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• Basic connectivity issues between Win 7 and XP mixed wired/wireless network. [Solved]

  - by Pulse

  Setup: Windows 7 x64 Ultimate desktop hard wired to Asus WL500gp router (WL500gpv2-1.9.2.7-d-r1445 firmware) Several Bridged VirtualBox VM's running XP, 7, ubuntu server 10.04, Mint 9 and SuSE 11.2 Win XP Pro SP3 notebook with D-Link Airplus wireless network card. No firewall or other security software currently running on either platform (at least for the duration of the test) Situation: Router is acting DHCP server Clients are receiving correct addresses and additional parameters Internet connectivity is available from all clients Windows 7 sharing is set to Network type = work (not home group) NetBT is disabled on all clients using smb over TCP What I can do: I can ping the router and internet addresses from the wireless XP notebook I can ping the Win 7 desktop and any VM from the XP wireless notebook I can ping all devices from the router All VM's and 7 can ping each other and the router as well as Internet addresses What I can't do: I cannot ping the XP wireless notebook from either the Win 7 desktop or the VM's; it always returns a destination host unreachable error. Tracert resolves the name or the XP notebook but also returns a destination host unreachable. From the above it would seem that something is blocking connectivity in a single direction (from the Win 7 box to the Win XP notebook) only but the router can ping the XP notebook. Some fresh input would be most welcome, as this is beginning to drive me batty. Thanks

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• SSH not working through Double NAT

  - by d_inevitable

  I am trying to setup port forwarding for ssh through 2 NATs The first Router translates my internet IP to my outer network (10.1.7.0). In the outer network there's a second Router that does NAT to my inner network (192.168.1.0). The target server is connected to both, the outer network and the inner network. I cannot change the port forwarding options for outer router. It is currently configured to forward the SSH and HTTP port to the router for the inner network. Internet + | v +-----------------+ +------------------+ | Outer Router | | Inner Router | |-----------------| |------------------| | | SSH HTTP | | +----+ +--------------------->| | | | | | | | | | | | | +-------+---------+ +------+---------+-+ | | | | | | | | | | | | | | +------------------+ | SSH | | | | Server | | | | | |------------------| | | | +-----------> |<-------+ | | | | |HTTP (testing) | +------------------+ | | | +------v------------------+ | | Outer Workstation | +-------------------+ | |-------------------------| | Inner Workstation| | | | |-------------------| | | | | |<----------------+ +-------------------------+ | | +-------------------+ When connecting from a outer workstation to the address of the inner router, then both SSH and HTTP work fine. When connecting from the internet to my public ip with HTTP, the connection works fine as well. However SSH just times out. Most likely because the reply is not routed back properly. I suspect its either because of the SSH itself, or because the server is connected to both, the inner and outer network. Any ideas how I could resolve this issue? The routes on the server are currently: ip route show default via 10.1.7.254 dev eth0 metric 100 10.1.7.0/24 dev eth0 proto kernel scope link src 10.1.7.1 192.168.1.0/24 dev eth1 proto kernel scope link src 192.168.1.2 Do I have to change this? If so how?

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• Windows 7. Permission to search but not for any user to browse

  - by acidzombie24

  I recently changed permissions on my external usb drive so users by default dont have read permission. Now i realize i cannot search through the drive. after setting 'everyone' permission to read i could again. How do i set it so everyone does not have read permission except for my username (i hate clicking yes to admin prompt everytime i move a file) and allow the system to search the drive when users are allowed to access those files?

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• Uploads fail with shorewall enabled

  - by JamesArmes

  I have an Ubuntu 8.04 server with shorewall 4.0.6 installed. When I try to upload files using FTP, SCP, or cURL the file upload stalls almost immediatly and eventually times out. If I turn off shorewall then the uploads work fine. I don't have any rules that specifically allow FTP and I'm not too concerned with it, but I do need to be able to upload via 22 (SCP) and 80 & 443 (cURL). This is what my rules look like: COMMENT Allow Server to respond to any web (80) and SSL (443) requests ACCEPT net $FW tcp 80 ACCEPT $FW net tcp 80 ACCEPT net $FW tcp 443 ACCEPT $FW net tcp 443 COMMENT Allow Server to respond to SNMPD (161) requests ACCEPT net $FW udp 161 COMMENT Allow Server to respond to MySQL (3306) requests (for MySQL Graphing) ACCEPT net $FW tcp 3306 COMMENT Allow Server to respond to any SSH connection attempts, and to SSH out. SSH/ACCEPT net $FW SSH/ACCEPT $FW net COMMENT Allow Server to make DNS Requests out. DNS/ACCEPT $FW net COMMENT Default "close" anything else. Ping/REJECT net $FW ACCEPT $FW net icmp #LAST LINE -- ADD YOUR ENTRIES BEFORE THIS ONE -- DO NOT REMOVE I expected the top four ACCEPT lines to allow inbound and outbound traffic over 80 and 443 and I expected the two SSH/ACCEPT lines to allow inbound and outbound trffic over 22, including SCP. Any help is greatly appreciated. /etc/shorewall/policy contains the following (all lines above are commented out): # # Allow all connection requests from teh firewall to the internet # $FW net ACCEPT # # Policies for traffic originating from the Internet zone (net) # Drop (ignore) all connection requests from the Internet to the firewall # net all DROP info # THE FOLLOWING POLICY MUST BE LAST # Reject all other connection requests all all REJECT info #LAST LINE -- ADD YOUR ENTRIES ABOVE THIS LINE -- DO NOT REMOVE

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• How to disable check of free disk space before copying files?

  - by tputkonen

  I really hate the feature in Windows 7, that it verifies before copying any files whether the files fit to the destination drive. I have a pretty old MP3 player and I want to just select n songs and drag & drop them to the player, and copy as many files of the selection as possible. Windows 7 refuses to copy any of the files if all of them don't fit to the destination drive. How can I disable this annoying behaviour?

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• HTTPS Proxy which answers CONNECT with own certificate

  - by user1109542

  I'm configuring a DMZ which has the following Scheme: Internet - Server A - Security Appliance - Server B - Intranet In this DMZ I need a Proxy server for http(s) connections from the Intranet to Internet. The Problem is, that all Traffic should be scanned by the Security Appliance. For this I have to terminate the SSL Connection at Server B, proxy it as plain http to Server A through the Security Appliance and then further as https into the Internet. An encryption is then persistent between the Client and Server B and the Target Server and Server A. The communication between Server A and Server B is unencrypted. I know about the security risks and that the client will see some warning about the unknown CA of Server B's certificate. As Software I want to use Apache Web Servers on Server A and Server B. As first step I tried to configure Server B that it serves as endpoint for the SSL Encryption. So it has to establish the encryption with the client (answering HTTP CONNECT). Listen 8443 <VirtualHost *:8443> ProxyRequests On ProxyPreserveHost On AllowCONNECT 443 # SSL ErrorLog logs/ssl_error_log TransferLog logs/ssl_access_log LogLevel debug SSLProxyEngine on SSLProxyMachineCertificateFile /etc/pki/tls/certs/localhost_private_public.crt <Proxy *> Order deny,allow Deny from all Allow from 192.168.0.0/22 </Proxy> </VirtualHost> With this Proxy only the CONNECT request is passed through and an encrypted Connection between the client and the target is established. Unfortunately there is no possibility to configure mod_proxy_connect to decrypt the SSL connection. Is there any possibility to accomplish that kind of proxying with Apache?

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• Is it possible to command a common router without using the web interface?

  - by MDeSchaepmeester

  Some background The internet arrangement in my student home is really weird. There is one ethernet outlet and several wifi hotspots. Either way requires a login through a web site to get internet access. This is annoying as each device needs to login seperately and with a PS3 for example, it is impossible to get connected at all since the web login procedure doesn't work. Therefore I have installed a D-Link DIR-635 router which is connected to the ethernet outlet. It has DHCP enabled so it uses NAT, but whatever it is connected to also uses NAT and I've read this should not work. A fellow student tried it with an Apple Airport but that keeps giving errors related to NAT after NAT. Anyway my setup does work so bonus points if you can clarify this. I need to login to the web site I mentioned earlier with any device, after which all devices in my LAN have connectivity. This is great. Except... In short From time to time, I lose internet connectivity and my D-Link DIR-635 router needs to do a DHCP renew. I can do this via the web interface but my life would be easier if I could just run a cmd file which tells my router to do this without all the hassle. This would setup a connection to my router and execute the proper command. I have tried googling but couldn't find much helpful stuff.

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• Router as primary DNS server, Server as alternate? (or vice versa)

  - by Jakobud

  We have a very small business network, with a typical cable modem hooked into a DD-WRT router. We also run a basic CentOS server that does a variety of things, including acting as the primary DNS server for the office. The reason we need an internal DNS server is because we do a lot of internal web development and use the DNS server to add/remove various local network URLs for internal website testing (like www.testsite.com.local). It's very important for us to be able to add/remove URL aliases easily to the DNS. The problem with this setup is that if we ever need to restart the CentOS server or take it offline for upgrades or whatever, then internet access for all computers on the network is lost. That's because each computer relies on that DNS server to access the Internet I guess? The router is online all the time and very very rarely has to be restarted. It would be nice if we could setup my router to be the primary DNS server but still be running DNS on my server. So we could still add my local testing website URLs to the DNS server in CentOS, but be able to also take down the CentOS server without loosing Internet access on the network. How would this be setup? Would I simply need to add both router + server IP addresses to each computer's IP settings? Is the router primary DNS and server secondary DNS server? Or vice versa? Or can one of the two serve as a fallback for the other? What (if anything) needs to be configured on both the router and server in order for them to recognize that the other DNS server exists on the network? Does anyone have any newb-friendly resources for setting up something like this?

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• Route outbound connections from local network through VPN

  - by Sharkos

  I have a server A running OpenVPN, an OpenVPN client B (a rooted Android phone as it happens) and a third party C (a laptop, tablet etc.) tethered to B. B can use the VPN to access the internet via A; C can use the tethered connection WITHOUT the VPN to access the internet via B. However, with the VPN on B active, I cannot load information from the internet on C. A appears to log similar traffic inbound and outbound when B or C attempt to load a webpage, say, but the VPN on device B reports no inbound traffic when the connection originated from C. Where should I look for packets being dropped, and what ip rules should I use to make sure they are passed back through the VPN and into the local network B <- C? (I'll obviously post whatever further information is needed.) Further info Without VPN: root@android:/ # ip route default via [B's External Gateway] dev rmnet0 [B's External Subnet] dev rmnet0 proto kernel scope link src [B's External IP] [B's External Gateway] dev rmnet0 scope link 192.168.43.0/24 dev wlan0 proto kernel scope link src 192.168.43.1 With VPN: root@android:/ # ip route 0.0.0.0/1 dev tun0 scope link default via [B's External Gateway] dev rmnet0 [B's External Subnet] dev rmnet0 proto kernel scope link src [B's External IP] [B's External Gateway] dev rmnet0 scope link [External address of A] dev tun0 scope link 128.0.0.0/1 dev tun0 scope link 172.16.0.0/24 dev tun0 scope link 172.16.0.8/30 dev tun0 proto kernel scope link src 172.16.0.10 192.168.43.0/24 dev wlan0 proto kernel scope link src 192.168.43.1 192.168.168.0/24 dev tun0 scope link

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• Is there a way to prevent a message from accidentally being sent?

  - by dan

  I am terrified of accidentally sending a reply before I'm finished editing it. Usually what I do is either: copy the email into word, edit in word, then hit reply-to-all in outlook, paste in my text, and send. hit reply-to-all, delete the recipient names, edit, add the recipient names, and send. Is there a way to 'lock' the email so I can't send it while I'm making edits in Outlook? I hate having to switch between programs just so I can edit.

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• Powerpoint paste option from other applications

  - by huggie

  In MS Word, there is an option to choose the pasting behavior between the same application and different applications. It's under the Office button-word options-advanced. However I don't see the same option for Powerpoint. Is there one available? I hate it when they don't make it consistent between apps.

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• Use Windows 7 default icons with Notepad++

  - by CFP

  I do like Notepad++, but I hate its icon. I'm very happy with Windows 7 icons for txt/ini/... files, and would like to keep them. How can I associate Notepad++ with all supported filetypes without changing icons? With Notepad2, the problem did not occur.

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• How much audio latency is noticeable by human brain?

  - by Borek

  I am choosing a wireless headset for my PC (I hate cables) and am looking at Sennheiser RS 170 / 180. They supposedly sound great, however, there is a 25ms audio latency. I've heard that this is OK when watching TV or listening musing but is bad for games. The question is - has there been any research / hard data that would show how much of a delay is noticeable by human brain? 25ms doesn't sound like a lot but I may be wrong.

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• Need solution for Network/Servers.

  - by rehanplus

  Dear All, Please help me. I just joined a new Hospital and want some help managing my network. There are some requirements: Current Network: There is a D.S.L connection and that is terminated on a LINUX proxy and then connected to D-Link layer 2 switches and then providing internet to more then 200 PC's (Would be increasing to 1500 in couple of months). D-Link switches are not configured yet. Also there is one Database server Report server and an application server. In near Future Application should be accessed by local users as well as remote users from internet via our web server. We do have a sharing server and all these servers databases and PC's are on single sub net. Required Network: All i do want is to secure my network from outside access and just allowing specific users via web application and they will be submitting there record for patient card and appointment facility by means of application and entering there record (on our database) but not violating our network resources. Secondly in house users also need to access the same application and also internet but they must have some unique identity and rights (i.e. Finance lab dept. peoples do have limited access to that application). Notes: Should i create V LAN or break sub nets. Having a firewall will solve my issues? is a router needed on these type of scenario's. Currently all the access are restricted from Linux Proxy. Thanks.

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• Wireless connection silently dies randomly

  - by Force Flow

  I have two WAP4410N wireless access points powered using Power-Over-Ethernet. They are both connected to the same LAN and broadcasting the same SSID with a WPA2 password. One is using channel 1, while the other is using channel 11. There is coverage overlap where the signal from both access points hover around -75db to -85db while standing in the same physical location. DHCP is disabled, and is being provided by another network device. Every day or so, devices can connect and authenticate to the access points, but are not granted an IP address (and subsequently are unable access to the LAN or Internet). For devices that had already retrieved an IP address prior to the issue exhibiting itself, the devices simply stop communicating with LAN and Internet. However, I can still access each access point's web admin interface from the LAN. If I reboot both devices, the problem vanishes and devices are once again able to get an IP address and connect to the LAN and Internet. Are these symptoms of signal interference between the two WAPs or is this a completely different issue?

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• what's the safest OS?

  - by Bob

  I have pretty important stuff on my PC (using Windows). All the programming files, passwords etc. And now I thought: Is that even safe to store all this information on a hard drive? What if some virus (or a pseudo-antivirus gets it) M.b. it is better to buy Mac for this purpose? I kinda don't like Linux, cause I hate making million small decisions manually (what drivers to install etc) Will like to hear some opinions.

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• How to configure Remote desktop on window server 2008 R2?

  - by Abdullah BaMusa

  I’m trying to connect over internet to my home workstation which has Windows Server 2008 R2 (Web Edition) installed from my PC at work (Windows 7 installed on it) via Remote Desktop. I configure the workstation to accept remote desktop and I can connect to it from my laptop if I’m within same Home LAN but I can’t establish the connection from my PC at work . My question is: Is possible to connect to my workstation over internet using remote desktop? Is there any step by step resource the setup this feature?

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• FREED(id): message release sent to freed object error solution ?

  - by Meko

  Hi.In my Iphone app I am getting: objc[597]: FREED(id): message release sent to freed object=0x3b81780 error.What should cause this error?IS it about memory allocation? I have UITable and model view that include some text field.It takes username from model view and search this in internet and gets some images from internet.It takes data but when model view disappears app exits.and gives that error.When model views close it runs my method and gets value.But it exits from app.

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• Good Tutorial To Learn C++ Development For Game Boy

  - by Nathan Campos

  I'm learning C++ with this book of Deitel: C++ How to Program, 5/e and some tutorials and resources of the internet, but i want to learn how i can develop Nintendo GameBoy Advance games using C++, but only in resources over the internet, because i don't want to spent money now with a thing that i only want to try.

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• Locating JNLP file contents

  - by pgebhard

  When running a JNLP file, the application is downloaded from the Internet. Where does it store these downloaded files? I'm trying to figure out how to copy the application to a computer without Internet access. FYI, I'm working with Java 1.6 (C:\Program Files\Java\jdk1.6.0_17).

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• Types of PNG image in iPhone app

  - by user297491

  I have an iPhone app that picks images from my internet server. It picks images with png extension but only PNG-24 is workings. The problem is that PNG-24 need some disk space and internet bandwith in iphone. I tried using PNG-8 but the iphone does not recognize it. Someone knows if I have a way to use PNG-8 into my app? Thanks!

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• Is XML a good logic to load data??

  - by Mat

  Hi stack, i'm working on an app that loads some data from xml file from internet. Is this a good way to develop iPhone apps??...I think xml is more light than SQlite database... Basically my logic is: 1 - Parsing Xml file from internet to retrive the data 2 - Load data on device Security?..other stuff??.. Thanks Mat

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• iPhone reachability checking

  - by Sneakyness

  I've found several examples of code to do what I want (check for reachability), but none of it seems to be exact enough to be of use to me. I can't figure out why this doesn't want to play nice. I have the reachability.h/m in my project, I'm doing #import <SystemConfiguration/SystemConfiguration.h> And I have the framework added. I also have: #import "Reachability.h" at the top of the .m in which I'm trying to use the reachability. Reachability* reachability = [Reachability sharedReachability]; [reachability setHostName:@"http://www.google.com"]; // set your host name here NetworkStatus remoteHostStatus = [reachability remoteHostStatus]; if(remoteHostStatus == NotReachable) {NSLog(@"no");} else if (remoteHostStatus == ReachableViaWiFiNetwork) {NSLog(@"wifi"); } else if (remoteHostStatus == ReachableViaCarrierDataNetwork) {NSLog(@"cell"); } This is giving me all sorts of problems. What am I doing wrong? I'm an alright coder, I just have a hard time when it comes time to figure out what needs to be put where to enable what I want to do, regardless if I want to know what I want to do or not. (So frustrating) Update: This is what's going on. This is in my viewcontroller, which I have the #import <SystemConfiguration/SystemConfiguration.h> and #import "Reachability.h" set up with. This is my least favorite part of programming by far. FWIW, we never ended up implementing this in our code. The two features that required internet access (entering the sweepstakes, and buying the dvd), were not main features. Nothing else required internet access. Instead of adding more code, we just set the background of both internet views to a notice telling the users they must be connected to the internet to use this feature. It was in theme with the rest of the application's interface, and was done well/tastefully. They said nothing about it during the approval process, however we did get a personal phone call to verify that we were giving away items that actually pertained to the movie. According to their usually vague agreement, you aren't allowed to have sweepstakes otherwise. I would also think this adheres more strictly to their "only use things if you absolutely need them" ideaology as well. Here's the iTunes link to the application, EvoScanner.

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• Twisted: why is it that passing a deferred callback to a deferred thread makes the thread blocking a

  - by surtyaarthoughts

  I unsuccessfully tried using txredis (the non blocking twisted api for redis) for a persisting message queue I'm trying to set up with a scrapy project I am working on. I found that although the client was not blocking, it became much slower than it could have been because what should have been one event in the reactor loop was split up into thousands of steps. So instead, I tried making use of redis-py (the regular blocking twisted api) and wrapping the call in a deferred thread. It works great, however I want to perform an inner deferred when I make a call to redis as I would like to set up connection pooling in attempts to speed things up further. Below is my interpretation of some sample code taken from the twisted docs for a deferred thread to illustrate my use case: #!/usr/bin/env python from twisted.internet import reactor,threads from twisted.internet.task import LoopingCall import time def main_loop(): print 'doing stuff in main loop.. do not block me!' def aBlockingRedisCall(): print 'doing lookup... this may take a while' time.sleep(10) return 'results from redis' def result(res): print res def main(): lc = LoopingCall(main_loop) lc.start(2) d = threads.deferToThread(aBlockingRedisCall) d.addCallback(result) reactor.run() if __name__=='__main__': main() And here is my alteration for connection pooling that makes the code in the deferred thread blocking : #!/usr/bin/env python from twisted.internet import reactor,defer from twisted.internet.task import LoopingCall import time def main_loop(): print 'doing stuff in main loop.. do not block me!' def aBlockingRedisCall(x): if x<5: #all connections are busy, try later print '%s is less than 5, get a redis client later' % x x+=1 d = defer.Deferred() d.addCallback(aBlockingRedisCall) reactor.callLater(1.0,d.callback,x) return d else: print 'got a redis client; doing lookup.. this may take a while' time.sleep(10) # this is now blocking.. any ideas? d = defer.Deferred() d.addCallback(gotFinalResult) d.callback(x) return d def gotFinalResult(x): return 'final result is %s' % x def result(res): print res def aBlockingMethod(): print 'going to sleep...' time.sleep(10) print 'woke up' def main(): lc = LoopingCall(main_loop) lc.start(2) d = defer.Deferred() d.addCallback(aBlockingRedisCall) d.addCallback(result) reactor.callInThread(d.callback, 1) reactor.run() if __name__=='__main__': main() So my question is, does anyone know why my alteration causes the deferred thread to be blocking and/or can anyone suggest a better solution?

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• Data Synchronization between Enterprise DataStore and External WebSite DataStore

  - by Yoann. B

  Hi, I've an enterprise database store used by some rich applications and a website with it own database store. Enterprise application work with local data and some of these data (like orders,prices ...) have to be "synchronized" to the web site datastore. On the other side, internet customers are able to edit their profile which have to be "synchronized" to the enterprise datastore too. Basically i need this architecture : WebSite = WebSite Database <= || Internet || <= Enterprise Database <= Rich Applications

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