want to telnet or ssh into the ubuntu box using putty on one of the windows machines. I have attempted to do this using the ubuntu ip address and the name of the box, and neither approaches have worked.
I recently installed Ubuntu x64 on my dell studio 1535 using the windows installer (wubi).
All seems to be working fine apart from the built in wireless card, the proprietary driver (found in hardware drivers) installs and activates successfully and works perfectly. Until I shut down or restart the system. On the next boot the wireless card is 'disabled' and no longer works.
The card I have is a Broadcom Corporation BCM4312 802.11b/g
I am going to try a proper install on a second partition rather than using wubi later on but wondered if this was a commonly occuring problem?
The wireless card works as soon as the driver installs, however I am shown a "restart to activate driver" message and after restarting it's dead.
I'm currently on F11, and experienced problems with Network Manager. Whenever I to connect to a network, wired or wireless, it just seems to try to connect, and then after 2-3 seconds, it just reports "Disconnected"..
Then I switched to network, and both wired and wireless works. so I don't think there is any driver or hardware issue...
Does anyone have any idea of this problem? The network manager have worked on the live CD version ( before installed to HD).
I have a Fedora 12 box, which works absolutely fine in a fastweb wlan. However, if I connect to another wlan where I need to link to a wireless access point cabled to the ISP modem/router, networkmanager shows the connection is ok, but...
1) I only can browse internet (es:www.google.it) for a few seconds after the connection is established, thanfirefox goes "Impossible to reach the server"
2) the same behaviour is confirmed by ping
Code:
[Adriano@localhost ~]$ ping www.google.it PING www.l.google.com (209.85.135.106) 56(84) bytes of data. 64 bytes from mu-in-f106.1e100.net (209.85.135.106): icmp_seq=1 ttl=49 time=138 ms 64 bytes from mu-in-f106.1e100.net (209.85.135.106): icmp_seq=2 ttl=49 time=127 ms
[code]....
EDIT: There is a win box in the same net that is working fine.I see in the router config that ARP for the working machine is "complete", while for the Fedora one is "incomplete" Nothing changes configuring a static or dynamic IP address for the Fedora box I had a previous Fedora 11 installation on the same machine that now gives troubles, and it worked fine. But I can't tell if it's a software problem because my ISP seems to have telnet-ed the router, changing it's firmware (and maybe it's config). Shame on they.
I am trying to find the difference between the above two services. Both are under xinetd and can someone please explain the difference between them (is one more secure than the other one?)
I'm having trouble pinging localhost, specifically, pinging localhost when I'm not connected to a network. When I try it keeps telling me the operation is not permitted:
Code:
matt@mubuntu:~$ ping localhost PING localhost (127.0.0.1) 56(84) bytes of data. ping: sendmsg: Operation not permitted ping: sendmsg: Operation not permitted
if I connect to the network, start pinging then disconnect it continues pinging. Google seems to think it could be something to do with my iptables setup:
matt@mubuntu:~$ route -n Kernel IP routing table Destination Gateway Genmask Flags Metric Ref Use Iface 127.0.0.0 0.0.0.0 255.0.0.0 U 0 0 0 lo
But as far as I can tell there isn't anything in there which would stop me connecting to the localhost (I also can't connect to my local apache instance when offline)... (It's worth mentioning that a couple of weeks ago I had the pc setup to share it's internet connection with a laptop, ala this guide, however I've since disabled the iptables rules and disabled ip forwarding.)
