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• Red Hat 6.5- sysctl -w net.ipv6.conf.default.accept_redirects=0

  - by kjbradley

  I am in the process of writing a Red Hat 6.5 Kickstart disc with hardened security. I have run a program to determine where the weaknesses are in my system, and apparently there is a medium severity problem by accepting IPV6 redirects. When I implement the following line in my post script in my kickstart, I can't access any websites externally with wget, or ssh/scp in from my computer. sysctl -w net.ipv6.conf.default.accept_redirects=0 Is there a workaround to this so that the system will still be hardened but I will be able to access systems that are external?

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• Snapshots are disappearing from Time Machine. Why?

  - by AntonAL

  I have TimeMachine enabled for my external HDD. I'm triggering backups manually 2 times per week. I have noticed, that some snapshots, that i made, are gone. I noticed this behaviour several weeks later, but i had doubts. To make it sure, i've recorded screen video with listing snapshots in TimeMachine. After watching my screen recording today, I'm sure, that for Augusut i had 9 snapshots. Now, i have only 3 of them. What's happening ? I had no crash disk reports, errors etc

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• Why do I have inconsistent network issues with my laptop's wireless?

  - by Jason

  I'm having trouble with my laptop Internet connection. It's patchy at best and resets or freezes a lot. The signal strength is also random. I thought it might be a driver issue but now I don't know. Three other computers using the same wireless network run well. I've switched out wireless routers so I don't think it's the router. I thought it might be the laptop's internal wireless card but I just bought an external USB network card and I'm still having problems. Specs Lenovo T-60p Windows 7 Ultimate Edition Patches/drivers are up to date I only use one of the below at a time, disabling the other: Intel PRO/Wireless 3945ABG v. 13.3.0.137 (Internal wireless) Medialink Wireless-N USB 2.0 Adapter (USB wireless) Any ideas on what might be the problem?

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• Recovering data from a corrupted disk

  - by r_honey

  I use an external harddisk to backup my data (it had 3 partitions). Last week when I plugged it in, the OS (Win 7) hung up and I had to force re-boot the machine. When I turned it back on, the system just did not detect the hard-disk. It was last Sunday and I had to give up after sometime. Now I return back next Sunday (today) and when I plug it back-in to the machine, the OS detects the disk as well as all the 3 partitions on it. But it says all 3 are unformatted and I cant access any of them. Is there any way to recover data from the 3 partitions (I tried PC File Recovery and Recuva from PiriForm but neither detected these partitions).

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• Wifi and eth behavior

  - by r00ster

  I have a wireless router 150M Wireless Lite N Router Model No. TL-WR740N / TL-WR740ND. Normally, when I'm connected to the local network using eth0 I can ping other machines by issuing ping name. When I'm connected through wifi I have to issue ping name.domain.com. The machine is only visible in intranet. How to achieve the same behavior with wifi? The second problem is, that I can not connect to some external sites through wifi but through eth everything is ok. I guess that is related to some port forwarding, but I'm not sure. How can I resolve this issue? EDIT: I'm using Linux Mint.

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• Cannot access internal network on OSX 10.6.6

  - by cabuki

  Last week, I began having trouble connecting to our internal web servers. Usually, a refresh would take care of it or switching to a different wireless network, but as of yesterday, this wasn't enough. We have an internal DNS server using dnsmasq and a private internal host name (us.lcl). Once I started having more issues with the names not resolving, I tried pinging the server. Using the internal host name (s1.us.lcl), it failed. I tried using the IP address, but that also failed. I have no problems accessing external sites with the exception of it being a bit slower than normal. A reboot yesterday at lunch time after following the instructions here seemed to fix the issue, but when I came into the office this morning, it had stopped working. As of this posting, I cannot ping, ssh or access the web server using the internal host name or ip address. I'm the only one running 10.6 in my office and none of my colleagues has this issue.

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• Changed domain A records for new static ip, but no mail

  - by Tim the Enchanter

  We have recently changed our ISP, I have changed the mail and mailserver DNS A records for our domain name to point to the new external static IP address assigned to the router by the new ISP (the MX record points to mail.<mydomain> as always) but I am not getting any email (though sending email works). Do I just have to wait will the change propagates? I am slightly concerned because I can connect to the web email service made visible through the new router which suggests that the mail.<mydomain> static I.P. address change has happened. Have I missed something?

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• Hard drive self monitoring system

  - by Hoorayo

  I have a 500GB HDD on my desktop, and there are two partitions as C and D. The computer would not start and shows me a error message. Notice - Hard drive self monitoring system has reported that a parameter has exceeded its normal operating range. Dell recommends you that you back up your data regularly. A parameter out of range may or may not indicate a potential hard. So I took the hdd out of the desktop and made a USB external HDD. My laptop recognizes the hard drive as “I” drive and “J” drive. I am able to click “J” and see folders and files. But there is no response when I click “I” while it makes weird clicking sound. Can anyone explain why I drive doesn't work while J drive works on same physical hard drive? Is there anyway that I can fix?

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• Need to configure multiple default gateways for four seperate physical network ports for a FreeBSD Webserver

  - by user20010

  I need to configure default gateways for four separate physical network interfaces for a FreeBSD Webserver. Basically, this is a web server that needs to be accessed by multiple WANS. I've been using various online resources, and a combination of setfib, pf, and ipfw. This web server will be deployed in multiple sites where access to next hop router info is not available, so we can't use static routes. We've used setfib to successfully create multiple routing tables and can ping beyond every default gateway we've created. Using setfib # ping ip.addr.what.ever we can ping anything available on a wan and beyond the router. The problem is we can't get Apache web server (port 80) traffic to route out when external users access the server(box). Multiple people have examples of binding setfib to ipfw commands, but none of them seem to work.

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• where is this SPF problem occuring

  - by Saif Khan

  Hi, Inbound mail to a specific user is been forwarded to his external mailbox at another domain. Add mails are routed correctly with the exception of one domain. When mail are sent to users of my domain, including that user, the mails are delivered to everyone except him...as the mail admin I am getting the message The following recipient(s) cannot be reached: usermailbox on 1/10/2011 1:27 PM There was a SMTP communication problem with the recipient's email server. Please contact your system administrator. email.speedimpex.com #5.5.0 smtp;587 [email protected] sender domain does not match SPF records I am sure this has nothing to do with my mail server, however, can someone confirm?

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• USB 3.0 hub; what can it power?

  - by pouzzler

  I own an Asus UX31A laptop, equipped with 2 USB 3.0 ports. I would like to connect several USB devices to one of these ports, using a USB 3.0 hub. 1) Am I correct in assuming the Asus "USB Charger+" commercial blurb corresponds to the USB 3.0 standard "Battery Charging Specification 1.2", and furthermore inferring that the laptop can deliver 1.5A through a USB port? 2) Does a powered external USB 3.0 hard drive draw on the USB power lines? 3) I would like to connect the aforementionned drive, an android phone, and a 200mA rated optical mouse to an unpowered USB 3.0 hub, itself plugged into the laptop. Should my above assumptions be false, would this setup be able to power all three devices? Thanks to the usb guru who'll settle my fears to rest. Best regards, Sébastien

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• Wifi and eth behavior

  - by r00ster

  I have a wireless router 150M Wireless Lite N Router Model No. TL-WR740N / TL-WR740ND. Normally, when I'm connected to the local network using eth0 I can ping other machines by issuing ping name. When I'm connected through wifi I have to issue ping name.domain.com. The machine is only visible in intranet. How to achieve the same behavior with wifi? The second problem is, that I can not connect to some external sites through wifi but through eth everything is ok. I guess that is related to some port forwarding, but I'm not sure. How can I resolve this issue? EDIT: I'm using Linux Mint.

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• Rsyslog : copy with change the facility

  - by Dom

  I have saslauthd with save the logs in LOG_AUTH in our rsyslogd server. It can't be changed without recompiling, and I don't want to do that. I would like to see all the LOG_AUTH in LOG_MAIL, because I do an export to an external machine, and I would like to see all the saslauthd logs in LOG_MAIL in the distant server. Of course, in local I can add "auth.* " in the mail.log file section, but the export will not be in the right file because I filter in export by syslog Facility/Priority. How can I export all the AUTH logs into MAIL logs ? Thanks

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• Where do I find Nmake for Windows XP

  - by Shrujan

  Regarding BioPerl installation in Windows XP, I have installed Active Perl in Windows XP, and by using Perl Package Manager I have installed the BioPerl Repositories too. But I am not able to run the BioPerl yet. While running the BioPerl program in emacs it is showing the following error: make -k 'make' is not recognized as internal or external command, operable program or batch file I have tried to install Nmake for Windows but this error is showing. No webpage was found for the web address: http://download.microsoft.com/download/vc15/patch/1.52/w95/en-us/nmake15.exe How could this be resolved?

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• Prevent specific applications from being run as administrator

  - by Unsigned

  Background Most installation toolkits have the ability to launch, automatically or otherwise, external programs after installation. This is often appears in the installer via such options as "Show readme", or "Start program". Issue The problem is, many of these installers are poorly coded, and do not drop permissions appropriately. For example, starting the application automatically, or opening the application's homepage in the browser, often results in launching the application or browser with the installer's Administrative privileges, or a "High" UAC integrity level! This has the potential to open up security breaches, by opening up the installed application, or a web page (and possibly browser add-ons), that are now running with elevated permissions. (This is the reason I strongly recommend never choosing auto-launch options when installing software.) Question The question is: Is there a way to prevent certain applications (such as a web browser) from ever being launched with Administrative privileges, i.e., an automatic drop-privilege?

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• Prevent applications from being run as administrator

  - by Unsigned

  Background Most installation toolkits have the ability to launch, automatically or otherwise, external programs after installation. This is often appears in the installer via such options as "Show readme", or "Start program". Issue The problem is, many of these installers are poorly coded, and do not drop permissions appropriately, for example, opening the application's homepage in the browser... launching the browser with the installer's Administrative privileges, or a "High" UAC integrity level. This has the potential to open up security breaches, by opening up a webpage (and possibly browser addons), that are now running with elevated permissions. Question The question is: Is there a way to prevent certain applications (such as a web browser) from ever being launched with Administrative privileges, i.e., an automatic drop-privilege?

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• Zentyal Server : Setting up secure VPN Client

  - by JustShrey

  I have officially exhausted pretty much all my google-fu trying to set this up so I'm asking my question here. For the record, I am a mid level rookie who has played around with servers in his spare time but have never worked with Zentyal Server. Now, I have been able to set up the server as a gateway, with one Network card being external and the other facing the internal Network. The Internal network computers are able to access the internet without any issues. What I need to do is to setup a open-vpn client on the central server so that all Internet data goes though the secure VPN session. As far as I can see, I can't set up the vpn session through the web admin page. Could somebody point me in the right direction? How would I go about doing this? Regards Shreyas

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• my.ini optimization on Windows 2008 R2 VPS

  - by MKphpDev

  I have a vmware VPS running Windows Server 2008 R2 Enterprise that has performance issues with MySQL. Every few minutes, MySQL stall for few seconds then responed to queries. I'm sure that my.ini need to be optimized, but unfortunately, I don't have any idea of my.ini configuration. What's running on the server: 2 small wordpress blogs, 1 vbulletin forums (approx. 1.2 GB database, and increasing), small database for some sort of plug-ins (no more than 4000 records) Server Info: Processor: Intel Xeon X5550 @ 2.67GHz, RAM: 6 GB (memory useage never exceeded 2 GB), MySQL 5.5, PHP 5.3.10, IIS 7 current my.ini: [mysqld] default-storage-engine=INNODB sql-mode="STRICT_TRANS_TABLES,NO_AUTO_CREATE _USER,NO_ENGINE_SUBSTITUTION" max_connections=250 myisam_max_sort_file_size=20G innodb_additional_mem_pool_size=256M innodb_flush_log_at_trx_commit=1 innodb_log_buffer_size=8M innodb_buffer_pool_size=512MB innodb_log_file_size=128M innodb_thread_concurrency=10 key_buffer_size = 512M myisam_sort_buffer_size = 8M join_buffer_size = 256K read_buffer_size = 256K sort_buffer_size = 256K table_cache = 4000 thread_cache_size = 200 wait_timeout = 30 connect_timeout = 10 tmp_table_size = 32M max_allowed_packet = 1M max_connect_errors = 10000 query_cache_size = 16M query_cache_limit = 2M query_cache_type = 1 query_cache_min_res_unit = 1024 query_prealloc_size = 16384 query_alloc_block_size = 16384 skip-external-locking read_rnd_buffer_size=1M max_heap_table_size=16M thread_concurrency=8 [mysqld_safe] open_files_limit = 8192 [mysqldump] quick max_allowed_packet = 16M [myisamchk] key_buffer_size = 128M sort_buffer_size = 128M read_buffer = 2M write_buffer = 2M any help with that, please?

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• make a folder/partition on one computer appear as a mass storage device to another?

  - by user137560

  Is there anyway to make a folder or a partition on a computer (Linux or Windows) act like a mass storage device to other computers or devices when connected with a Male-Male USB cable? For example, I have a Windows 7 computer with 2 partitions, C and D. I would then connect that computer to another computer or a Smart TV using a Male-Male USB cable, and the other computer or device recognizes a folder/partition on current computer as a mass storage device. Is this possible? If not, is there any USB switch that can connect an external hard drive or flash drive to both a computer and TV without the need to manually switch them? (I know about some USB switches, but they only support automatic switching with some certain types of printers, not with mass storage)

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• Sync Linux to Windows 2003/2008 Natively

  - by user26753

  Without using any external packages for Windows, can Linux synchronise it's clock to a Windows 03/08 Server natively? I've tried it using various NTP packages for Windows but would like to use just Windows software for this. EDIT: I've tried the below however it doesn't work. I've put TimeSource in /etc/hosts, stated server TimeSource in /etc/ntp.conf however when I do a service ntpd start it doesn't sync (it's 3 minutes out at the minute). I then stopped the NTPD and did a ntpdate TimeSource, thinking it would sync and then I'd start the NTPD once it's got the time, and it says: no server suitable for synchronization found. Though I can ping it. Any thoughts?

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• Is it possible to host a website with Apache HTTP through a ZyXEL EQ-660R modem and a Netgear WGT624v3 wireless router?

  - by Vortico

  Essentially, I have a spare desktop computer I'd like to turn into a web server, but my modem and wireless router are very difficult to work with. I installed Apache HTTP and successfully hosted a test page which can be accessed anywhere on the LAN. However, I'm having trouble setting up the server to be accessed from my external IP address. I was supplied with a ZyXEL EQ-660R DSL modem by my ISP (CenturyLink) and bought a Netgear WGT624v3 wireless router in which to connect my laptop and spare desktop. ZyXEL's website is no help, and I don't think much of the problem is with the Netgear router. I've played with many settings and have tried to forward port 80 from the modem, but I've had no luck. Could someone direct me toward a solution or recommendations for more promising hardware? Or should I admit defeat and explore other hobbies? :)

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• How does Linux's unlink on a NTFS filesystem differs from Window's own implementation?

  - by DavideRossi

  I have an external USB disk with an NTFS filesystem on it. If I remove a file from Windows and I run one of the several "undelete" utilities (say, TestDisk) I can easily recover the file (because "it's still there but it's marked as deleted"). If I remove the file from Linux (I'm using Ubuntu) no utility can recover the file (unless I use a deep-search signature-based one). Why? It looks like Linux does not just "mark it as deleted" but it wipes away some on-disk structure, is this the case?

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• Setting up VPS hosting

  - by RobinFTW

  I'm trying to set up my own vps hosting. It wont be a paid service, just an experiment for me and some nerdy friends. What I'd like to be able to do is this: Run multiple virtual servers on 1 external IP. These servers can run anything from Minecraft servers to simple http servers. They will also need to be accessible thru SSH. What I don't get is how I can address these servers using domain names. I've done some research and found out that I could use Vhosts with Apache. However this only applies to http servers. It was also suggested I'd use a reverse proxy(squid) but this also only applies to http requests. I could just use different ports for different servers, but thats not ideal and not what I want. Can someone suggest a setup? Maybe some tutorials or anything.

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• Force firefox to open pages in a specific tab using command line

  - by user36306

  Hey Guys, Here's the challenge--I developed Softphone Screenpop PHP App that takes caller id info and searches for a match in our db, also allows us to collect call statistics. Great for our management but it's driving our reps nuts. We use firefox here and when our softphone pops to the external page, every time it opens in a new tab, the girls quickly get 5-10 open and it becomes confusing. Our softphone will also run command line. I wondering if there is a way to have a URL open in a certain tab. Otherwise does anyone have any other ideas? Thanks!

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• I suspect that my HDD is causing hardlocks, as all other components have been replaced. How can I check this theory and solve the potential cause?

  - by user867814

  I have had this problem over quite a while now, thorough multiple Linux kernel versions and distributions, as well as replacement of all components, aside from my main HDD - RAM, GPU(twice), mother board, CPU, power supply. What happens is, at one point during the operation of the PC, it will hardlock - everything stops working, external HDD is not shut down correctly and continues to spin until I plug it out and in, there are no system/kernel logs of any kind, and no otherwise nothing that would suggest a cause. Another reason for my suspicion is that the failures happen almost exclusively during HDD read/write activity - shutdown(happens nearly 1/3 of the time so far, it's only been few days though), launching programs, and once during operation of apt. I hope the post is descriptive enough, if you need any additional info, ask(and tell me how to prepare/obtain it), and I will provide. If I'm wrong, point me in the right direction. Thanks in advance.

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