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  • Client-server application between two computers in the same network (using boost::asio)

    - by Edwin
    I'm trying to set up a basic communication between my desktop PC and my laptop (latter one using wireless connection) both being in the same network, using the boost::asio tutorials: synchronous client and synchronous server (in c++). When I run both the server and client on the same machine (using the localhost and the datetime port as parameters), it works splendidly. But if I try to set up the laptop as server (tested it with netstat -anb from the command prompt, it is indeed running and listening to port 13 as it's supposed to, and I even deactivated the firewall to make sure it doesn't cause any problems), I cannot connect to it with the client (set up on the PC), no matter what IP I tried (localhost, and basically any IPs that ipconfig -all gave me). So no matter what I tried, I cannot find the correct address that which the client can use to connect to the server. Could anyone help me please?

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  • Register a dll in Windows Server 2003

    - by Karee
    I'm trying to register some DLLs for a particular application but having some problems. The DLLs are stored in the application folder in the D: drive. I run cmd.exe, go to the D: drive and run regsvr32, but it gives me the error: "The was loaded, but the DllRegisterServer entry point was not found. This file cannot be registered." After searching for other solutions, I also tried copying the DLLs into the C:\WINDOWS\system32 folder and running regsvr32 directly there but that didn't work either. It gave me the same error. I'm not very familiar with Windows Administration, so I may need detailed instructions/explanations. Any help would be greatly appreciated! Thank you very much!

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  • Hyper-V Deployment Options Best Practices

    - by Erv Walter
    In what circumstances would you choose each of the following deployment options: Hyper-V installed as the bare bones Windows Hyper-V Server 2008 R2 Hyper-V role installed on a Windows Server 2008 R2 Server Core installation Hyper-V role installed on a Windows Server 2008 R2 Full Installation For example, I know there are licensing considerations for each option: With Hyper-V on top of a full installation of Enterprise or Data Center edition, you can use Windows Server as a guest OS without needing additional licenses (4 for Enterprise, unlimited for Data Center) With "Windows Hyper-V Server" you have to obtain licenses for each guest OS. But my real question is, are there technical considerations as well? I understand that the Full Installation doesn't perform as well as the other two options, but is there a significant difference between Server Core and "Windows Hyper-V Server"? What are the pros and cons of Hyper-V on Server Core vs "Windows Hyper-V Server" and when would you choose each?

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  • Secure iptables config for Samba

    - by Eric
    I'm trying to setup an iptables config such that outbound connections from my CentOS 6.2 server are allowed ONLY if they are of state ESTABLISHED. Currently, the following setup is working great for sshd, but all the Samba rules get totally ignored for a reason I cannot figure out. iptables Bash script to setup ALL rules: # Remove all existing rules iptables -F # Set default chain policies iptables -P INPUT DROP iptables -P FORWARD DROP iptables -P OUTPUT DROP # Allow incoming SSH iptables -A INPUT -i eth0 -p tcp --dport 22222 -m state --state NEW,ESTABLISHED -j ACCEPT iptables -A OUTPUT -o eth0 -p tcp --sport 22222 -m state --state ESTABLISHED -j ACCEPT # Allow incoming Samba iptables -A INPUT -i eth0 -s 10.1.1.0/24 -p udp --dport 137:138 -m state --state NEW,ESTABLISHED -j ACCEPT iptables -A OUTPUT -o eth0 -d 10.1.1.0/24 -p udp --sport 137:138 -m state --state ESTABLISHED -j ACCEPT iptables -A INPUT -i eth0 -s 10.1.1.0/24 -p tcp --dport 139 -m state --state NEW,ESTABLISHED -j ACCEPT iptables -A OUTPUT -o eth0 -d 10.1.1.0/24 -p tcp --sport 139 -m state --state ESTABLISHED -j ACCEPT # Enable these rules service iptables restart iptables rule list after running the above script: [root@repoman ~]# iptables -L Chain INPUT (policy DROP) target prot opt source destination ACCEPT tcp -- anywhere anywhere tcp dpt:22222 state NEW,ESTABLISHED Chain FORWARD (policy DROP) target prot opt source destination Chain OUTPUT (policy DROP) target prot opt source destination ACCEPT tcp -- anywhere anywhere tcp spt:22222 state ESTABLISHED Ultimately, I'm trying to restrict Samba the same way I have done for sshd. In addition, I'm trying to restrict connections to the following IP address range: 10.1.1.12 - 10.1.1.19 Can you guys offer some pointers or possibly even a full-blown solution? I've read man iptables quite extensively, so I'm not sure why the Samba rules are getting thrown out. Additionally, removing the -s 10.1.1.0/24 flags don't change the fact the rules get ignored.

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  • Allowing access to subnets openvpn access server

    - by user3882976
    I have a centos server running a openvpn access server. On that server I am running a windows server in virtual box. On the centos server I am running the vpn with a network address 172.27.224.0 with 20 bits. The windows server is running a dchp server giving ip's of 192.168.1.0-200. When i try to connect to the widows shared folder from the vpn i can't using the name of the server but i can from the ip.

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  • APC switched rack PDU: Startup outlet state

    - by Ian Gregory
    I have an APC Switched Rack PDU powering a number of servers in a remote datacentre. After a recent power outage, I noticed that the outlets did not automatically default to the On status once power was restored. Having reviewed the Web UI, I cannot find this option. I'm not certain of the model number (it doesn't appear to be visible in the Web UI), but I think it's this one. Is it possible to configure these PDU units to automatically power outlets after a cold start?

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  • active directory servers synchronization

    - by Mit Naik
    I have 3 AD servers with windows server 2008 R2 at 3 different places, main server is at datacenter and 2 are in our local office which are at 2 different place. I want to synchornize all the 3 server together, were datacenter server should be central server and rest 2 servers should synch with the datacenter server. Please provide us the steps or tutorial to do this. Also we want that once the changes are done in 1 of the AD server the changes are automatically done in all the servers. For example if I change the password of user in our local server it should be updated in our main AD server and other branch server too. Please provide us the steps or tutorial to do this asap. I have one more question I have already created main datacenter AD as domain.local and other domains as xyz.local and abc.local, how can I replicate the additional AD domains with main datacenter DC, also do we require VPN connection, is there any other way to replicate the servers without using VPN connection?

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  • I am unable to run a client/server program in php

    - by sibi
    This is the program I am trying to run: $host = "127.0.0.1"; $port = 25003; // don't timeout! set_time_limit(0); // create socket $socket = socket_create(AF_INET, SOCK_STREAM, 0) or die("Could not create socket\n"); // bind socket to port $result = socket_bind($socket, $host, $port) or die("Could not bind to socket\n"); // start listening for connections $result = socket_listen($socket, 3) or die("Could not set up socket listener\n"); // accept incoming connections // spawn another socket to handle communication $spawn = socket_accept($socket) or die("Could not accept incoming connection\n"); // read client input $input = socket_read($spawn, 1024) or die("Could not read input\n"); // clean up input string $input = trim($input); echo "Client Message : ".$input; // reverse client input and send back $output = strrev($input) . "\n"; socket_write($spawn, $output, strlen ($output)) or die("Could not write output\n"); // close sockets socket_close($spawn); socket_close($socket); I enabled the PHP_socket option in WAMP but still I keep getting errors like unable to bind. Can someone please help me out?

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  • Could it be sane to use Windows Server 2012 as desktop

    - by nCdy
    what about using it on desktop? I've got enough strong PC with intel core i7 and 8GB Ram so what should I think about: why not? Were looking about major differences compared to windows 8, found less. for example new file system - can it affect me? In my usual day I need development instruments alike visual studio, virtualization tools, and some games So far I can't find something that must stop me, everything I need can work (seems like) there. Tell me why I must not do it or if that is sane to do.

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  • Grub Error 18 - Solid State Drive

    - by clint
    I recently used Raw Copy to make an image of my 300gb Raptor Hd to a OCZ Vertex SSD 60GB. And When I pluged in the SSD to boot I get a Grub Error 18. I have tried to changed in the BIOS setting to LBA, Large, Auto, trying different combination's. Any advice. thanks, Clint

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  • wusa in server 2008 R2

    - by Jack
    I need to use wusa to uninstall a particular update that is causing a reboot loop. I can access winre and dism, but wusa gives command not found. Does wusa not come with r2, or is it not available in the built-in WinRE or what?

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  • Windows Server 2003 Terminal Services error

    - by Adrian S
    Hi! I have a Win2K3 machine which I want to access via remote desktop. When I try remote desktop on another machine the session just ends as soon as it attempts connection. I never see the log-on sceeen or anything. It just returns to the remote desktop connection dialog. I have checked the service on the target machine and it's up and running, so how can I determine the error? Is there any way to re-install terminal services and see if it just fixed?

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  • VirtualBox guest OS accessing local server on host OS.

    - by Maxim
    Hi, On my Ubuntu HOST I have my local webserver. I installed VirtualBox and Debian as a GUEST. I would like Debian guest to be able to hit my webserver running on my Ubuntu host (for example, I just type http://localhost:8080/ in the browser under Debian). How can this be done? Thanks in advance.

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  • How to get data from a borked Windows Home Server

    - by harhoo
    Yesterday we had a power surge, followed by a power outage. This left my WHS borked: powering on just gives to a flashing blue light (the led on the power supply also flashes green) - no fan or boot activity, nothing. I urgently needed some files off there in the short term (and the 500GB of photos, music, personal video etc in the long term) so I took the hard drive out and put it in my computer. The files and folders showed up, but I couldn't access them - clicking on an image gave an invalid image error in Picasa, I couldn't play MP3s etc. I changed the ownership and permissions of the files, still nothing. I booted in with a LiveCD, the same: files appear, but won't open. Is there anything else I can do? I'm now wondering if it was just the power cable that's broken, but if so, why can;t I access my files from the hard drive? If it is the power cable, and I replace that and the hard drive, will I have done any harm messing around with ownership and file permissions?

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  • Changing time or offsetting it in OpenVZ contained server

    - by Milad Naseri
    I am trying to run a VPS, a Debian box contained in an OpenVZ container. Obviously, I cannot use time --set or any such command, as the time must be set via the parent node. The owner of the parent node, however refuses to adjust the time (which is 30 minutes slower than the actual time). All the programs on my system, consequently, now recognized the false time and this throws a wrench in my syncing. Is there a way to possibly change the system time without interference from the container's administrator? Or perhaps, failing that, a way to make the programs "see" the time 30 minutes faster than what is reported by the container?

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  • Server 2012 intermittently fails to respond to pings from single host, even with firewall disabled, but responds to non-ICMP requests fine

    - by James Westbury
    This one is kind of weird. I've got the following machines involved: DC01 - 10.1.2.42, Server 2012, domain controller & DNS server, physical machine nagiosv - 10.1.2.35, CentOS 6.4, Nagios, virtual machine CB01 - 10.1.3.81, Ubuntu 12.04 LTS, couchbase server, virtual machine So, I noticed something was wrong while configuring this new Nagios VM. I started seeing DC01's state flapping. I logged into nagiosv when I saw this happening, and attempted to ping DC01, both by FQDN and its IP address. Neither worked. I tried pinging the machine from CB01, which is another VM on the same virtual switch/physical NIC as nagiosv, and that worked fine. Pings still failing from nagiosv at this time. DC01 is also an internal DNS server, so I ran dig google.com from nagiosv, and was able to run a query against DC01 just fine: ;; Query time: 1 msec ;; SERVER: 10.1.2.42#53(10.1.2.42) ;; WHEN: Fri Nov 1 07:53:51 2013 ;; MSG SIZE rcvd: 204 Pings still failing from nagiosv, though. I can ping from DC01 to nagiosv, and that works, and I can still ping from other VMs on the same physical NIC into DC01, and that works. I should mention at this point that I've disabled the firewall on DC01 for testing purposes, and it doesn't make a damned bit of difference. (Even with the firewall enabled, I have a blanket exception for ICMP from the local subnet, so it shouldn't make a difference, but I figured I should test it anyway.) I loaded up Wireshark on DC01 and pinged it from nagiosv again. What I see is a bunch of echo requests coming in and not a single reply going back out. Filtered results here, showing all ICMP traffic during a 15-second period. A few more bits of info: There are no IP conflicts on the network. MAC addresses on the incoming pings match the MAC on the VM. There are no duplicate MACs on the network, as far as I can see. I have absolutely no idea why DC01 is failing to respond, here. Any ideas?

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  • Understanding connection tracking in iptables

    - by Matt
    I'm after some clarification of the state/connection tracking in iptables. What is the difference between these rules? iptables -A FORWARD -m state --state ESTABLISHED,RELATED -j ACCEPT iptables -A FORWARD -m conntrack --ctstate ESTABLISHED,RELATED -j ACCEPT Is connection tracking turned on when a packet is first matched containing -m state --state BLA , or is connection tracking always on? Can/Should connection state be used for fast matching like below? e.g. suppose this is some sort of router/firewall (no nat). # Default DROP policy iptables -P INPUT DROP iptables -P OUTPUT DROP iptables -P FORWARD DROP # Drop invalid iptables -A FORWARD -m state --state INVALID -j DROP # Accept established,related connections iptables -A FORWARD -m state --state ESTABLISHED,RELATED -j ACCEPT # Allow ssh through, track connection iptables -A FORWARD -p tcp --syn --dport 22 -m state --state NEW -j ACCEPT

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  • MSDTC Port 135 open bi-directionally

    - by Stephen Lacy
    I have two servers, a web application server and an SQL Server database running on its own server. I have a firewall between these two servers. Do I have to open port 135 on both the SQL Server and the Web Application Server. Does the SQL Server open its own connection to the Web Application Server on port 135 or any other port? Do I have to in component services point the Web Application Server MSDTC at the SQL Database Server? If the firewall is completely open, the settings in component services set to allow remote connections, remote administration etc is there any other settings that need to be changed in order to allow remote connections to the SQL Server MSDTC?

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  • Windows Server 2008 small business server 64-Bit Vmware Server 2 IIS 7 HTTP Error 503. The service i

    - by deeztech69
    Hello, I've tried to install vmware server 2 on a small business server 2008 host and IIS 7 stopped working. Everytime I tried to access any website on the server including OWA I get HTTP Error 503. The service is unavailable. I've tried to restart the IIS services and websites with no luck. Removed vmware server and the problem persists. There are no errors in the application logs concerning IIS or anything related. I'm stumped. Does anyone have an idea what's happenning here and how to fix it?

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  • Dates not recognized as dates in pivot table pulling directly from SQL Server

    - by Michael K
    My pivot pulls from an external data source with a date column. Excel doesn't see this column as a date and the 'Format Cells' option panel doesn't change how the dates are displayed. The cell data is left-aligned, suggesting a string rather than a date. I have tried cast(myvar as date) and convert(varchar, myvar, 101) and convert(varchar, myvar, 1) in the base table, but none of these have been picked up by Excel as dates. If the column is recognized as a date, I can group by week and month. I understand that if I can't fix this, the next step is to add columns with weeks and months for each date to the table, but I'd like to give formatting the column one more shot before doing that.

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