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• SSH Tunnel doesn't work in China

  - by Martin

  Last year I was working in China for a few months. I never bothered setting up a real VPN, but just created a SSH tunnel, and changed my browsers proxy settings to connect through it. Everything worked great (except flash of course) but that was fine. However, now I'm back in China but I'm having problems with this approach. I do the same thing as last time, and according to https://ipcheckit.com/ my IP address is indeed the IP of my (private) server in the US, and I'm logging in to my server using a fingerprint I created long before going to China so no MITM should be possible. Furthermore the certificate from ipcheckit.com is from GeoTrust - so everything should be OK However, I still can't access sites which are blocked in China. Any idea how this could be possible?

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• How to configure OpenVPN server to use custom default gateway?

  - by Arenim

  I have a vpn server at address 10.1.0.2 and the server have another ip in it's network -- 10.0.0.2 in his subnet (it's a tun2socks router). But default server's gateway is NOT 10.0.0.2 (and it's ok) but another external IP. I want all the client's traffic to be forwarded through this ip address -- 10.0.0.2. Here is part of my server's config: dev tap0 server-bridge 10.1.0.1 255.255.255.0 10.1.0.50 10.1.0.100 push "route 10.0.0.0 255.255.255.0" ; now client can ping 10.0.0.2 push "redirect-gateway def1 bypass-dhcp" push "dhcp-option DNS 10.1.0.1" push "dhcp-option WINS 10.1.0.1" in fact i want some like push "redirect-gateway 10.0.0.2" How can I achieve this?

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• All browsers hang on windows 7 in tab says 'Waiting for...' need restart

  - by Lakshmila

  I'm having a frustrating problem with browsers on OS windows 7 home premium. IE 10: My web browsing works ok for a while and then pages freeze and tab at top says "Waiting for ...' and never loads. Strangely I can still get to Google search results but if I click anything it freezes. Chrome freezes too and says 'The page has become unresponsive ...kill page' Safari stops also. I have tried clearing cookies, cache, turning off Bitdefender firewall and nothing apart from a restart fixes it. consequently I am forced to restart my computer several times a day to stop this browser hang. I have no idea what could be causing this ..any help greatly appreciated.

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• Recover Bios HP DV9700T windows 7 64

  - by petebob796

  I downloaded the latest DV9700t bios (.59) and ran the update tool in windows 7 64. This seemed to go ok and did the usual system will shutdown in 10 seconds dialog. Updon the reboot nothing happens I get no BIOS screen or anything so I think the bios update went wrong. Which I am annoyed about I have never known a bios update to fail before and lots of people on the internet seem to have had the same problem with the same model. There is a way to recover apparently using crisdisk utility and creating a bootable usb key then holding win+b at power on, unfortunately the utility to make the disk doesn't seem to work in 64 bit versions of windows, the only type I have easy access to. Anyone know a way to create the boot disk in 64?

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• Ubuntu+Mono+Postgres+ASP.NET 4.0. No problem?

  - by wreck_of_u

  Would this be ok? I'm an ASP.NET developer and I'm planning to build "portable" web app servers based on Atom D510 mini-ITX. I have ran Ubuntu 10 with MySQL along with a separate IIS machines (win 2k3, 2k8) before with no problems. But now I'm thinking of "packaging" a web/db server into one small, cheap machine. I thought of Ubuntu/Mono/Postgres/ASP.NET, that it would be a good idea but I'm not sure? I have not actually tried it yet. Your thoughts?

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• Someone try to hack my site, want to understand the log

  - by garconcn

  I have a wordpress site hosted on CentOS 6. After see the following access log, I checked the server, it seems ok. Can anyone explain what does this guy trying to do? Did they get what they want? I have disabled allow_url_include, and restricted open_basedir to web dir and tmp(/etc is not in the path). 190.26.208.130 - - [05/Sep/2012:21:24:42 -0700] "POST http://my_ip/?-d%20allow_url_include%3DOn+-d%20auto_prepend_file%3D../../../../../../../../../../../../etc/passwd%00%20-n/?-d%20allow_url_include%3DOn+-d%20auto_prepend_file%3D../../../../../../../../../../../../etc/passwd%00%20-n HTTP/1.1" 200 32656 "-" "Mozilla/5.0"

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• Multi-monitor resolution and position settings lost after reboot

  - by SoftDeveloper

  I've had two 1280x1024 monitors running for years on an nVidia 8800GT card with no problems. I've now replaced one monitor with a new 2560x1440 one. The card seems to support both fine, however every time I reboot the resolutions and monitor positions revert to the old settings. I've tried upgrading, downgrading, stripping out and reinstalling many versions of the nvidia drivers to no avail. Logging in as another user doesn't help - same problem. Booting into another another OS (Win7 64) works OK, so it is just this OS installation. During boot up everything looks fine (ie native 2450x1440 res) until the nVidia control panel or something is loaded which flips it back into the old mode. I have no old saved nvidia profiles. I can't find anything in the registry relating to these old settings. Its driving me crazy having to set resolutions and realign monitors on every reboot! Can anybody help?

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• Which PSU should I chose? The biggest is the best?

  - by Shiki

  I'm fully aware of PSU's "Active PFC" and that they won't consume the written W all the time. (Makes sense). But now I'm before a PSU replacement (Guys: NEVER buy a Chieftec. Seriously.) The question is: If one can get a bigger one (in my case 750W and 650W) ... should that person go for the bigger one ? (The difference in price is not much). No, I don't think I'll soon use all that much. (Help (if you want of course) to make the question more generic if the question is really not OK in this form. I've been wondering about this for a time already. In my case it would be XFX Black Edition Silver 750W and 650W)

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• Can an UPS be too powerful?

  - by Andy

  Our old network admin bought the top range UPS a few months ago but never came around to setting it up and is no longer with the company. Now the old UPS broke down and needs to be replaced, but an external company that did an audit said that that UPS won't work. Now we are no hardware specialists, but the difference in specs is a higher output from 5A to 8.8A meaning a higher output. But isn't the UPS supposed to give the server the required output anyway? This 'independent' audit does sell its own hardware including UPSes so I'm not sure how much bias they have. Is there a reason why we can't replace the old broken UPS with the new more powerful one? Is there a way we can check to see if the UPS works with our server? ok, i wrote down the numbers again, the Volts and Amps are what are on the back (where you connect up the plugs which seem diffrent from on the front label.) old one APC SmartUPS 1500 220-240V -- 6.8A new one Dell UPS 1920W 250V -- 10A

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• Grails SSL TOMCAT

  - by user974459

  I'm implementing grails with SSL and deployed to tomcat 7.0. I have used spring security plugin for SSL. In tomcat, I added <Connector port="80" protocol="HTTP/1.1" connectionTimeout="200000000" redirectPort="443" /> <Connector port="8443" protocol="HTTP/1.1" connectionTimeout="200000000" redirectPort="443" /> <Connector port="443" maxThreads="200" scheme="https" secure="true" SSLEnabled="true" keystoreFile="${user.home}/.keystore" keystorePass="123456" clientAuth="false" sslProtocol="TLS"/> if I type https://localhost is ok. But my app doesn't work.

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• Remote Desktop closes with Fatal Error (Error Code: 5)

  - by Swinders

  We have one PC (Windows XP SP3) that we can not log onto using a Remote Desktop session. Logging on to the PC directly (sitting in front of it using the connected keyboard and monitor) work fine. From a second PC (tried a number of different ones but all Windows XP SP3) I run 'mstsc' and type in PC name to connect to. This shows the login box which we can enter the correct login details and click OK. Within a few second we get an error: Title: Fatal Error (Error Code:5) Error: Your Remote Desktop session is about to end. This computer might be low on virtual memory. Close your other programs, and then try connecting to the remote computer again. If the problem continues, contact your network administrator or technical support. None of the computers we are using are low on memory (2Gb+) and we let windows manage the virtual memory side of things. We do not see this with any other PC and do use Remote Desktop in meeting rooms to connect to user PCs with no problems.

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• Host data transfer limit calculations and network protocol headers

  - by UpTheCreek

  OK, this might be a really stupid question, but... I'm building a web app that utilises websockets. There's fairly rapid messaging going on, so I've been taking a look at the network traffic with wireshark, to see if there's any way of reducing the amount of data we are sending over the wire, and hence costs. A typical message has approx 150 byte data payload, and according to wireshark the lower layer stuff takes up about: Ethernet: 14 bytes IP: 20 Bytes TCP: 20 Bytes My question is, are these network headers included in data transfer calculations? What about TCP ACK messages? (another 54 bytes according to wireshark) This may seem petty, but because we have so much messaging going on, and because the payload is a similar size to these headers, it's significant.

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• How to automatically copy a file uploaded by a user by FTP in Linux (CentOS)?

  - by Buttle Butkus

  Outside contractor says they need read/write/execute permissions on part of the filesystem so they can run a script. I'm ok with that, but I want to know what they're running, in case it turns out there is some nefarious code. I assume they are going to upload the file, run it, and then delete it to prevent me from finding out what they've done. How can I find out exactly what they've done? My question specifically asks for a way of automatically copying the file, which would be one way. But if you have another solution, that's fine. For example, if the file could be automatically copied to /home/root/uploaded_files/ that would be awesome.

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• Windows 7 root certificate updates

  - by hstr

  I work for a company that uses Windows 7 for end user computing. The Windows 7 computers are updated via a WSUS installation, and access to Microsoft Update is blocked. We have a problem with a number of websites, who's certificates appears to be invalid, though they are perfectly ok. The problem is, that Windows 7 apparently does an on-demand update of root certificates through Windows Update, rather than rolling out a monthly update, as with Windows XP. Now that Windows Update is blocked, how should root certificates be updated? It appears that WSUS is not handling this feature. Thanks in advance.

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• Windows server 2003SP2 as LDAP replica master for Mac OSX 10.6

  - by FrancoR

  Hello there, we have a single domain controller with Windows 2003 with few child. All the users are in the main DC. We have already created a connection from AD to Mac Xserve 10.6 and can read all the users, but: 1. If the DC goes down (or the net), Mac lose all the users, so no file access, no emails, no nothing. 2. the users are in read only. Mac admin cannot reset password, change attribute and so on. What we need is a stable environment where both AD admins and LDAP admins can manage the users; if one server goes offline the users of the other server should work (email, shared folders) just fine. Thanks in advance P.S. we already tried to connect the MacOSX to Windows LDAP, instead of AD, but we're unable to do it: MacOSX requires DNS IP (gotcha), user admin and password (ok) and a root LDAP password we're unable to find any reference of it in Windows 2003.

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• What is the world wide web? [closed]

  - by think123

  I don't know where to post this question, so please move it if necessary. Ok, so I've heard of how the professional hosting companies can create 'links' to the world wide web to register an unregistered domain. So that's where my question comes from. Is the world wide web a server to which servers link? Is it created by abstract linkage? I'm not sure. Also, what does it mean for the DNS to be updated throughout the whole world?

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• Is rsync corrupting my RAR?

  - by Mark Henderson

  We have two qnap devices - one in our datacentre and one off-site. We have hundreds of password protected RAR files stored on the qnap that contain virtual machine image snapshots, with approx 20 of them being created each day. We synchronise the two devices using rsync, and it looks like all the files are being rsynced OK - they come over and have the same file size and all the files are present and accounted for. However, when I try to open the RAR files on the remote site, I get Cannot open \\qnap01\FromDatacentre\Snapshots\DB001SQL1-20110626.rar I can open the RAR files on the local site just fine, so I assume that something is getting mangled during the rsync procedure. However, the older files (pre 2011-06-20) work just fine, it's something that's only started happening in the last week. There haven't been (as far as I know) any changes to any of the devices, setup or configuration in that time. Obviously something has changed though. Where should I start investigating?

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• Is it safe to set MySQL isolation to "Read Uncommitted" (dirty reads) for typical Web usage? Even with replication?

  - by Continuation

  I'm working on a website with typical CRUD web usage pattern: similar to blogs or forums where users create/update contents and other users read the content. Seems like it's OK to set the database's isolation level to "Read Uncommitted" (dirty reads) in this case. My understanding of the general drawback of "Read Uncommitted" is that a reader may read uncommitted data that will later be rollbacked. In a CRUD blog/forum usage pattern, will there ever be any rollback? And even if there is, is there any major problem with reading uncommitted data? Right now I'm not using any replication, but in the future if I want to use replication (row-based, not statement-based) will a "Read Uncommitted" isolation level prevent me from doing so? What do you think? Has anyone tried using "Read Uncommitted" on their RDBMS?

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• xenserver: xe command never returns?

  - by ethrbunny

  I'm trying to port a xen server 6.2 pool to a new IP address range. I've got three servers total: 2 currently at their new IP but no longer in the pool and one remaining. I'm trying to set IP address information on the two disconnected ones using the xe command and all of its variants. Oddly enough, it never returns with any values. xe host-list It just sits there until I ctrl-c it. The server is still awake and responding though. I can enter other commands (EG ifconfig) and they work fine. If I enter this same command on the remaining server in the pool it works ok. I've tried restarting the toolstack and even rebooting. No change. What am I doing wrong?

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• "The requested operation could not be completed due to a file system limitation" 3202

  - by user46529

  I backup SQL Server database and it fails BACKUP DATABASE dd TO DISK = '\backupServer\backups\dd.bak' WITH COMPRESSION, CHECKSUM, NOFORMAT, INIT , BlockSize = 65536 , BufferCount = 2200 , MaxTransferSize = 4194304 The backup size is 3TB and I have 6TB free space on bacup server. I am using backup parameters per SQLCAT whitepaper. Everything works ok when I backup to local HDD and it always fails when I backup to network share. After about 6 hours. Can't find why. Thank you. Yes. The backup over the network is fastest and saves me 3Tb of local disk space :) Thanks for pointing to the memory issue. I left 4Gb to OS and it worked!

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• Postfix smarthost with diffent relayhosts and sender dependant authentication

  - by mattinsalto

  I've setup postfix as smarthost with different relayhosts and sender dependant authentication. Everything works ok, but I have a performance question. Is it better to send all the email corresponding to a domain through only one account? I mean, now I'm sending each message authenticating to the relay host with the sender credentials. Example: If I have 5 email accounts and I send 10 simultaneous messages from each account, How many times is postfix login to the relay host if I have sender dependant authentication? 5 times? once for each sender 50 times? once for each message If I send all the messages corresponding to one realy host through one account, how many times does postfix login to the relay host? only once? Thanks in advance.

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• Amazon - install a complete server on EBS

  - by user1169575

  is it possible to install a full working OS with a webserver, db, and all needed stuff on an EBS storage? If so, would I immediatly gain benefits by mounting this EBS on a better instance? Otherwise (if I cannot install a complete image, or if you don't think it's reasonable) can I install the software so that I only need to mount the EBS on a new instance to have it working? I purchased a Medium Reserved Instance, but when there will be the need to get a better instance I'd like to move the whole db/website, I'd simply buy a better instance and then attach the EBS. Is it possibile? I'm imaging about it like an hard drive that would be mounted on a better server. Of course, more RAM would allow me to increase caching limits, and that's ok, but I don't want to reinstall anything (the main website is a magentocommerce and it's pretty painful to move it). P.S. is the Standard EBS (100 IOPS) valid or do I need to choose a Provisioned IOPS (up to 1000 IOPS)?

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• New power supply, now computer doesn't recognise hard drive?

  - by Mike

  Ok, I bought a new power supply, because my old one was too damn loud. I hooked it up to my PC, turned it on, everything is looking fine, start up detects my DVD drive, 2 hard disks.. then I get the message "BOOT FAILURE INSERT SYSTEM DISK". Now I've seen some other people talk about going into BIOS and changing the start up to the HDD and not the CD.. well I've done that and it doesn't help. If I let windows load up and it asks me to which partition I wish to install windows, no partition is present. It's as if after the initial start up the drives arn't being found. I plugged my old (but loud) PSU back in, connected up all the cables, and it works perfectly. Why does the new PSU not detect my HDD's after the first BIOS screen start up? Any ideas? :)

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• Help recovering lost text from a refreshed Chrome webpage (it was in the clipboard as well)? [closed]

  - by tobeannounced

  Possible Duplicate: Chrome: where is the location to save browse temporary files Ok, so here's what happened - and yes, it was pretty stupid by me: I wrote up and submitted a post on Stack Overflow It was not suited to be placed on Stack Overflow as someone pointed out to me, so I deleted the post (this was a few hours ago) I copied the text into a new question page on Super User, but didn't submit it yet I accidentally just refreshed the webpage that had the text, and the question has now been deleted from Stack Overflow I have Lazarus installed, however the Chrome version doesn't have many features and the text was not recoverable from there. I do not have a clipboard manager, but the text was copied to my clipboard - so is there any way to get this back (Windows 7)? Although the post on Stack Overflow was deleted, I suppose it would have existed in my cache - could I recover it from there? Would the post on Stack Overflow exist in an rss feed anywhere? Many thanks, and I hope I can find this - and I am sure that the solution will prove valuable for me (and others) in the not too distant future once again.

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• Hardware question re Hauppauge WinTV-HVR 900 HD video/tv capture unit used with laptop with HDMI output laptop HDMI connection

  - by Bill

  I've ordered a Hauppauge WinTV-HVR 900 HD video/tv capture unit. It is mainly for use with my HP desktop running Windows 7 Professional, but I will want to use it occasionally with my partner's HP laptop running Vista Home Premium. The latter has an HDMI output which works perfectly with my LG 42" LCD TV, enabling display of BBC iPlayer and other catchup services. Will the live or recorded HD signal from the WinTV-HVR 900 HD connected to the laptop's USB input be output on the laptop's HDMI socket as HD? Come to that, will SD content be output? The reason I ask is that I had a problem with a Pinnacle unit which displayed OK on the laptop's screen but not on the TV screen (which did display all the normal Windows material). I've tried the Hauppage website, but it doesn't even acknowledge the existence of the WinTV-HVR 900 HD!

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