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• Colocation and HSRP setup

  - by WinkyWolly

  My colocation provider has setup HSRP for us and has provided us 2 drops (plugged into 1/1/1 and 1/1/2) from their routers as well as a /29 with 2 HSRP IP's and the rest of the /29 usable for the switch. I know that HSRP should be pretty much plug and play as long as the ports are in the same VLAN. However I'm confused as to how to the IP setup should work. Currently I've assigned port 1/1/1 the full /29 however I think this is incorrect because if I were to unplug it port 1/1/2 wouldn't work as it has no IP assignment. What's the proper way to do this?

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• Upgrading HP DL185 G5 8LFF, is using a Dell J1520 4-Drop SATA Adapter possible?

  - by jpreed00

  The HP DL185 G5 8LFF model supports 8 3.5" drives and 1 optical drive. However, instead of the optical drive, I'd like to have 2x 2.5" drives instead. The problem is that the PSU has no more SATA power cables (even though the motherboard has 4 additional SATA data ports). The PSU does have a free 10-pin connector and it looks like the J1520 cable from Dell would fit the bill. Link to cable description Does anyone have any experience using these cables? Are they safe? Any other ideas for adding the disks to the server if I don't use the cable? Thanks!

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• Cloud services can't be reached from complex customer infrastructure

  - by Nock

  We have several services running on a cloud, they all are hosted on Windows Server 2012 R2, have public IP address and specific port. Some of our customers can't reach them because for "some reason" the ports are cut between a firewall between them and us. (some customers are using a shared internet connection in a multi tenant office and they can't change firewall communication) Well, you get it, we don't have the possibility to make all the firewall "allowing" the communication. My customers all runs Windows 7 at least. What is the best counter solution in such case, using Microsoft (Windows Server) technologies? The best would be some kind of tunneling communication or VPN, but the customer should also be able to access his/her enterprise resources. Bby the way, today we using IPSec using Windows Firewall to secure the communication, is IPSec tunneling a solution for us? Otherwise, is there a service in Windows to enable some kind of VPN between a client and a server but only for a given set of servers?

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• Connect iPad to windows 7 VPN

  - by Linuz

  My iPad keeps spitting out the error: "A connection could not be established to the PPP server." I am trying to connect it to a VPN I set up with Windows 7 as an incoming connection. On the iPad, I went into the VPN settings, added a new PPTP VPN with the following information Server: Windows 7 Computer's IP RSA SecurID: OFF Account: Account Username Password: Account Password Encryption Level: Auto Send All Traffic: ON Proxy: Off Now I know that it is making some connection to the Windows 7 Computer because whenever I intentionally put in the wrong VPN password on the iPad, it makes me put in the correct one before trying to connect again. All the ports are forwarded on my router for PPTP, and my Windows 7 Firewall is even off to try to get this to work. Any help would be greatly appreciated, thanks.

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• Why does my USB stick not show up in Windows Vista?

  - by Kjensen

  Just reinstalled a Lenovo laptop with Vista. Two separate USB sticks, that work fine on another computer, will not show up on this Vista computer. USB ports work fine for other stuff. USB sticks worked before I reinstalled the computer. After looking around, I tried going into Disk management, to see if they appear there - they don't. Is there some sort of service, that might be disabled, not allowing removable drives to mount? Or what else can be wrong?

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• Iptables REDIRECT + openvpn problem

  - by Emilio

  I want to redirect connection to port 22 to my openvpn binded port, on 60001. Openvpn is running on server on 60001 server:~$ sudo netstat -apn | grep openvpn udp 0 0 67.xx.xx.137:60001 0.0.0.0:* 4301/openvpn I redirect on server port 22 to 60001 server:~$ sudo iptables -F -t nat server:~$ sudo iptables -A PREROUTING -t nat -p udp --dport 22 -j REDIRECT --to-ports 60001 I start openvpn client (openvpn.conf is correct, it works with remote IP 22 replaced with remote IP 60001) client:~$ ./openvpn openvpn.conf Tue Apr 27 00:42:50 2010 OpenVPN 2.1.1 i686-pc-linux-gnu [SSL] [EPOLL] built on Mar 23 2010 Tue Apr 27 00:42:50 2010 UDPv4 link local (bound): [undef]:1194 Tue Apr 27 00:42:50 2010 UDPv4 link remote: 67.xx.xx.137:22 Tue Apr 27 00:42:52 2010 read UDPv4 [ECONNREFUSED]: Connection refused (code=111) Tue Apr 27 00:42:55 2010 read UDPv4 [ECONNREFUSED]: Connection refused (code=111) ... It doesn't connect. iptables shows requests from client to server but no answers. What's wrong with it?

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• Can ping/nmap server, nothing else

  - by lowgain

  I was SSHed into our ubuntu LAMP server , and was just doing a svn update, which hung. I disconnected, and since then, I have not been able to SSH in or view any of our websites (neither from my network or through a remote machine). I would have just assumed the server went down, but I can ping the machine and get really quick responses. Using nmap on the box shows all the normal ports open, so I am confused This server is hosted remotely in a datacenter, do I have any remaining options except contacting them for support? Thanks!

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• Problem running application on windows server 2008 instance using amazon ec2 service and WAMP

  - by Siddharth

  I have a basic (small type) windows server 2008 instance running on amazon ec2. I've installed WAMP server on to it, and have also loaded my application. I did this using Remote desktop Connection from my windows machine. I'm able to run my application locally on the instance, however when I try to access it using the public DNS given to it by amazon, from my browser, I'm unable to do so. My instance has a security group that is configured to allow HTTP, HTTPS, RDP, SSH and SMTP requests on different ports. In fact I have the exact same security group as the one used in this blog, http://howto.opml.org/dave/ec2/ I did almost everything same as the blog, except for using a different Amazon Machine Image. This is my first time using amazon ec2, and i can't figure out what I'm doing wrong here

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• Can I mix CAT5 and CAT6?

  - by Jason94

  I'm thinking of upgrading the "backbone" of my network, taking a CAT6 cable from my router (DLINK DIR-655 (has cat6 ports)) to a gigabit swith in the tv rom (25m). I have two devices there that uses network (xbox and tvbox, both of them have cat5). Will my net be downgraded to 100mbit as max speed, or will I get 1 gigabit between my router and switch, and 100mbit between tvbox and xbox? From back in the days i have a tool to create my cat5 cable (the plug tool thingy), can I use this for my cat6 too?

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• Is it effective installing firewall within same machine which offering service?

  - by Eonil

  I'm a starting a small service practically. And I have single server currently. No money to purchase separated/dedicated firewall equipment now. Is it effective installing firewall software on same machine which offering internet service? My server will offer HTTP, NFS, and SSH, and custom made server software on a several ports. (edit) All services (except NFS) should be open to internet. Not internal services. I guess my machine (virtualized within Xen) is connected to the internet directly because I can connect to my machine SSH with only IP address. (edit) NFS is not open to internet. Sorry for my mistake. NFS will be served via SSH only.

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• Does Apache 2.2 (windows) have any default bandwidth limit?

  - by igino manfre'

  I'm running Apache on a server in cloud (Windows server 2008 R2 on VMware, 1 Gbps of BW, http://95.110.164.61 ). I'm streaming many live DVB MPEG Transport Stream, precompressed in loop, (not flash) generated by VLC on port 640xx and then reverse proxied by Apache on port 80. The server's firewall is open for VLC and Apache on all ports. Above 1.5 Mbps the reproduction is affected by continous stop & go. Please note that if you request a stream generated by VLC directly at http://95.110.164.61:64087/mpg2_6.4 you see a correct stream, while if you request http://95.110.164.61/mpg2_6.4 you do not. I know that Flash streaming Server uses Apache to stream on port 80 (and it works). I'm not an expert with Apache, can anyone tell me if any "special" module is required to increase the bandwidth?

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• Remote connection to dynamic public ip & private ip addresses

  - by user51737

  Many times I connected to windows computer which has static public ip address via remote desktop over wan links. I'm wondering how could I connect to the remote computer that has dynamic public ip address & private ip addresses assigned. I've 2 systems at home: xp system-------connected to internet(dynamic public ip) & allowed other users to connected to the internet on the interface. windows vista system--------enabled dhcp on the interface to access internet from xp. How could I remotely connect from my office to the 'vista system'?. If I've a router/modem at my home it may be possible to allow the ports for the system but I don't. Any tips?

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• TCP > COM1 for receiving messages and displaying on POS display pole

  - by JakeTheSnake

  I currently have a Java Applet running on my web page that communicates to a display pole via COM1. However since the Java update I can no longer run self-signed Java Applets and I figure it would just be easier to send an AJAX request back to the server and have the server send a response to a TCP port on the computer...the computer would need a TCP COM virtual adapter. How do I install a virtual adapter to go from a TCP port to COM1? I've looked into com0com and that is just confusing as hell to me, and I don't see how to connect any ports to COM1. I've tried tcp2com but it doesn't seem to install the service in Windows 7 x64. I've tried com2tcp and the interface seems like it WOULD work (I haven't tested), but I don't want an app running on the desktop...it needs to be a service that runs in the background. So to summarize how it would work: Web page on comp1 sends AJAX request to server Server sends text response to comp1 on port 999 comp1 has virtual COM port listening on port 999, sends data to COM1 pole displays data

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• Network Block Device (NBD) clients for Windows or similar solutions

  - by przemoc

  Are there any NBD clients for Windows? Strangely, I cannot find any, or I am searching for them in a wrong way. Such client should be possibly a driver with front-end tool (may be a command-line one) allowing to create virtual drives and associate them with given hosts (or simply localhost) and ports where NBD servers are listening. From user perspective virtual drive should be close to what physical drive is, so it should be accessible as something like \\.\PhysicalDriveX (maybe \\.\VirtualDriveX?), be visible in Disk Management (diskmgmt.msc) and mountvol tools at least. (The only thing I found remotely close to NBD on Windows is ImDisk's proxy mode and companion tool devio, but AFAIK ImDisk only works at partition level (so no virtual drive) and devio uses different protocol.) Secondary question is: Are there any (preferably simple) Windows-specific solutions allowing creation of virtual drive delegating read/write request to user-space via some explicit way (like via TCP, IPC, DLL implementing given API, etc.)?

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• How to charge an iPhone on a Windows PC without Installing iTunes

  - by Martin Hollingsworth

  I want to be able to charge my iPhone on my work computer, which is running Windows Server 2008 SP1 64-Bit. When I plug the iPhone in with the USB cable, it will not charge. Windows attempts to locate a driver for the device but only comes up with a generic Camera device and even if I allow that to be installed, the iPhone still does not charge. I have checked the computer's BIOS settings and did not find anything relating to power on the USB devices. I also tried this on ports at the back of the computer in addition to those on the front. The PC is a Dell Optiplex 780. As far as I can tell USB devices do not charge unless Windows has installed an appropriate driver. Since it is a work computer I do not want to install iTunes which does include a driver. I have a workaround that I will post as an answer for reference.

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• Thin web server - single or multiple instances per IP address:port?

  - by wchrisjohnson

  I'm deploying a rack/sinatra/web socket app onto several servers and will use thin as the web server (http://code.macournoyer.com/thin/). There are almost no views to show, so I am not front-ending it with a traditional web server like Apache or nginx. In general, you see thin started and the underlying config file for it has the number of server instances to start, say 3, and the port to start with, say 5000. So, in my example, when thin starts, it starts up three instances on a range of ports, starting on port 5000. If I have a series of virtual machines, say 3, 6, 9, etc. that I treat as a cluster, would/should I choose to start a single thin instance on each VM, or multiple instances on each VM? Why? Thanks - Chris

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• Firewall still blocking port 53 despite listing otherwise?

  - by Tom

  I have 3 nodes with virtually the same iptables rules loaded from a bash script, but one particular node is blocking traffic on port 53 despite listing it's accepting it: $ iptables --list -v Chain INPUT (policy DROP 8886 packets, 657K bytes) pkts bytes target prot opt in out source destination 0 0 ACCEPT all -- lo any anywhere anywhere 2 122 ACCEPT icmp -- any any anywhere anywhere icmp echo-request 20738 5600K ACCEPT all -- any any anywhere anywhere state RELATED,ESTABLISHED 0 0 ACCEPT tcp -- eth1 any anywhere node1.com multiport dports http,smtp 0 0 ACCEPT udp -- eth1 any anywhere ns.node1.com udp dpt:domain 0 0 ACCEPT tcp -- eth1 any anywhere ns.node1.com tcp dpt:domain 0 0 ACCEPT all -- eth0 any node2.backend anywhere 21 1260 ACCEPT all -- eth0 any node3.backend anywhere 0 0 ACCEPT all -- eth0 any node4.backend anywhere Chain FORWARD (policy DROP 0 packets, 0 bytes) pkts bytes target prot opt in out source destination Chain OUTPUT (policy ACCEPT 15804 packets, 26M bytes) pkts bytes target prot opt in out source destination nmap -sV -p 53 ns.node1.com // From remote server Starting Nmap 4.11 ( http://www.insecure.org/nmap/ ) at 2011-02-24 11:44 EST Interesting ports on ns.node1.com (1.2.3.4): PORT STATE SERVICE VERSION 53/tcp filtered domain Nmap finished: 1 IP address (1 host up) scanned in 0.336 seconds Any ideas? Thanks

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• Logs being flooded from Squid for having intercepted and authentication enabled together

  - by Horace

  I have done some hefty Google'ing and I can't seem to find a single solution to this issue that I cam currently experiencing. Here is a sample configuration from squid that I have: # # DIGEST Auth # auth_param digest program /usr/sbin/digest_file_auth /etc/squid/digpass auth_param digest children 8 auth_param digest realm LHPROJECTS.LAN Network Proxy auth_param digest nonce_garbage_interval 10 minutes auth_param digest nonce_max_duration 45 minutes auth_param digest nonce_max_count 100 auth_param digest nonce_strictness on # Squid normally listens to port 3128 # Squid normally listens to port 3128 http_port 192.168.10.2:3128 transparent https_port 192.168.10.2:3128 intercept http_port 192.168.10.2:3130 As noted above, I have three ports defined, 2 of them are transparent/intercept and one is a regular http port (which I use for authentication). Which works rather well in this configuration however my logs are getting flooded of this entry authentication not applicable on intercepted requests whenever a transparent connection is made. So far, I can't seem to find any documentation that would describe how to suppress these messages ?

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• Can Ping but Cannot Telnet directly to SQL Server 2012 Cluster Nodes

  - by tresstylez

  We have a monitoring tool (Solarwinds Orion) that needs to connect to a 2-node failover SQL Server Cluster. For reasons outside of our control -- we cannot monitor the CLUSTER IP directly at this time, so we have fallen back to monitoring each cluster node IP directly. This is not working. Upon troubleshooting, we tried to test that the cluster node was listening on the proper (fixed) port by using telnet to the cluster node IP/port -- and the telnet failed. However, telnet'ing to the Cluster IP/Port was SUCCESSFUL! Each node has its own IP. Each node is listening on the identical FIXED port. Each node has Dynamic Ports disabled. Each node can be PINGED successfully from the monitoring tool. Windows Firewall is DISABLED. How can I troubleshoot why I cannot telnet to the listening port on the cluster nodes?

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• Can I re-attach SSH key forwarding through a disconnected Screen session?

  - by David Mackintosh

  I have a laptop on which I have pageant (the PuTTy SSH key agent) running. If I ssh to a system and launch screen, the ssh key forwarding works properly. However, if I disconnect from that screen session, log off, then later reconnect -- the key forwarding doesn't work any more. I am presuming that this is because when I reconnect the key forwarding is set up on different ports for the new ssh session than was the old one. Is there a way to teach an individual screen window to reconnect to the agent forwarding so that I can use my key to forward again?

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• Why do some machines respond with many RST packets instead of RST-ACK to refuse a connection?

  - by Michael J. Gray

  I have recently been trying to track down a problem with one of our systems and have noticed that it is simply not allowed to connect to a remote machine. However, the remote machine (not controlled by us) is responding to our request for a connection with many TCP RST packets on a different port (26469, 26497, 26498) than the one we originated on (53). It simply wouldn't let up at one point and flooded us with about 10 packets/second for an hour or two of only RST on those obscure high ports. Out of the thousands of nodes we're connecting to, this is the only one ever to show this behavior. What could possibly cause this? EDIT Below is a screenshot of Wireshark when it happened. I don't have the actual dump anymore and can't reproduce this specific scenario every time. Basically, we sent a SYN and immediately got RST on an odd port and so we respond with RST and just keep going back and forth.

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• PHP script unable to email on OpenBSD Apache

  - by MattC

  I have a webserver running OpenBSD 4.7 and PHP 5.2.12 out of the ports tree. There is a small contact page that is supposed to send an email to a specific address. When I fill in the form using a web browser, it sends the AJAX request to the PHP page which claims it worked successfully but there is no email. The maillog is empty as well. I created a small php script that replicates this functionality and when I run it by hand using the "php -f" command, it sends an email without a problem. I think this has to do with being chrooted but I can't seem to get it to work. Furthermore, I can't seem to get PHP to log. I told it to log to /var/www/logs/php_errors.log and restarted but can't get it to send anything to the file. Does anyone have any tips for debugging these sort of things in OpenBSD?

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• How to configure a static wildcard subdomain with dnsmasq.

  - by Prody

  I have a network behind a NAT with a few machines. The machines are: router - NAT, dnsmasq, forwarding - directly connected to the inet server - which runs ssh, www and some other stuff clients - which do stuff on server I also have mydomain.com. server.mydomain.com is pointing to my connection's IP (single IP), which is the router, which forwards ports to server. Server, has a httpd running, which serves different sites based on vhosts. So I have site1.server.mydomain.com, site2.. The problem is that all the traffic is going thru the router, and when I check logs I always see the router's IP for everything (so it's hard to see who is running the script with the while(1)). I would just ServerAlias site1.server.local, but most of the sites have a root URL saved somewhere on top of which other URLs are built, so I can't do that. The solution for me would be telling dnsmasq somehow to answer to *.mydomain.com with server's IP. Is this possible somehow?

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• nginx + reverse proxy question

  - by Joe Pilon

  Hello, I am using nginx right now for our production sites with the reverse proxy to apache that's on the same server and it works fantastic. I'm wondering if I can do this: Install nginx on box #1 in say Canada and have it reverse proxy http requests to box #2 in a datacenter in the USA. I know there may be some latency or delays in loading the page etc but that would probably be not noticable to the end user especially if both servers have 100mb ports. Box #2 only does the apache requests, all images are served from box #1 via nginx. Now, would the end visitor be able to tell in any which way that there are 2 boxes being used? Box #2 has sensitive data which we can't have stolen in the event of hacking etc, so this method helps keep things a bit more secure. Anyone know if this is possible or have done something similar?

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• Installing CentOS 6.3 wrong hard drives order?

  - by Ken Tang

  I am trying to install CentOS 6.3 on new server that has 2xSSD and 1xHDD drives connected to mainboard's SATA ports by following order: SSD1 -> SATA1 SSD2 -> SATA2 HDD1 -> SATA3 On the installation process CentOS shows me hard drives by this order: /sda -> that is actually SSD2 /sdb -> HDD1 /sdc -> SSD1 It looks like CentOS assigns it randomly rather by the SATA connection order. My question is: What the order of drives /sd* depending on? And how can I change it to be by the order it connected to SATA? Thank you in advance!

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