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• "Permission denied (publickey)" error when ssh'ing to Amazon EC2 Debian AMI 05f3ef71

  - by user193537

  I have launched a Debian system using AMI 05f3ef71 in Amazon EC2, but I have no lock connecting to it using SSH as suggested in "Connecting to Your Linux/UNIX Instances Using SSH". I tried several user names: ec2-user, root, debian... None of them worked. I always get a Permission denied (publickey) error message. Using ec2-get-console-output instance_id as suggested doesn't work either, it requires option "-K". If I supply it, I get the error message Required option '-C, --cert CERT' missing, but I have no idea what to supply there. Port 22 is opened on the affected instance. Does anyone have an idea what I could try to log in to my instance?

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• How to make all of my IPs works in HyperVM XEN?

  - by user758667

  I've installed HyperVM on CentOS 5.8 final to make XEN VPS. I have 5 IPs, and added them to an IPPool. They are from *.123 to *.126. But when I add Virtual machines, just the first one (which indicate to *.123 ip) works well. I mean I can ssh to it by "works well" and when I want ssh to the other ones ( *.124 *.125 ...) it says : ssh: connect to host *.124 port 22: Connection timed out after a while. I alos set gateway and netmask as it shows in my server IPAdresses for device eth0 (it doesn't make any difference if I set these or not, I get same error). What should I do now? Thanks.

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• Can you use a DVI-VGA Adapter on a monitor instead of a video card?

  - by Joel Coehoorn

  I suspect the answer to this is "no", but here goes: I have a monitor with inputs for DVI and VGA. I want to be able to share this display with two computers (one at a time, of course) that both have VGA only. I also have a DVI-VGA dongle that came with a video card that's in a different computer. Can I connect this dongle directly to the DVI port on the monitor so that I can connect both VGA computers? I'd rather not resort to a kvm.

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• xenserver: xe command never returns?

  - by ethrbunny

  I'm trying to port a xen server 6.2 pool to a new IP address range. I've got three servers total: 2 currently at their new IP but no longer in the pool and one remaining. I'm trying to set IP address information on the two disconnected ones using the xe command and all of its variants. Oddly enough, it never returns with any values. xe host-list It just sits there until I ctrl-c it. The server is still awake and responding though. I can enter other commands (EG ifconfig) and they work fine. If I enter this same command on the remaining server in the pool it works ok. I've tried restarting the toolstack and even rebooting. No change. What am I doing wrong?

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• How can I access blocked sites while in China?

  - by Samuurai

  I have some colleagues who need to go to China for work, however while they're there, they can't access a lot of sites. One of which is GMail (Google Apps), which they need for work. We have a UK based Ubuntu server, which I have root access for. What can I do for them? I thought about a Squid proxy, but it might rely on their hotel having port 8080 open, so, not ideal. Are there any workarounds or other solutions?

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• Home router for higher network loads

  - by Zizzencs

  I'm trying to find a replacement for my ASUS WL500GP router. Some constraints: my ISP now provides 120 Mbit bandwidth - the router must be able to handle it I have 3 computers and a laptop at home - the router must have at least 4 LAN ports and the WAN port I need to be able to do the following in parallel: use bittorrent with ~1000 connections transfer files from one home computer to another at high speed access one home computer from my workplace I don't really need wireless I don't really want two boxes to serve all these purposes. So I was searching for a router with 1 Gbit ports, jumbo frame support and good reviews, but haven't really found a promising candidate so far. Any suggestions?

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• Load balanced proxies to avoid an API request limit

  - by ClickClickClick

  There is a certain API out there which limits the number of requests per day per IP. My plan is to create a bunch of EC2 instances with elastic IPs to sidestep the limitation. I'm familiar with EC2 and am just interested in the configuration of the proxies and a software load balancer. I think I want to run a simple TCP Proxy on each instance and a software load balancer on the machine I will be requesting from. Something that allows the following to return a response from a different IP (round robin, availability, doesn't really matter..) eg. curl http://www.bbc.co.uk -x http://myproxyloadbalancer:port Could anyone recommend a combination of software or even a link to an article that details a pleasing way to pull it off? (My client won't be curl but is proxy aware.. I'll be making the requests from a Ruby script..)

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• Postfix cleanup daemon access control

  - by Flimzy

  Is there any way to control which hosts are permitted to connect to the cleanup daemon over TCP? Our 'master.cf' contains: 2526 inet n - - - 0 cleanup This is necessary because we have a cluster of SMTP servers running custom code, and they can all inject mail to the centralized postfix server via the cleanup daemon. However, we want to allow only our authorized servers to connect to the cleanup daemon. The current configuration allows any host to connect to port 2526. Clearly we can use iptables to restrict access, but is there a way to do this within postfix itself?

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• How to change the setting for a network device reported by ethtool, specifically Speed, on VM?

  - by Ramadheer Singh

  This is related to these two questions, although they don't answer my question. The machines are RHEL6. 1.ethtool not showing all the properties 2.changing network speed to 1000Mb/s Output on VM: [root@foo ~]# ethtool eth0 Settings for eth0: Current message level: 0x00000007 (7) Link detected: yes Output on Real Hardware: (interested in Speed) # ethtool eth0 Settings for eth0: Supported ports: [ TP ] Supported link modes: 10baseT/Half 10baseT/Full 100baseT/Half 100baseT/Full 1000baseT/Full Supports auto-negotiation: Yes Advertised link modes: 10baseT/Half 10baseT/Full 100baseT/Half 100baseT/Full 1000baseT/Full Advertised auto-negotiation: Yes ***Speed: 1000Mb/s*** Duplex: Full Port: Twisted Pair PHYAD: 1 Transceiver: internal Auto-negotiation: on Supports Wake-on: d Wake-on: d Link detected: yes if there's anyway I can set this in VM, please suggest.

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• Seeking recommendations on resolving sporadic network connectivity latency for Notes client

  - by Russell Maher

  I have Domino servers in geographically disperse data centers in the U.S. Sometimes when I open an NSF on one of those servers the connection times out then when I open the NSF again it connects immediately. This has been going on for years and during that time I have upgraded and changed my own internet connection and moved servers to different data centers. Of course I have direct connection documents using fixed IP addresses. When I do a Notes client Trace nothing is out of the ordinary. My business partner experiences the same thing from an entirely different city and different ISP but to the same servers. Never have any trouble connecting to the HTTP server, just over port 1352. Does anyone have any recommendations on a process to determine what is causing this problem?

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• What is the "real" difference between a NAS and NFS? Or, why pick a NAS device over "mere" NFS?

  - by warren

  From an end-user perspective, what is the difference between a NAS device and using NFS exports from a file server? They seem to accomplish the same end result. The difference between a SAN and other file storage is related (in my experience) to how they are connected to the server infrastructure. However, the difference between a NAS, connecting over a standard ethernet port, and NFS (sharing storage off specific servers, also over the network), seems more nebulous. Is there a good reason to pick a NAS filer over just running NFS on servers?

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• Clarification of the difference between PCI memory addressing and I/O addressing?

  - by KevinM

  Could someone please clarify the difference between memory and I/O addresses on the PCI/PCIe bus? I understand that I/O addresses are 32-bit, limited to the range 0 to 4GB, and do not map onto system memory (RAM), and that memory addresses are either 32-bit or 64-bit. I get the impression that memory addressing must map onto available RAM, is this true? That if a PCI device wishes to transfer data to a memory address, that address must exist in actual system RAM (and is allocated during PCI configuration) and not virtual memory. So if a PCI device only needs to transfer a small amount of data at a time, where there is no advantage to putting it into RAM or using DMA, then I/O addressing is fine (e.g. a parallel port implemented on a PCI card). And why do I keep reading that PCI/PCIe I/O addressing is being deprecated in favour of memory addressing? Thanks!

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• Out of nowhere, ssh_exchange_identification: Connection closed by remote host

  - by disusered

  I am running Ubuntu 10.10 on a remote box. I ssh to it everyday without issues but today out of the blue, I get the following error: ssh_exchange_identification: Connection closed by remote host If I connect with -vv, I get the following: OpenSSH_5.6p1, OpenSSL 0.9.8r 8 Feb 2011 debug1: Reading configuration data /Users/bla/.ssh/config debug1: Applying options for ubuntu-server debug1: Reading configuration data /etc/ssh_config debug1: Applying options for * debug2: ssh_connect: needpriv 0 debug1: Connecting to ubuntu-server.com [123.123.123.123] port 22. debug1: Connection established. debug2: key_type_from_name: unknown key type '-----BEGIN' debug2: key_type_from_name: unknown key type '-----END' debug1: identity file /Users/bla/.ssh/id_rsa type -1 debug1: identity file /Users/bla/.ssh/id_rsa-cert type -1 ssh_exchange_identification: Connection closed by remote host If I remove the key, I get the exact same output (sans "debug2: key_type_...). I've managed to log in physically and checked my hosts.allow and hosts.deny but they have no entries. I tried removing and reinstalling OpenSSH, checked authorized_keys and ~/.ssh permissions and tried connecting from other computers only to get the same error. I'm at my wits end, any help would be greatly appreciated.

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• Connecting via url to a server that is on the same network as me

  - by Axehead

  Good day, I'm having problems with the ftp server I've just set up. I've already managed to configure my modem and wireless router to open up port 21 and setup ftp in my server. But It seems that when I try to connect to it when I'm in the same network as the server via URL, (ftp://mydomain.com) it redirects me to the modem's web interface. But then when I try to connect to it outside the network using a different internet connection. It succeeds. It also succeeds when I'm in the same network and I go to ftp://192.168.., the server's local IP. Am I supposed to adjust something in the modem or router? Or is this a different problem altogether? BTW I'm using Windows Server 2008 r2 as my server's OS and using IIS for ftp.

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• Time Capsule + Ubee Router?

  - by Charlie

  I can't for the life of me figure this out. I recently had TWC installed in my house, and wanted to disable the NAT and router functions of it. I have a Time Capsule hooked up to it from LAN1 (on the Ubee) to the WAN port on the TC. The problems started occurring here. I figured the settings would be these: Ubee Configuration mode: Bridge DHCP: Off TC IPv4: 192.168.100.2 Subnet Mask: 255.255.255.0 Router Address: 192.168.100.1 DNS Servers: 8.8.8.8, 8.8.4.4 Router Mode: DHCP and NAT But using those settings, my TC says "Double NAT", so I have to change it all around to the default settings of the Ubee using NAT. This leads me to believe bridge mode doesn't actually turn off NAT...

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• Cannot SSH into Virtual Machine

  - by MasterGberry

  I am running a CentOS VM on my desktop that I use for development testing when coding in python. At my school I have a dedicated IP setup for the VM and my desktop so I never seem to have an issue ssh'ing from desktop into VM. I am now at home for winter break and cannot seem to SSH into the VM using the local ip address behind my router, the external IP with port 22 forwarded to my VM, or anything. Strangely enough I can ssh into my production server and then fromt here ssh into the VM, but not from my desktop to the VM directly What should I do to get this to work? Thanks

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• Other computer can't connect to MySQL Database

  - by user23950

  I have a VB .NET program the uses a MySQL database. It works when the computer that has WAMP installed is the one running the program. The same program now displays an Unhandled Exception error when the computer it's running on does not have WAMP installed (and running). The only thing that is installed is the MySQL connecter net. How can I make this work? I have already tried opening port 20 by configuring the firewall. I did this for both TCP and UDP.

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• Activating ssl on tomcat

  - by toom

  I want to encrypt the http traffic on a tomcat instance via ssl. Therefore I followed the most simplistic approach described on various webpages. But anyway it simply does not work. Here is what I did: "keytool -genkey -alias tomcat -keyalg RSA" and I enterd "changeit" as the password (since this is the defaut chosen by tomcat) Altering $CATALINA_HOME/conf/servers.xml by uncommenting the following line Connector port="8443" protocol="HTTP/1.1" SSLEnabled="true" maxThreads="150" scheme="https" secure="true" clientAuth="false" sslProtocol="TLS"/ Restarting tomcat Entering https://localhost:8443 does not work. However, I can still access the page via normal http like http://localhost:8080 The logfile does not contain any suspicious information. What is going wrong here?

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• MySQLInstance Configuration

  - by Tuga

  Hi guys, i am using this line to configure MySQL 5.1 MySQLInstanceConfig.exe -i -q -lmysql_config.log ServerType=SERVER DatabaseType=MIXED ConnectionUsage=DSS Port=3306 AddBinToPath=yes ConnectionCount=10 SkipNetworking=no StrictMode=no RootPassword=password it configures the server and the service is started fine, but the StrictMode is enabled even though i am disabling it in the configuration above... if i look at my.ini i find Set the SQL mode to strict sql-mode="STRICT_TRANS_TABLES,NO_AUTO_CREATE_USER,NO_ENGINE_SUBSTITUTION" which i think is not supposed to be there... am doing anything wrong? i am using the parameter wrong? Vladimir,

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• Is there a feature in Nagios that allows Memory between checks?

  - by Kyle Brandt

  There are various instances where there are values I want to monitor with Nagios, and I don't care as much about the value itself, but rather how it compares to the previous value. For instance, I wrote one to check the fail counters in OpenVZ. In this case, I didn't care about the value that much, but rather I cared if the value increased. Another example might be switch ports, I would be most interested to get alerted about the change of state of a port (Although perhaps a trap would be better for this one). For my OpenVZ script, I used a temp file, but I am wondering if there is a better way? Maybe Nagios has some variables that plugins (check scripts) can access that are persistent across checks?

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• How to disable screens turn off Windows 8.1

  - by Warpzit

  So recently my computer started turning my screen monitors off after a while without activity, if I move the mouse or hit the keyboard they turn back on. I just want them to stay on. My System is windows 8.1 64 bit, I have 2 screens with mini display port and 1 television with hdmi which often is in regular television mode when this issue happens. Now before you jump to conclusions this is what I've tryed: Disabled screen saver Power saving settings to high with following set: Turn of the display: Never Put the computer to sleep: Never Turn off hard disk after: Settings: Never Sleep: Sleep after: Settings: Never Display: Turn off display after: Settings: Never Display: Enable adaptive brightness: Settings: Off Multimedia settings: When sharing media: Settings: Prevent idling to sleep. Any pointers that get me in the right direction will be greatly appreciated.

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• What's the best multiple monitor setup I can buy for $500 and a macbook?

  - by kevinburke

  I've got a 13' white MacBook from 2008 and I'd like to run one or two external monitors, my budget is $500. I've tried to do research and this is what I was going to get - will these work OK? Two Diamond BVU195 HD USB Display Adapters (DVI and VGA with included DVI to VGA adapter) to plug into the USB port Two Dell ST2310 monitors One external USB hub so I don't use up both of my USB ports Will this work? I've read some people say it does and some people say it doesn't, but I don't know enough to say either way. Also do you have recommendations for a better monitor than the dell sd2310? what's the best setup I can buy for $500? Thanks very much for your help, Kevin

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• Filtering downloading a file

  - by Ozgun Sunal

  people. i know there are several types of firewalls operating at different layers of OSI. ACLs(layer 3 firewalls filter based on port numbers and IP addresses), SPI(which examines the patterns of data at layer 3 and realise that data content is malicious or not) and application layer firewalls which is capable of understanding the data at that level. Considering this, i'll give an example and learn what i need to do. Lets say, we have a computer has access to the Internet. i want to download a file or display a web page from a website but block access to the another website/s or downloading. To do this, i cant block access to the web browser on the 3rd party firewall bcos that will shut down all access. ACLs wont already do it. So, which kind of firewall will make it possible to filter specific traffic and how?

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• Starting Apache through XAMPP is not working

  - by nogamo

  I've checked the error logs for this particular problem and it seems no access can be made to port 80. (OS 10013)An attempt was made to access a socket in a way forbidden by its access permissions. : make_sock: could not bind to address [::]:80 Turning the Windows firewall off didn't work, so I'm a bit lost. All of this is running on my laptop so I don't have my own "server" per se but I was under the impression that this would work without the need for one independent of my own personal computer. How would I solve this?

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• Two routers in a LAN

  - by taxi

  router A no wifi +--- pc01 +--- pc02 | +--- router B wifi +--- pc03 +--- printer In my LAN I have a modem-router (say A) (no wifi connection) acting as DHCP server, and connected to the Internet. Now, I want to add another router (say B) (with wifi connection) to the LAN, in order to connect wifi pc's and net printers. Here I would disable DCHP server functionality. Is it correct to connect router B to router A via an ethernet port? In router A I define an IP address (eg 192.168.1.100) to be assigned to router B (MAC address). I expect to see router B listed as an attached device, in router A's status, but on the contrary it is not listed.

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