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• Slow internet using Arch Linux

  - by GZaidman

  after a week or so of using Arch Linux I cant access the internet - it takes around 5 mins to load google (most of the other websites just give me a timeout), pacman's downloading speed range between 5-2Kbs, and pinging google takes around 9Kms. I'm connected using wireless network (wifi card is Intel Ultimate 6300 and router is Edimax 6524n). Every other Windows machine that's connected to the network (and even the T410 running Windows) is fine, so the problem lies in Linux. So far, i checked the resolv.conf file (my router ip address is listed), and the hosts file (pretty much default), and I disabled the ipv6 module. None of that helped. PS: i'm using NetworkManager (but the problem still occurs when connecting using wicd) running on Gnome3. Thanks in advance for any help you can provide! EDIT: something really strange happens whenever I ping google: i get an unknown host 'google.com', but the bit rate from the card jumps at the exact second I ping google (so far, the bit rate jumped to 54Mb/s from 1Mb/s over the course of 4 pings).

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• Detecting man-in-the-middle attacks?

  - by Ilari Kajaste

  There seem to be many possible ways to create man-in-the-middle attacks on public access points, by stealing the access point's local IP address with ARP spoofing. The possible attacks range from forging password request fields, to changing HTTPS connections to HTTP, and even the recently discovered possibilit of injecting malicious headers in the beginning of secure TLS connections. However, it seems to be claimed that these attacks are not very common. It would be interesting to see for myself. What ways are there to detect if such an attack is being attempted by someone on the network? I guess getting served a plain HTTP login page would be an obvious clue, and of course you could run Wireshark and keep reading all the interesting ARP traffic... But an automated solution would be a tiny bit more handy. Something that analyzes stuff on the background and alerts if an attack is detected on the network. It would be interesting to see for myself if these attack are actually going on somewhere.

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• CNTLM issue with intranet (maybe DNS)

  - by htorque

  On my Linux box I need to use an ISA proxy that requires authentication to reach the internet. I therefore installed CNTLM and configured it to point to the proxy address and listen on port 4321. I then configured my GNOME distribution to use localhost:4321 as global proxy for HTTP and HTTPS. The result: I can connect to the internet. I can ping intranet IPs, I do receive name resolution for intranet sites, yet I cannot ping them or open any intranet site in a browser (configured to use the distributions proxy) unless I use the site's IP address. I tried blocking the intranet IP range in the CNTLM config file without luck.

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• VPN to Buffalo WHR-HP-G300N produces a Connection Error 807

  - by Darius

  My friend has modem/router from Clear and I have sent him Buffalo router to put it between his Clear device and the Network. I walked him thru establishing VPN in DD-WRT but when I try to VPN I get a VPN Connection Error 807. I am out of ideas how to solve this. Any suggestion? Clear Modem WAN: xx.xx.xx.xx Clearn Modem NAT's to: 192.168.15.XXX Clear Modem DHCP: 192.168.15.2 - 192.168.15.2 (range is limited to that of ONE ip address) Clear Modem DMZ: 192.168.15.2 the LAN of the clear modem is 192.168.15.XXX The DD-WRT IP: 192.168.4.1 Port FWD: 1723 to 192.168.4.1 PPTP server listens on 192.168.4.1 Where is the problem with this setup?

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• why would you create two different subnets on the same physical network?

  - by xirtyllo

  I'm working at a messy location, one of the strange (for me) things is that on the same physical network there are two different subnets. Specifically some computers will have 10.0.0.0/24 and some others will have 172.16.0.0/24. There is only one DHCP server, which gives IPs on the 10.0.0.0/24 range, and there are two internet gateways, one with IP 172.16.0.1 and one with IP 10.0.0.1 . To give an example, I can easily swap one PC from one subnet to the other just by changing its IP and gateway settings. I am trying to imagine why they created the network this way, and which may be the possible advantages and/or drawbacks of having two different subnets on the same physical network. Any thoughts?

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• Which is better for running Ubuntu and other Linux OSes, Chromebook or Windows, why? [on hold]

  - by Serge

  I'm learning programming and I would like to switch to a Linux OS, perhaps Ubuntu, to continue this, but the current machine is generally getting pretty old and slow and Windows is the least favorite option for production, and I can manage getting something new right around the price range of the nicest Chromebook on the market right now. However, I have compared specs of HP Chromebook 14 with those of regular PC laptops that roughly cost the same, and the latter consistently have approximately the same and sometimes higher (like the processor speed) specs. Yet usage of Chromebooks for this purpose is pretty widespread nowadays. Is this because they were initially built for a Linux OS - and is it really THAT crucial - or are there other major factors at play here?

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• Postgres error messages in Apache error log

  - by Warren Pena

  I'm running Apache 2.2, PHP 5.2, and Postgres 8.2 on Windows, and I'm seeing something funky in Apache's error.log file. Occasionally, I'll see the message "row number -1 is out of range 0..-1" pop up over and over. Unlike all the other lines in that log file, there's no timestamp or log level. Just that exact string. Googling around, it appears that message is, character for character, a common Postgres error message, but is not an Apache error. I've seen it happen multiple times, and on several different servers. I can't seem to reproduce it, though. I've tried throwing all sorts of error ridden database queries and result set inquiries at Postgres via PHP, and none of them seem to trigger that line being written to the log file. Is it possible for Postgres errors to be ending up in my Apache log file, and if so, how? What would trigger an error message like that? Thanks!

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• CPU Cooling with Heatsinks

  - by Jason Tzen

  I've constructed a server that uses 2 Xeon E5-2620 CPUs and per Intel's recommendation I'm in the process of ordering heatsinks for each and I'm slightly concerned about thermal management. The case I'm using is well ventilated (the Coolermaster Cosmos II) but I have a few concerns regarding the adequacy of the heatsinks recommended by the MB manufacturer (Supermicro CPU HeatSink SNK-P0048PS). As you can see these heatsinks come without a fan and I'm wondering if they can keep the Xeons within their normal temperature range... Due to the low volume of literature on the topic I wasn't able to find anything conclusive.

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• Server Fault Wiki: How does Subnetting Work?

  - by Kyle Brandt

  How does Subnetting Work, and How do you do it by hand or in your head? Can someone explain both conceptually and with several examples? Server Fault gets lots of subnetting homework questions, so we could use an answer to point them to on Server Fault itself. If I have a network, how do I figure out how to split it up? If I am given a netmask, how do I know what the network Range is for it? Sometimes there is a slash followed by a number, what is that number? Sometimes there is a subnet mask, but also a wildcard mask, they seem like the same thing but they are different? Someone mentioned something about knowing binary for this? Not looking for links to other sites (unless maybe you have one post with a bunch of good ones). I already know how to subnet, I just thought it would be nice if Server Fault had a generic subnetting answer.

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• extending django usermodel

  - by imran-glt

  Hi i am trying to create a signup form for my django app. for this i have extended the user model. This is my Forms.py from contact.models import register from django import forms from django.contrib import auth class registerForm(forms.ModelForm): class Meta: model=register fields = ('latitude', 'longitude', 'status') class Meta: model = auth.models.User # this gives me the User fields fields = ('username', 'first_name', 'last_name', 'email') and this is my model.py from django.db import models from django.contrib.auth.models import User STATUS_CHOICES = ( ('Online', 'Online.'), ('Busy', 'Busy.'), ('AppearOffline', 'AppearOffline.'),) class register(models.Model): user = models.ForeignKey('auth.User', unique = True) latitude = models.DecimalField(max_digits=8, decimal_places=6) longitude = models.DecimalField(max_digits=8, decimal_places=6) status = models.CharField(max_length=8,choices=STATUS_CHOICES, blank= True, null=True) i dont know where i am making a mistake. the users passwords are not accepted at the login and the latitude and logitude are not saved against the created user user. i am fiarly new to django and dont know what to do any body have any solution .?

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• On a router, how do I block wan access for a particular machine without blocking its access to the local network?

  - by HappyEngineer

  On my tp-link TL-WR1043ND router I want to prevent a particular machine from having access to the WAN while still allowing that machine to access other machines on the LAN. My assumption is that I need to do something in the "Access Control" section, however the problem is that it wants an ip range or domain name for the target of the rule. The router uses DHCP to get an address from the WAN, so I don't have any guarantee what the ip address of the wan will be. If the answer is that it's not possible with this router, could someone describe how to do it using OpenWRT instead?

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• JSF command button attribute is transferred incorrectly

  - by Oleg Rybak

  I have following code in jsf page, backed by jsf managed bean <h:dataTable value="#{poolBean.pools}" var="item"> <h:column> <f:facet name="header"> <h:outputLabel value="Id"/> </f:facet> <h:outputText value="#{item.id}"/> </h:column> <h:column> <f:facet name="header"> <h:outputLabel value="Start Range"/> </f:facet> <h:inputText value="#{item.startRange}" required="true"/> </h:column> <h:column> <f:facet name="header"> <h:outputText value="End Range"/> </f:facet> <h:inputText value="#{item.endRange}" required="true"/> </h:column> <h:column> <f:facet name="header"> <h:outputText value="Pool type"/> </f:facet> <h:selectOneMenu value="#{item.poolType}" required="true"> <f:selectItems value="#{poolBean.poolTypesMenu}"/> </h:selectOneMenu> </h:column> <h:column> <f:facet name="header"/> <h:commandButton id="ModifyPool" actionListener="#{poolBean.updatePool}" image="img/update.gif" title="Modify Pool"> <f:attribute name="pool" value="#{item}"/> </h:commandButton> </h:column> </h:dataTable> This code fragment is dedicated to editing come collection of items. Each row of the table contains "edit" button that submits changed values of the row to the server. It has the item itself as an attribute. Submit is performed by calling actionListener method in the backing managed bean. This code runs correctly on Glassfish v 2.1 But when the server was updated to Glassfish v 2.1.1, the attribute stopped to be passed correctly. Instead of passing edited item (when we change the values in table row, we are actually changing the underlying object fields), the source item is submitted to server, i.e. the item that was previously given to the page. All the changes that were made on the page are discarded. I tried to update jsf version from 1.2_02 to 1.2_14 (we are using jsf RI), but it had no effect. Perhaps anyone came across the same problem? Any help and suggestions will be appreciated.

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• saving the videos and photos in iPhone Simultor 4.0

  - by Mohammed Sadiq

  Hi All, From 4.0 apple has extended their api support to access the videos and photos from the phone. I am using only iPhone 4.0 simulator to test my application. When I try to save the video as apple has mentioned in their api docs, its giving the error something like "Error Saving the Asset". The way I try to store the video is as follows : ALAssetsLibraryWriteVideoCompletionBlock _videoCompblock = ^(NSURL *assetURL, NSError *error){ if(assetURL) { NSLog(@"Video AssetUrl : %@", [assetURL absoluteString]); } else if(error) { NSLog(@"The Error occured : %@", [error localizedDescription]); } }; BOOL isSupported = [library deoAtPathIsCompatibleWithSavedPhotosAlbum:videoFileUrl]; if(isSupported) { [library writeVideoAtPathToSavedPhotosAlbum:videoFileUrl completionBlock:_videoCompblock]; } The above methods should print the url of the video on successful saving of the video file. But its printing the error message as "ERROR SAVING THE ASSET". Any idea or help on this topic will be greatly appreciated. Best Regards, Mohammed Sadiq.

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• Reduce the I/O priority of Windows Backup (Windows Server 2008 R2)

  - by HelloSam

  I have a PostgreSQL running on Windows Server 2008 R2 x64 box. And I have scheduled a backup everyday from the RAID 1 DB disk to a dedicated standalone disk. They are SAS 15k on Dell PERC 6i. I am using the built-in Windows Server Backup for purpose. The problem is, whenever the backup process is kicked in, the database performance is hogged. I would say almost a 10x of performance reduction. From the resource monitor, the disk queue is in the double digit range when backing up, and less than 1 during the day. The disk activity is like ~30-50MB/s during backup, so I guess the hardware is acting normally, though wbengine.exe takes up most of the portions. I think reduce the IO priority of the backup process would be an answer, but I couldn't find a way to. Tuning process CPU priority does not seems to help.

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• UPS recommendations for three grey boxes?

  - by Margaret

  Hey all We have a series of grey-box style computers acting as servers at my workplace (rather than rack-mount). We were looking to get Uninterruptible Power Supplies for them. However, I'm not sure how many at what capacity are required. I'd assume it would be a good idea to hook the peripherals in as well - there's a 18.5" LCD monitor with a KVM, along with a couple of USB hard drives that require power. I currently have the most vital machine hooked up to a cheap (temporary) UPS, but it's probably close to worse than nothing. I'm looking for reasonable value for money, though I can probably negotiate with my boss on price range. I recognise that I may well need to buy two (or even three) UPSs to support the three machines. Any recommendations?

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• URLCallback with JAAS on WAS?

  - by Dean J

  I extended the JAAS javax.security.auth.spi.LoginModule, and installed it into a WAS server. It works; all logins go through the code in this new class, and if it says to not let them login, they're prevented from logging in. The root problem: I don't want it to filter logins for the admin console (/ibm/console), but I do want it to filter logins for other things on the server. I think that with the available setup, the login module applies to everything installed on the server, including the administration screens. I'd like to solve that by getting the URL of the page that triggered the call to the LoginModule. If I were using WebLogic, I'd use a URLCallback to get the URL. Does anyone know if Websphere Application Server has any parallel functionality to that, or if there's another workaround?

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• In Android (on JB), how can I add an action to a custom rich notification?

  - by user496854

  I've been playing with the new rich notificaitons in Jelly Bean, and everything works as expected when I set up a new notificaiton using the templates Notification.BigPictureStyle, Notification.BigTextStyle, or Notification.InboxStyle. I can use the Notification.Builder.addAction() method, and the action buttons show up at the bottom of the extended notification. But when I try to create a cutsom notification using Notification.bigContentView, the action buttons never show up. Just to clarify, if I never set bigContentView, the buttons do show up. But as soon as that field is set to a custom RemoteViews object, the buttons are gone. Does anyone have any ideas on why this is happening?

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• Postgres error messages in Apache error log

  - by Warren Pena

  I'm running Apache 2.2, PHP 5.2, and Postgres 8.2 on Windows, and I'm seeing something funky in Apache's error.log file. Occasionally, I'll see the message "row number -1 is out of range 0..-1" pop up over and over. Unlike all the other lines in that log file, there's no timestamp or log level. Just that exact string. Googling around, it appears that message is, character for character, a common Postgres error message, but is not an Apache error. I've seen it happen multiple times, and on several different servers. I can't seem to reproduce it, though. I've tried throwing all sorts of error ridden database queries and result set inquiries at Postgres via PHP, and none of them seem to trigger that line being written to the log file. Is it possible for Postgres errors to be ending up in my Apache log file, and if so, how? What would trigger an error message like that? Thanks!

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• Microsoft ACE OLEDB provider throws could not find installable ISAM exception

  - by Michael Stoll

  I'm trying to read Excel spreadsheets with a 64bit Process. Therefore I use the 64 bit Version of Micorosft Access Database Engine 2010. The following code var cs = @"Provider=Microsoft.ACE.OLEDB.12.0;" + @"Data Source=C:\test.xls;" + @"Extended Properties=""Excel 14.0;"""); con = new OleDbConnection(cs); con.Open(); throw an Exception: Could not find installable ISAM Using google I found a lot of questions about this exception. But they refer to JET and seem not apply to my problem. Any recommendations?

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• How small is too small (of laptop for a programmer)

  - by defn

  Im thinking of replacing my HP Pavilion dv5-1004nr with Acer Aspire AS5738-6444, I'm a CS student... so im torn between screen size (liking the 15in and decent gpu.. but it weight nearly 8 pounds and battery can barely last 2 hours in power saver mode) and wanting something portable to carry to classes/take notes ect (3 pounds and up to 8 hour battery life of the acer) what would you guys suggest? acer any good? i love my hp keyboard.. (or have links to other good laptops, im aiming for 600$ range?)

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• Net Screen manager setup

  - by Codezy

  I'm having an issue with our NSMExpress box. I'm trying to manage all our devices, range from ns5gt to ssg320m, and some of those devices have addresses assigned by dhcp from the ISP (like pppoe or dsl). The addresses are actually static but we have the register the MAC address in order to get this address. I can actually add the device in NSM except the IP that's on the untrust side isn't imported in as it's dynamic. Because of this I cannot change many options that pertian to the untrust interface as there is no IP. I've talked to JTAC on this and they didn't know if there was a way to do this or not but then they stated that Tim Hortons does this so I'm confused on how to get this working. Maybe i'm just missing something as I imagine that other people must be doing this as well. Any assistance is appreciated! Furthermore when I import a device this is the message I get: Warnings: Interface ethernet0/0 is a pppoe/dhcp/pppoa client and its ip is NOT IMPORTED because it may be dynamic.

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• In what areas might the use of F# be more appropriate than C#?

  - by Peter McGrattan

  Over the last few years F# has evolved into one of Microsoft's fully supported languages employing many ideas incubated in OCaml, ML and Haskell. Over the last several years C# has extended it's general purpose features by introducing more and more functional language features: LINQ (list comprehension), Lamdas, Closures, Anonymous Delegates and more... Given C#'s adoption of these functional features and F#'s taxonomy as an impure functional language (it allows YOU to access framework libraries or change shared state when a function is called if you want to) there is a strong similarity between the two languages although each has it's own polar opposite primary emphasis. I'm interested in any successful models employing these two languages in your production polyglot programs and also the areas within production software (web apps, client apps, server apps) you have written in F# in the past year or so that you would previously have written in C#. EDIT: Edited based on feedback from close votes with the intent of reducing perceived ambiguity.

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• Can't use FAXCOMEXLib in VS 2010 anymore?

  - by Sam

  I'm just in the process of moving from Visual Studio 2008 to Visual Studio 2010. One of my projects use the Microsoft Fax Service Extended COM Type Library. After converting the project to VS 2010 I get the following compiler error: C:\Windows\Microsoft.NET\Framework\v4.0.30319\Microsoft.Common.Targets(1558,9): error MSB3648: The Keycontainer-path "VS_KEY_812A0248FF872DEC" ist invalid. KeyContainer must point to an existing file. C:\Windows\Microsoft.NET\Framework\v4.0.30319\Microsoft.Common.Targets(1558,9): warning MSB3283: Wrapperassembly for type library "FAXCOMEXLib" not found. I tried to remove FAXCOMEXLib from the project and adding it again, but it did not help. I got a similar problem with other COM references. How do I resolve this?

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• dhcpd won't let go of old leases

  - by Jakobud

  We have DHCP setup to hand out leases in the following range: 192.168.10.190 - 192.168.10.254 (roughly 65 leases) Our small business network only has about 30 computers that use DHCP. We noticed that dhcpd stopped handing out new dynamic leases to the computers, even though there are definitely not 65 computers on the network. Why has it stopped handing out leases? Is it not releasing old un-used leases? How do we tell dhcpd to let go of old leases and start handing out fresh ones again?

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• When is assembler faster than C?

  - by Adam Bellaire

  One of the stated reasons for knowing assembler is that, on occasion, it can be employed to write code that will be more performant than writing that code in a higher-level language, C in particular. However, I've also heard it stated many times that although that's not entirely false, the cases where assembler can actually be used to generate more performant code are both extremely rare and require expert knowledge of and experience with assembler. This question doesn't even get into the fact that assembler instructions will be machine-specific and non-portable, or any of the other aspects of assembler. There are plenty of good reasons for knowing assembler besides this one, of course, but this is meant to be a specific question soliciting examples and data, not an extended discourse on assembler versus higher-level languages. Can anyone provide some specific examples of cases where assembler will be faster than well-written C code using a modern compiler, and can you support that claim with profiling evidence? I am pretty confident these cases exist, but I really want to know exactly how esoteric these cases are, since it seems to be a point of some contention.

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