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• Remote Control Home PC from Corporate Work PC

  - by muncherelli

  Here is my situation: I am currently on a Windows XP workstation at work. I have an android tablet that I use to splashtop into my home PC. I would like to be able to use my work keyboard and mouse to control my home PC while I am splashtop'd into it using my tablet. My work PC is on a corporate LAN, and not on the same network as my tablet. The company I work for provides wifi for personal devices, but they are not accessable to the internal network. I thought about going the Synergy route, however that would require my home PC to be able to connect to my work PC which isn't really possible. The opposite would work though, if I could reverse connect the server to the client, but the Synergy software doesn't really support that. I do have a couple linux boxes running at home, so I can ssh into my home network and tunnel ports via SSH if needed. With what I have, how can I accomplish seamless keyboard and mouse sharing between my work PC and either my home PC or my android tablet?

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• Set up a root server using Ubuntu and Virtualization

  - by Daniel Völkerts

  Hello, I'd like to setup a fresh root server and install a linux based virtualization on it. My thoughts are on: Intel VTs Hardware Ubuntu 9.10 KVM based virt. The access to the root server will only be SSH for Administration. Has anybody done this before, what was your glues discovered in the daily use? My requirements are: very secure, so the root server only has ssh to the dom-0 and minimalistic ports for the guest (e.g. http/s). good monitoring of host/guest (my idea is to using zabbix for it) easy and fast administration (how are the command line tools working for you? cryptiv? high learning curve?) I'm pleased to learn from your suggestions. Regards, Daniel Völkerts

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• Backing up mail accounts without full access to mailserver

  - by Agos

  Hi everybody. I'm in the process of migrating some stuff from a (crappy) hosting. Files were easy with SSH access, but mail is giving me some thoughts. This is the situation: qmail server, no ssh access I own postmaster account accounts are accessible via web interface or POP3 I'm interested in transferring emails, but if whole accounts can be transferred it'd be better. Being POP3 I'm fairly confident every message has been downloaded, but of course I'd like to download the whole thing to be safer. Right now I have this in mind: Enter in web admin Change each account's password (it's only a dozen or so accounts so still feasible) Send new password to user telling him please not to change it getmail or something like that put on new IMAP server in some way (which I still haven't planned) But I feel there should be a better way to do this. Is there? Thanks in advance!

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• Using Cygwin in Windows 8, chmod 600 does not work as expected?

  - by Castaa

  I'm trying to change the the permissions to my key file key.pem in Cygwin 1.7.11. It has the permissions flags: -rw-rw---- chmod -c 600 key.pem Reports: mode of 'key.pem' changed from 0660 (rw-rw----) to 0600 (rw-------) However: ls -l key.pem still reports key.pem's permission flags are still: -rw-rw---- This reason why I'm asking is that ssh is complaining: Permissions 0660 for 'key.pem' are too open. when I try to ssh into my Amazon EC2 instance. Is this an issue with Cygwin & Windows 8 NTFS or am I missing something?

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• How to proxy and encrypt all my internet traffic with Win7 and Win2008R2?

  - by Malartre

  Hi, I have a Windows 7 laptop and a Windows 2008 R2 server. How can I encrypt and route all my internet request from the Win7 laptop to the Win2008R2 server? I guess the server would be called a proxy? Goal is to prevent unencrypted network snooping. I found this article about using SSH, but I would prefer an official windows integrated solution. What's the Microsoft "way" on this? http://lifehacker.com/237227/geek-to-live--encrypt-your-web-browsing-session-with-an-ssh-socks-proxy I would like this to work for all internet traffic, not just browser traffic and I would like to set this up on many Win7 clients. Carl

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• VirtualBox "Bridged Adapter" when host NIC is turned off

  - by chris_l

  Hi, I'm running Linux (Debian Etch) in a VirtualBox VM on my MacBook. I usually ssh from my Mac terminal to the guest machine. I also want to access the internet from my guest, so I set up my host's WLAN card (en1) as a bridged adapter for eth0 on the client. This works fine, but when I turn off the WLAN card (e.g. to reduce battery consumption), I'd still like to ssh from my host to the guest. This fails of course, because en1 loses its IP address. Is a bridged adapter the best option for what I want to do? How can I make it work? (A simple "ifconfig en1 add 10.0.0.4" didn't do the trick...) Thanks Chris

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• Hp Procurve Switch : port filtered

  - by user117140

  My HP Procurve switch is blocking port 22 and I dont know how to unblock it.Please let me know From the server, see port 22 is blocked [root@server ~]#nmap -p22,80,443 10.247.172.70 Starting Nmap 4.11 ( http://www.insecure.org/nmap/ ) at 2012-04-16 14:12 IST mass_dns: warning: Unable to determine any DNS servers. Reverse DNS is disabled. Try using --system-dns or specify valid servers with --dns_servers Interesting ports on 10.247.172.70: PORT STATE SERVICE 22/tcp filtered ssh ------------------> see 80/tcp filtered http 443/tcp filtered https This is blocked on cisco switch but I dont have any clue how this is done. I know that vlan is configured on switch. vlan 54 ip ospf 10.247.172.65 area 0.0.0.10 vrrp vrid 54 owner virtual-ip-address 10.247.172.65 255.255.255.192 priority 255 enable exit exit Please let me know how to unblock ssh port 22 access on this switch?

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• Machine only responds to network requests from machines it is pinging

  - by ILikeFood

  I have two machines. WOPR: Ubuntu server edition 10.10 LTS 32 bit Adam Selene: Windows 7 home premium 64 bit / Ubuntu Desktop 10.10 LTS 64 bit I want to be able to SSH from Adam Selene to WOPR, so I connect them to the same network. Here's where things get weird. I cannot connect to WOPR in any way under normal circumstances. But, if WOPR is pinging Adam, then it starts responding to ping requests, HTTP gets, and SSH tunnels. I'm an amateur, and brand new to Ubuntu server, so I suspect there's a misconfiguration somewhere, but there's an off chance it's a bug in the OS. Does anyone know what might cause this behavior? Thanks a lot!

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• What's the situation that requires stateful firewall?

  - by Eonil

  I just know there is two kind of firewalls. Stateless and stateful. It's hard to determine what kind of firewall I have to use. Currently I have to run firewall within same machine runs services, Basically I want stateless because of its less resource consumption. However if it is not sufficient for security, it's meaningless. I'll run HTTP, SSH, NFS (only over SSH), and some custom made server on several TCP/UDP ports. Should I use stateful firewall? (edit) Maybe the question can be assumed as 'Should I use stateful rules?'.

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• zeroconf (bonjour/avahi): macs do not see linuxes and vice versa

  - by codesnik

  In my home network I have several OS X boxes and several Ubuntu boxes. each Ubuntu box sees other boxes via zeroconf. I can "ssh ubuntu1.local" and "ping ubuntu1.local" from "ubuntu2.local", but both fail to lookup OSX boxes. and other way around, I can "ssh mini1.local" from "mbair.local". but it doesn't see "ubuntu1.local" why? do ubuntu and osx use different flavours of zeroconf? could be ubuntu, or osx tweaked to use common flavour?

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• Server suddenly running out of entropy

  - by Creshal

  Since a reboot yesterday, one of our virtual servers (Debian Lenny, virtualized with Xen) is constantly running out of entropy, leading to timeouts etc. when trying to connect over SSH / TLS-enabled protocols. Is there any way to check which process(es) is(/are) eating up all the entropy? Edit: What I tried: Adding additional entropy sources: time_entropyd, rng-tools feeding urandom back into random, pseudorandom file accesses – netted about 1 MiB additional entropy per second, problems still persisted Checking for unusual activity via lsof, netstat and tcpdump – nothing. No noticeable load or anything Stopping daemons, restarting permanent sessions, rebooting the entire VM – no change in behaviour What in the end worked: Waiting. Since about yesterday noon, there are no connection problems anymore. Entropy is still somewhat low (128 Bytes peak), but TLS/SSH sessions have no noticeable delay anymore. I'm slowly switching our clients back to TLS (all five of them!), but I don't expect any change in behavior now.

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• How to proxy and encrypt all my internet traffic with Win7 and Win2008R2?

  - by Malartre

  I have a Windows 7 laptop and a Windows 2008 R2 server. How can I encrypt and route all my internet request from the Win7 laptop to the Win2008R2 server? I guess the server would be called a proxy? Goal is to prevent unencrypted network snooping. I found this article about using SSH, but I would prefer an official windows integrated solution. What's the Microsoft "way" on this? http://lifehacker.com/237227/geek-to-live--encrypt-your-web-browsing-session-with-an-ssh-socks-proxy I would like this to work for all internet traffic, not just browser traffic and I would like to set this up on many Win7 clients. Carl

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• Server responses "bus error" to every command

  - by Temnovit

  I have a linux machine dedicated to MySQL server with a pretty high load. Today I woke up and was terrified to see, that database server is down. I could connect to it via SSH, but it was responding with bus error to each and every command. [root@r1304 home]# ls Bus error [root@r1304 home]# tail /var/log/messages Bus error [root@r1304 home]# reboot Bus error [root@r1304 home]# free -m Bus error [root@r1304 home]# chkdisk Bus error I went to Data Center and did a hard reset, which seemed to help, but after a half an hour situation reapeated and now I can't even connet via SSH anymore. Any ideas what this could be? how to diagnose such a problem and what are possible fixes? Server has 32 GB RAM, 2xSSD drives with software RAID UPDATE According to Zabbix, when MySQL died, number of processes stated to increase drammaticaly, until I did a hard reset. What could those be? Number of processes

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• Fedora Core 11 won't boot without a monitor

  - by feihtthief

  I have a P4 system that I installed Fedora 11 on. It will not boot without a monitor attached. The monitor can be off (not even have power plugged in), but must be attached. Without a monitor the hard disk thrashes around a bit like it's starting up services, but does not get to the point where I can ssh into the box. I have set the default runlevel to 3 and removed the rhgb entry from grub. Any suggestions welcome. Edit: I have already set the run-level to 3. The machine boots up fine with the monitor plugged in to the point where I can SSH into it. as soon as i unplug the monitor and reboot, it will not boot to that point.

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• Address VMWare Fusion Linux guest by hostname?

  - by amrox

  I have a Ubuntu Server 9.04 image set up in VMWare Fusion 3.0.0, using the NAT option for the guest's network connection. From the Mac host, I can ssh to the linux guest just fine using it's IP address, but I would like to be able to refer to it by hostname for connivence. ie: mac-host:~ ssh [email protected] I had a similar setup using Parallels a couple years ago, but I don't remember how it was set up. It may have "just worked". Any suggestion on how to make this work?

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• unable to start apache after changes to rc.conf and resov.conf

  - by shupru

  I had a working configuration this morning with the following simple /etc/rc.conf ifconfig_rl0="DHCP" ifconfig_xl="inet 192.168.1.11 netmask 255.255.255." defaultrouter="192.168.1.1" I added the following lines: firewall_enable="YES" firewall_type="SIMPLE" firewall_logging="YES" sshd_enable="YES" apache_enable="YES" mysql_enable="YES" my httpd.conf includes: NameVirtualHost 192.168.1.11 <VirtualHost 192.168.1.11> ... </VirtualHost> now apache and ssh server are down. changed rc.conf back to last working configuration and still no ssh or apache apachectl start #--> /usr/local/sbin/apachectl start: httpd could not be started apachectl status #--> Looking up localhost Making http connection to localhost Alert!: Unable to connect to remote host.

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• Allowing outbound traffic with APF/iptables for OpenVZ container

  - by David

  I have apf installed on a OpenVZ container (proxmox 2.1). The config is pretty much vanilla and things are working. My external services like ssh and http are working. My problem is that all outbound traffic on http/https is blocked. How do I allow all outbound traffic for http/https. If I change EGF to 1 like this, all inbound and outbound traffic gets blocked EGF="1" EG_TCP_CPORTS="21,25,80,443,43,53" EG_UDP_CPORTS="20,21,53" EG_ICMP_TYPES="all" I opened a single outbound rule with the following # /usr/local/sbin/apf -a downloads.wordpress.org How do I allow all outbound traffic on http/https without blocking all traffic? Why would I allow all inbound ssh/http traffic and block all outbound traffic?

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• [iptables] Why do 'iptables -A OUTPUT -j REJECT' at the end of the chain OUTPUT override the previous rules??

  - by Serge

  Those are my IPTABLES rules: iptables -A INPUT -m state --state ESTABLISHED,RELATED -j ACCEPT iptables -A OUTPUT -p tcp --dport 22 -j ACCEPT iptables -A OUTPUT -p udp --dport 22 -j ACCEPT iptables -A OUTPUT -p tcp --dport 80 -j ACCEPT iptables -A OUTPUT -p udp --dport 53 -j ACCEPT iptables -A OUTPUT -p tcp --dport 53 -j ACCEPT iptables -A INPUT -p tcp --dport 80 -j ACCEPT iptables -A INPUT -p tcp -m tcp --dport 22 -m state --state NEW -m recent --set --name DEFAULT --rsource iptables -A INPUT -p tcp -m tcp --dport 22 -m state --state NEW -m recent --update --seconds 180 --hitcount 4 --name DEFAULT --rsource -j DROP iptables -A INPUT -p tcp -m state --state NEW --dport 22 -j ACCEPT iptables -A OUTPUT -j REJECT iptables -A INPUT -j REJECT iptables -A FORWARD -j REJECT Im using a remote ssh conetion to set them up, but after i set: iptables -A OUTPUT -j REJECT My connection get lost. I have read all the documentation for Iptables and i can figure out anything, the global Rejects for INPUT work well because i can access to the web page but i get a timeout for ssh. Any idea? Thanks

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• How can I find the original un-changed configuration file to compare with the *.rpmnew file?

  - by User

  While upgrading from CentOS 5.7 to 5.8 I've received the following warnings: warning: /etc/sysconfig/iptables-config created as /etc/sysconfig/iptables-config.rpmnew warning: /etc/ssh/sshd_config created as /etc/ssh/sshd_config.rpmnew warning: /etc/odbcinst.ini created as /etc/odbcinst.ini.rpmnew (To know the reason for such files, and what one can do with them read - Why do I have .rpmnew file after an update? ) I want to know what exactly has been change in the default config file by comparing the old default file (the original un-changed configuration file) with the new default file (*.rpmnew). Then, I can apply the changes to my modified file (aka diff merge). The problem is I don't know where can I find the original un-changed configuration file...

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• Manually forcing TCP connection to retry

  - by Vi.

  I have a TCP connection (SSH session to some computer for example) Network suddenly goes down and drops all packets (disconnected cable, out of range). TCP resends packets again and again, retrying with increasing delays. I see the problem and plug the cable back (or restore network somehow). TCP connection finally successfully resends some packet and continues. The problem is that I need to wait for a some timeout on point 5. I want to use my opened SSH session now and not wait for 5-10 seconds until it finds out that connection is working again. How to force all TCP connections to resend data without delays in GNU/Linux?

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• Azure VM : Connection refused by host

  - by Simon Kérouack

  I recently stopped a subscription with 14 VMs in it and restarted it a few days later. Now all my VMs are working just fine at the exception of 6 used for MongoDB. They respond to ping and so they show as online in the azure dashboard but they do not answer to anything else. I tried (from different locations, in and out of the azure cloud) ssh : connect to host * port *: Connection refused telnet : Unable to connect to remote host: Connection refused mongo : exception: connect failed The ports for ssh and mongo are opened in azure. I tried restarting the VMs a few times trough the azure dashboard, they seem to restart successfully but still refuse all connections. I already looked for similar issues and the best solutions I found was to wait... the issue has been happening for 7 days and waiting is no more an option.

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• Routing with VPN and asymmetric communication

  - by Louis

  I'm stumbling on a problem that requires your advice. Keywords : networking, route, openVPN Problem : I have a local network with several physical servers and VMs. These machines have ip's in the range 10.10.x.x. I can access these machines from the Internet with the help of openVPN. These machines can : access each other within the local 10.10.x.x subnet access the Internet via the VPN can themselves be accessed (via SSH) from the Internet via the VPN. There is one machine however that behaves strangely and I don't know why. I can SSH into this machine from anywhere via SSH and I can also PING it from anywhere (including the Internet). However from this machine (i.e. when logged into it) I cannot access the Internet or ping machines outside the local network. In other words it will not go beyond the VPN. My question is why? Here are some technical details: The machine's Network Config (running Debian 6.0.3): allow-hotplug eth0 iface eth0 inet static address 10.10.10.200 netmask 255.255.0.0 network 10.10.10.0 broadcast 10.10.10.255 gateway 10.10.10.200 The machine's Routing : Destination Gateway Genmask Flags MSS Window irtt Iface 127.0.0.1 0.0.0.0 255.255.255.255 UH 0 0 0 lo 10.10.0.0 10.10.10.250 255.255.0.0 UG 0 0 0 eth0 10.10.0.0 0.0.0.0 255.255.0.0 U 0 0 0 eth0 0.0.0.0 10.10.10.250 0.0.0.0 UG 0 0 0 eth0 0.0.0.0 10.10.10.200 0.0.0.0 UG 0 0 0 eth0 The VPN's Network Config (running Debian 6.0.3): # This is the local network interface auto eth1 allow-hotplug eth1 iface eth1 inet static address 10.10.10.250 netmask 255.255.0.0 broadcast 10.10.10.255 gateway 10.10.10.250 The VPN's routing table Destination Gateway Genmask Flags MSS Window irtt Iface 10.10.0.0 0.0.0.0 255.255.255.0 U 0 0 0 tun0 private 0.0.0.0 255.255.255.0 U 0 0 0 eth0 10.10.0.0 0.0.0.0 255.255.0.0 U 0 0 0 eth1 0.0.0.0 10.10.10.250 0.0.0.0 UG 0 0 0 eth1 0.0.0.0 private 0.0.0.0 UG 0 0 0 eth0 net.ipv4.ip_forward = 1 on both machines. there are no iptables set anywhere. Thanks in advance for any feedback.

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• Statsd, Graphite and graphs

  - by w00t

  I've setup Graphite and statsd and both are running well. I'm using the example-client.py from graphite/examples to measure load values and it's OK. I started doing tests with statsd and at first it seemed ok because it generated some graphs but now it doesn't look quite well. First, this is my storage-schema.conf: pattern = .* retentions = 10:2160,60:10080,600:262974 I'm using this command to send data to statsd: echo 'ssh.invalid_users:1|c'| nc -w 1 -u localhost 8126 it executes, I click Update Graph in the Graphite web interface, it generates a line, hit again Update and the line disappears. If I execute the previous command 5 times, the graph line will reach 2 and it will actually save it. Again running the same command two times, graph line reaches 2 and disappears. I can't find what I have misconfigured. The intended use is this: tail -n 0 -f /var/log/auth.log|grep --line-buffered "Invalid user" | while read line; do echo "ssh.invalid_users:1|c" | nc -w 1 -u localhost 8126; done

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• how to get bash prompt on login

  - by user419534

  When I connect to remote machine uisng ssh, by default it is not on bash prompt. To get bash prompt by default on login I did as below by create .cshrc file in my home directory if ($?prompt) then setenv SHELL /bin/bash exec $SHELL -login endif It works well and I am getting bash shell but I have another file as .bashrc in my home directory which gets executed when i run bash explicitly and I have done lot of customization in this file as per my requirement. Is it possible to get my .bashrc executed somehow from .cshrc or some other way? For example I need to go connect to host B from host A, I do this From A - ssh B this brings host B but not with bash prompt. To get bash prompt I created .cshrc as mentioned above but my above code snippet does not call my .bashrc script.

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• Set up Ubuntu in Virtualbox to have static ip

  - by Don H

  I frequently work in different locations, and need to have a virtualbox version of Ubuntu server running locally. While I was at home getting it set up, I was able to ssh into the server using the locally allocated IP address. However, now that I'm elsewhere, ifconfig is still showing the old 10.0.x.x ip address, but instead of being in the 10.0.x.x space, my laptop's ip starts with 192.168.x.x With that in mind, if there a straightforward way to set up the virtual box Ubuntu server in such a way that I can just connect using "ssh servername" regardless of it's ip address?

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