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• (Tough) Security Queston about ISP companies

  - by buyrum

  I want to ask a question. One ISP was criticized for it's low security conditions, and when i heard this i started to think: If one gets an unauthorized access to the mainframe computer / internal network of the ISP, then wouldn't he be able to sniff all the traffic ? Because the ISP is providing the internet connection for the user so all traffic that sends and transmits a user travels via the ISP, right ? What security solutions (talking about computer security) are being implemented by other ISP in order to protect themselves and their users ? If all the connections are being sent via a special computer, how secure it is and how can be we sure that it's really safe ? And what kind of computers are those who serve as backbones for the ISP ? Thank you in advance for your help.

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• which factors determines the speed of a processor? [closed]

  - by Deb

  I think that clock rate of processor determines the speed of core, in my case it is 1.86GHz. But If I am not wrong, it also determines that how much energy it will consume. If you have more frequency then more power it will consume. I choose Power Saver scheme to increase my battery life, however it reduces my core speed to half of the actual speed. I understand this happens because of SpeedStep, but I don't see any slowdown of my computer. So my problem is why we have such high frequency cores as it uses too much power. We can use low frequency cores. Actually I get confused between the two terms Speed of the processor and its frequency. So how much important is the frequency of core in case of any processor.

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• NetApp and SQL Server?

  - by Edinor

  Do you have any good or bad experiences to share running SQL Server OLTP Systems on NetApp appliances? I have been working with a small, relatively low-volume cluster with a lower-end NetApp device, and I have found the environment to be generally unstable, at least compared to my experiences with other SANs, iSCSI arrays, and DAS setups. I struggle to believe that RAID DP and WAFL are more than fairy-dust technologies. A solution has been proposed to me that I just need a bigger, better NetApp, with PAM cards and other cool technology I've not heard of, and I feel like I would be better off spending a quarter of that on good direct-attached drives and a beefy server. At the same time, I feel that an Enterprise-class SAN should be something I can count on to be consistently a more stable, better performer than the less expensive solution I might propose. Are you a SQL Server DBA in an OLTP environment and love your NetApp? If you don't like them, why not?

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• hp smart array lock up code 0x15, what is that? (or where can I get a list of descriptions of HP smart array controller lock up codes)

  - by user47650

  Hi, I've had a couple of Dl180 6g boxes hung over the last week, each have a P410 smart array controller. upon reboot the server has indicated that a controller failure event occurred and the previous lock up code was 0x15 - the server rebooted without issue. However there was nothing in the IML log, but the ADU report provided the following; Trap Address High Or Post Results Lockup Reason Or Post Error RIS Updates Or Post Error Detail Firmware Version Trap Address Low 0x8087 0x0015 0x0000033e 0x015e 0xd65c any suggestions on what that code is, my google fu failed. And hp support have not responded with any detail as yet.

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• Software for failover across multiple external hosts

  - by Lin

  I have multiple webservers with the same content, hosted across different providers. However, I can't seem to find a nice, simple failover solution. Load-balancing software (Pound, HAProxy, etc.) are unnecessary, and I need the flexibility to manage over 100+ domains, so the paid DNS failover solutions I've found are too expensive. So far the simplest solution I've thought of is just to set a very low TTL (30min - 1hr) in each zone entry on my nameservers (running BIND). Then, continuously monitor each server, and temporarily remove failed servers from zone entries. But this seems like something that should be currently available. I only have root access to different VPSes running CentOS. Any suggestions? Thanks!

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• How does one calculate voltages for overclocking?

  - by TardisGuy

  So, all I know is voltage and clock have something to do with each other. Unstable if too low voltage Too high voltage, and too much heat. or higher voltage + lower clock may heat less than that voltage at higher clock. The reason why im asking is because if I can learn how the power vs speed works, Then i might be able to project some kind of thermal curve to find out where my perfect overclock might be (without 50 burn-ins) But, as is apparent im sure. I have no idea what im talking about. If anyone can help me learn more about this; throw me a page, a macro, whathaveyou I will bow before your awesomeness and... Mail you a phantom hand written thank you letter. Some clarification Rev 1 What im trying to learn: is how much power a cpu is using with measurements (Core Voltage) vs (Clock speed) - It would answer the question: Would a 1.4v core @ 4.0Ghz use as much power as a 1.4v core @ 3.0Ghz?

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• Anyone have experience with Silicon Mechanics 4-Node Machines?

  - by Matt Simmons

  I'm taking a look at buying some new servers (small infrastructure, 2 racks, etc), and although I like a lot of the features in blades, I'm looking at the price point for Silicon Mechanics' 4-node machines. http://www.siliconmechanics.com/i27091/xeon-2U-4-Node.php It's a bit like a mini-blade enclosure, but has no shared resources, except for the redundant power supplies. A single point of management would be great, but for the low price point here, I'm possibly willing to give that up, if the server quality is adequate. Basically, have you used these machines? Any problems? Anything you like?

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• Disable drop shadows around windows or the menu bar on OS X

  - by Lri

  Nocturne has an option for disabling shadows around windows. But it's only available in night mode, and changing the mode (like when opening the application) causes an annoying screen flash animation. There's no way to disable the shadow under the menu bar either. MacThemes Forum / Removing the menubar dropshadow has a link to a .psd for making special desktop backgrounds that cancel out the shadow under the menu bar. But it only works if that area of the desktop picture has a low enough brightness. Some applications that cover the desktop (like DeskShade) also cover the menu bar's shadow. That's not a real solution though. Unsanity's ShadowKiller stopped working in either 10.5 or 10.6. (It does still work on 10.7.2, but the website says "NOT compatible with Mac OS X 10.6 Leopard", and I couldn't get it to work on a 10.6 installation.) Related: How do I decrease the window shadow in Mac OS X? - Super User

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• Suggestions for SOHO networking gear

  - by jakemcgraw

  I'm a software developer in my day to day job but have landed a contract position to spec out and install the computer equipment for a small office. Ease of use (easy installation, low maintenance and good support) is priority number one, it supersedes price by a wide margin. The installation we had in mind would support up to ten workstations. I was originally going to go with Netgear hardware for firewall, switch duties: Firewall: NETGEAR UTM25-100NAS Switch:NETGEAR GS724T but have been told Sonicwall firewalls are easier to configure. So, sysadmins, if ease of use was priority number one, what hardware would you purchase for firewall, switch duties?

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• Realtek audio AC 97 5.1 on Windows 7: Terrible subwoofer quality

  - by Edu

  I have a media center PC with on-board Realtek AC97 Audio. I have been using Windows XP for a couple of years with great audio quality. I just upgraded this PC with Windows 7 and installed the latest Realtek drivers from http://www.realtek.com.tw/downloads/ At the testing screen, all the speakers works correctly (including subwoofer). Despite that, while playing any movie or music, the subwoofer quality is terrible. From it it just comes noises, in the correct rhythm but quite low and quite out of tone. I compensated the loudness by putting the other speakers lower but the sound of the subwoofer is really terrible. Is there anyone facing the same problem? Does anyone have a workaround for that? PS.: I had gone past the steps given in Terrible noises from subwoofer of ACER Aspire 6930 with Realtek sound chip but still I have a bad quality of sound. My problem is very similar to the one in http://www.mp3car.com/car-audio/143796-realtek-hd-audio-is-robbing-my-subwoofer.html

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• Linux / apache web-server segmentation fault warnings

  - by jeroen

  Lately I have been receiving a lot of segmentation fault warnings on my web-server. The warnings look like: [notice] child pid xxxx exit signal Segmentation fault (11) I have consulted with the server provider (it is a dedicated redhat enterprise server) and they could not find anything. What I have done so far: Since the error I have already tried the following: I have added more ram I have turned off / turned on several php modules (they sent me to a web-page someone had the same problem, caused by an excessive amount of php modules) At the moments the warnings occur, there seems to be plenty of free ram left and the number of processes is very low (the number of httpd processes is about a quarter of the maximum allowed). What can be causing these errors? Edit: current versions apache: 2.0.52 php: 5.2.8 RHEL 4 Edit 2: Although I asked this a long time ago, I never was able to solve it until I upgraded to php 5.3.

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• Configure Nagios To Alert Depending On Host Group That Service Alert Originates From

  - by StrangeWill

  So my setup: Services are shared between all hosts (CPU/RAM/Disk/Services). Hosts are split into two main groups: "Production" and "Development". We have two contact groups: "Production" and "Development". Lets say my development SQL server runs low on RAM, I want it to only alert those in "Development" contact group (this service is of course assigned to a host in the "Development" host group, using the shared RAM monitoring service). I'm pretty much stumped on this... I can't configure it at the service level (they're shared there), and I can't seem to get escalations to do it for me either... Do I need to use service groups along with escalations and bite the bullet on building that list? Or am I missing something stupidly simple? I'm using Centreon for configuration if that helps.

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• Double default gateway ubuntu server

  - by Elena

  I've just installed an Ubuntu server 9.10 on an EEEBox. This is my /etc/network/interfaces # The loopback network interface auto lo iface lo inet loopback auto wlan0 iface wlan0 inet static address 192.168.48.16 netmask 255.255.248.0 wireless-essid mynet auto eth0 iface eth0 inet static address xx.xx.xx.xx netmask 255.255.255.224 gateway xx.xx.yy.yy When I restart /etc/init.d/networking, I can access the eth0 ip address from the internet and I can ping the machines in my wifi network mynet. Everything works fine and I have one default gateway. But after some time if I check again the route I just find two default gateways: one is correct and is the previous one, but the other is the one of the wifi network. I have a quite low signal of mynet where my server is and sometimes the wifi just disconnect and then reconnect again. Then I think that this can be a problem and the dhcp of the wifi net, when reconnecting it also add a default gateway. Any idea on how to resolve this issue?

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• Experience with AMCC 3ware 9650se raid cards? Ours seems dead

  - by antiduh

  We have a 8-port 3ware 9650se raid card for our main disk array. We had to bring the server down for a pending power outage, and when we turned the machine back on, the raid card never started. This card has been in service for a couple years without problems, and was working up until the shutdown. Now, when we turn the machine on, the bios option rom that normally kicks in before the bootloader doesn't show up, none of the drives start, and when the OS tries to access the device, it just times out. The firmware on it has been upgraded in the past, so it's possible we've hit some sort of firmware bug. We're using it in a Silicon Mechanics R272 machine with gentoo for the OS. The OS eventually boots, but alas, without the card. We've ordered a new one, but I'm worried that if we replace the card it won't recognize the existing array. Has anybody performed a card swap before? Any help would be greatly appreciated. Edit: These are the kernel errors we see: 3ware 9000 Storage Controller device driver for Linux v2.26.02.012. 3w-9xxx 0000:09:00.0: PCI INT A -> GSI 18 (level, low) -> IRQ 18 3w-9xxx 0000:09:00.0: setting latency timer to 64 3w-9xxx: scsi0: ERROR: (0x06:0x000D): PCI Abort: clearing. 3w-9xxx: scsi0: ERROR: (0x06:0x001F): Microcontroller not ready during reset sequence. 3w-9xxx: scsi0: ERROR: (0x06:0x0036): Response queue (large) empty failed during reset sequence. 3w-9xxx 0000:09:00.0: PCI INT A disabled

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• Why is uploading to S3 so slow?

  - by Tom Marthenal

  I am using s3cmd to upload to S3: # s3cmd put 1gb.bin s3://my-bucket/1gb.bin 1gb.bin -> s3://my-bucket/1gb.bin [1 of 1] 366706688 of 1073741824 34% in 371s 963.22 kB/s I am uploading from Linode, which has an outgoing bandwidth cap of 50 Mb/s according to support (roughly 6 MB/s). Why am I getting such slow upload speeds to S3, and how can I improve them? Update: Uploading the same file via SCP to an m1.medium EC2 instance (SCP from my Linode to the instance's EBS drive) gives about 44 Mb/s according to iftop (any compression done by the cipher is not a factor). Traceroute: Here's a traceroute to the server it's uploading to (according to tcpdump). # traceroute s3-1-w.amazonaws.com. traceroute to s3-1-w.amazonaws.com. (72.21.194.32), 30 hops max, 60 byte packets 1 207.99.1.13 (207.99.1.13) 0.635 ms 0.743 ms 0.723 ms 2 207.99.53.41 (207.99.53.41) 0.683 ms 0.865 ms 0.915 ms 3 vlan801.tbr1.mmu.nac.net (209.123.10.9) 0.397 ms 0.541 ms 0.527 ms 4 0.e1-1.tbr1.tl9.nac.net (209.123.10.102) 1.400 ms 1.481 ms 1.508 ms 5 0.gi-0-0-0.pr1.tl9.nac.net (209.123.11.62) 1.602 ms 1.677 ms 1.699 ms 6 equinix02-iad2.amazon.com (206.223.115.35) 9.393 ms 8.925 ms 8.900 ms 7 72.21.220.41 (72.21.220.41) 32.610 ms 9.812 ms 9.789 ms 8 72.21.222.141 (72.21.222.141) 9.519 ms 9.439 ms 9.443 ms 9 72.21.218.3 (72.21.218.3) 10.245 ms 10.202 ms 10.154 ms 10 * * * 11 * * * 12 * * * 13 * * * 14 * * * 15 * * * 16 * * * 17 * * * 18 * * * 19 * * * 20 * * * 21 * * * 22 * * * 23 * * * 24 * * * 25 * * * 26 * * * 27 * * * 28 * * * 29 * * * 30 * * * The latency looks reasonable, at least until the server stopped responding to ping requests.

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• graphics-card makes sound-card produce a buzzing sound

  - by Markus von Broady

  Recently I bought a new GPU: GeForce GTX 550 Ti, and after installing it I get a strange buzzing sound. It's not always there, just sometimes (mostly when I open some game, but sometimes also in browsers etc.). It's not a capacitor or a fan, as unplugging speakers from sound-card makes the 'bzzzzzzz' go away. However, muting windows doesn't mute this sound. I'm pretty sure it is fault of the new GPU, but how is this happening and can I fix it? Can it be a low power supply? I thought of buying a stronger unit, but as everything works, and computer doesn't shut down, I hesitate.

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• how to best config for synflood setup in csf but web response still fast

  - by Binh Nguyen

  my server down random every day 4-5 time cause get high load very quick.. I have install csf and with some config server now stable.. load around 5. BUT the big isuse is : the real user very hard to access website specially from IE browser you can test at xaluan.com the flowing is config using in csf: SYNFLOOD = "1" SYNFLOOD_RATE = "100/s" SYNFLOOD_BURST = "10" CONNLIMIT = "80;30" PORTFLOOD = "80;tcp;70;5" CT_LIMIT = "29" # other config may same as default i playing around with this config for a week but still not work around.. If increase the rate SYNFLOOD_RATE = "140/s" or more.. the website response very fast.. be side have bad effect of server load increase so fast normal 20 and may be up to few hundred in peck time .. my need is response time fast but load still low.. please help thanks ps: server runing nginx frontend, apache, mysql, php ,, the home page has around 70 elements which will cached in browser in fist time access..

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• Slab uses 88Gb of 128Gb available. What could cause this?

  - by Joris Meys

  We run a debian 2.6.26-2-amd64 x86_64 GNU/Linux on a server with 128 Gb. Recently it our available memory became rather low. Looking at the /proc/meminfo showed that the Slab was using 88Gb, which is counted in the used memory off course. Is this a problem? I suspect that memory will be freed when necessary, but I don't know if that could have unwanted side effects. Why would Slab need that much memory? Is there a clear cause for that? can we avoid this to happen in the future? How can we free this memory? thank you in advance > cat /proc/meminfo MemTotal: 132304500 kB MemFree: 26669388 kB Buffers: 237504 kB Cached: 11881136 kB SwapCached: 48 kB Active: 5244640 kB Inactive: 11714308 kB SwapTotal: 5751228 kB SwapFree: 5750436 kB Dirty: 24 kB Writeback: 0 kB AnonPages: 4840256 kB Mapped: 163968 kB Slab: 88314840 kB SReclaimable: 88275644 kB SUnreclaim: 39196 kB PageTables: 80852 kB NFS_Unstable: 0 kB Bounce: 0 kB WritebackTmp: 0 kB CommitLimit: 71903476 kB Committed_AS: 6818332 kB VmallocTotal: 34359738367 kB VmallocUsed: 505724 kB VmallocChunk: 34359231963 kB

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• BES Express - configure MDS to push messages from 3rd party web application

  - by Max Gontar

  Hi! I have developed IIS web service to send PAP messages using Blackberry Push API over MDS. And there is an application installed on device, configured to receive push messages on appropriate port. Everything works well on MDS simulator. But it's not working well in real environment: I have installed BES Express and register several devices. I can browse MDS url with appropriate port, so url is correct. Also port enabled for reliable pushes is used in push message and in device application. Here is MDS simulator log: <2011-01-12 14:00:03.456 EET>:[272]:<MDS-CS_MDS>:<DEBUG>:<LAYER = SCM, EVENT = PapServlet: request from 0:0:0:0:0:0:0:1 564 bytes...> <2011-01-12 14:00:03.476 EET>:[273]:<MDS-CS_MDS>:<DEBUG>:<LAYER = SCM, EVENT = Mapping PAP request to push request for pushID:pushID:asdas> <2011-01-12 14:00:03.479 EET>:[274]:<MDS-CS_MDS>:<DEBUG>:<LAYER = SCM, EVENT = PushServlet: POST request from [UNKNOWN @ 0:0:0:0:0:0:0:1] to [PAPDEST=WAPPUSH%3D2100000A%253A100%2FTYPE%3DUSER%40rim.net&PORT=100&REQUESTURI=/] : -1 bytes...> <2011-01-12 14:00:03.480 EET>:[275]:<MDS-CS_MDS>:<DEBUG>:<LAYER = SCM, EVENT = submitting push message with id:pushID:asdas> <2011-01-12 14:00:03.482 EET>:[276]:<MDS-CS_MDS>:<DEBUG>:<LAYER = SCM, EVENT = Executing push submit command for pushID:pushID:asdas> <2011-01-12 14:00:03.483 EET>:[278]:<MDS-CS_MDS>:<DEBUG>:<LAYER = SCM, EVENT = Pushing message to: 2100000a> <2011-01-12 14:00:03.484 EET>:[279]:<MDS-CS_MDS>:<DEBUG>:<LAYER = SCM, EVENT = Number of active push connections:1> <2011-01-12 14:00:03.489 EET>:[280]:<MDS-CS_MDS>:<DEBUG>:<LAYER = SCM, EVENT = added server-initiated connection = -872546301, push id = pushID:asdas> <2011-01-12 14:00:03.491 EET>:[281]:<MDS-CS_MDS>:<DEBUG>:<LAYER = SCM, EVENT = Available threads in DefaultJobPool = 9 running JobRunner: DefaultJobRunner-7> <2011-01-12 14:00:03.494 EET>:[282]:<MDS-CS_MDS>:<DEBUG>:<LAYER = IPPP, HANDLER = HTTP, EVENT = ReceivedFromServer, DEVICEPIN = 2100000a, CONNECTIONID = -872546301, HTTPTRANSMISSION => <2011-01-12 14:00:03.494 EET>:[282]:<MDS-CS_MDS>:<DEBUG>:<LAYER = IPPP, HANDLER = HTTP, EVENT = ReceivedFromServer, DEVICEPIN = 2100000a, CONNECTIONID = -872546301, HTTPTRANSMISSION = [Transmission Line Section]:> <2011-01-12 14:00:03.494 EET>:[282]:<MDS-CS_MDS>:<DEBUG>:<LAYER = IPPP, HANDLER = HTTP, EVENT = ReceivedFromServer, DEVICEPIN = 2100000a, CONNECTIONID = -872546301, HTTPTRANSMISSION = POST / HTTP/1.1> <2011-01-12 14:00:03.494 EET>:[282]:<MDS-CS_MDS>:<DEBUG>:<LAYER = IPPP, HANDLER = HTTP, EVENT = ReceivedFromServer, DEVICEPIN = 2100000a, CONNECTIONID = -872546301, HTTPTRANSMISSION = [Headers Section]: 8 headers> <2011-01-12 14:00:03.494 EET>:[282]:<MDS-CS_MDS>:<DEBUG>:<LAYER = IPPP, HANDLER = HTTP, EVENT = ReceivedFromServer, DEVICEPIN = 2100000a, CONNECTIONID = -872546301, HTTPTRANSMISSION = [Parameters Section]: 3 parameters> <2011-01-12 14:00:03.499 EET>:[283]:<MDS-CS_MDS>:<DEBUG>:<LAYER = IPPP, HANDLER = HTTP, EVENT = SentToDevice, DEVICEPIN = 2100000a, CONNECTIONID = -872546301, HTTPTRANSMISSION => <2011-01-12 14:00:03.499 EET>:[283]:<MDS-CS_MDS>:<DEBUG>:<LAYER = IPPP, HANDLER = HTTP, EVENT = SentToDevice, DEVICEPIN = 2100000a, CONNECTIONID = -872546301, HTTPTRANSMISSION = [Transmission Line Section]:> <2011-01-12 14:00:03.499 EET>:[283]:<MDS-CS_MDS>:<DEBUG>:<LAYER = IPPP, HANDLER = HTTP, EVENT = SentToDevice, DEVICEPIN = 2100000a, CONNECTIONID = -872546301, HTTPTRANSMISSION = POST / HTTP/1.1> <2011-01-12 14:00:03.499 EET>:[283]:<MDS-CS_MDS>:<DEBUG>:<LAYER = IPPP, HANDLER = HTTP, EVENT = SentToDevice, DEVICEPIN = 2100000a, CONNECTIONID = -872546301, HTTPTRANSMISSION = [Headers Section]: 9 headers> <2011-01-12 14:00:03.499 EET>:[283]:<MDS-CS_MDS>:<DEBUG>:<LAYER = IPPP, HANDLER = HTTP, EVENT = SentToDevice, DEVICEPIN = 2100000a, CONNECTIONID = -872546301, HTTPTRANSMISSION = [Parameters Section]: 3 parameters> <2011-01-12 14:00:03.501 EET>:[284]:<MDS-CS_MDS>:<DEBUG>:<LAYER = SCM, EVENT = Finished JobRunner: DefaultJobRunner-7, available threads in DefaultJobPool = 10, time spent = 8ms> <2011-01-12 14:00:03.521 EET>:[287]:<MDS-CS_MDS>:<DEBUG>:<LAYER = IPPP, EVENT = CreatedSendingQueue, DEVICEPIN = 2100000a> <2011-01-12 14:00:03.526 EET>:[290]:<MDS-CS_MDS>:<DEBUG>:<LAYER = IPPP, EVENT = Sending, TAG = 1288699908, DEVICEPIN = 2100000a, VERSION = 16, CONNECTIONID = -872546301, SEQUENCE = 0, TYPE = NOTIFY-REQUEST, CONNECTIONHANDLER = http, PROTOCOL = TCP, PARAMETERS = [MGONTAR/10.10.0.35:100], SIZE = 339> <2011-01-12 14:00:03.531 EET>:[291]:<MDS-CS_MDS>:<DEBUG>:<LAYER = SCM, EVENT = Number of active push connections:0> <2011-01-12 14:00:03.591 EET>:[292]:<MDS-CS_MDS>:<DEBUG>:<LAYER = IPPP, EVENT = Notification, TAG = 1288699908, STATE = DELIVERED> <2011-01-12 14:00:03.600 EET>:[296]:<MDS-CS_MDS>:<DEBUG>:<LAYER = SCM, EVENT = Device connections: AVG latency (msecs)79> <2011-01-12 14:00:03.600 EET>:[297]:<MDS-CS_MDS>:<DEBUG>:<LAYER = IPPP, Removed push connection:-872546301> <2011-01-12 14:00:07.015 EET>:[298]:<MDS-CS_MDS>:<DEBUG>:<LAYER = IPPP, EVENT = RemovedSendingQueue, DEVICEPIN = 2100000a> And here is real MDS log: <2011-01-12 11:35:02.763 GMT>:[3932]:<MDS-CS_LDN-SERVER1_MDS-CS_1>:<DEBUG>:<LAYER = SCM, PapServlet: request from 192.168.1.241 583 bytes...> <2011-01-12 11:35:02.897 GMT>:[3933]:<MDS-CS_LDN-SERVER1_MDS-CS_1>:<DEBUG>:<LAYER = SCM, Mapping PAP request to push request for pushID:pushID:sdfsdfwerwer> <2011-01-12 11:35:02.909 GMT>:[3934]:<MDS-CS_LDN-SERVER1_MDS-CS_1>:<DEBUG>:<LAYER = SCM, PushServlet: POST request from [UNKNOWN @ 192.168.1.241] to [PAPDEST=WAPPUSH%3D22D7F6BD%253A7874%2FTYPE%3DUSER%40rim.net&PORT=7874&REQUESTURI=/]> <2011-01-12 11:35:02.909 GMT>:[3934]:<MDS-CS_LDN-SERVER1_MDS-CS_1>:<DEBUG>:<push id: pushID:sdfsdfwerwer> <2011-01-12 11:35:02.910 GMT>:[3935]:<MDS-CS_LDN-SERVER1_MDS-CS_1>:<DEBUG>:<LAYER = SCM, submitting push message with id:pushID:sdfsdfwerwer> <2011-01-12 11:35:02.910 GMT>:[3936]:<MDS-CS_LDN-SERVER1_MDS-CS_1>:<DEBUG>:<LAYER = SCM, Executing push submit command for pushID:pushID:sdfsdfwerwer> <2011-01-12 11:35:02.911 GMT>:[3937]:<MDS-CS_LDN-SERVER1_MDS-CS_1>:<DEBUG>:<LAYER = SCM, Pushing message to: 22d7f6bd> <2011-01-12 11:35:02.912 GMT>:[3938]:<MDS-CS_LDN-SERVER1_MDS-CS_1>:<DEBUG>:<LAYER = SCM, Number of active push connections:1> <2011-01-12 11:35:02.931 GMT>:[3939]:<MDS-CS_LDN-SERVER1_MDS-CS_1>:<DEBUG>:<LAYER = SCM, added server-initiated connection = -1848311806, push id = pushID:sdfsdfwerwer> <2011-01-12 11:35:03.240 GMT>:[3940]:<MDS-CS_LDN-SERVER1_MDS-CS_1>:<DEBUG>:<LAYER = IPPP, EVENT = CreatedSendingQueue, DEVICEPIN = 22d7f6bd, USERID = u3> <2011-01-12 11:35:03.241 GMT>:[3941]:<MDS-CS_LDN-SERVER1_MDS-CS_1>:<DEBUG>:<LAYER = IPPP, EVENT = Sending, TAG = 536543251, DEVICEPIN = 22d7f6bd, USERID = u3, VERSION = 16, CONNECTIONID = -1848311806, SEQUENCE = 0, TYPE = NOTIFY-REQUEST, CONNECTIONHANDLER = http, PROTOCOL = TCP, PARAMETERS = [LDN-Server1/192.168.1.240:7874], SIZE = 383> <2011-01-12 11:35:03.241 GMT>:[3942]:<MDS-CS_LDN-SERVER1_MDS-CS_1>:<DEBUG>:<LAYER = SCM, Number of active push connections:0> <2011-01-12 11:35:03.253 GMT>:[3943]:<MDS-CS_LDN-SERVER1_MDS-CS_1>:<DEBUG>:<LAYER = SRP, SRPID = S27700165[LDN-SERVER1:3200], EVENT = Sending, VERSION = 1, COMMAND = SEND, TAG = 536543251, SIZE = 570> <2011-01-12 11:35:03.838 GMT>:[3944]:<MDS-CS_LDN-SERVER1_MDS-CS_1>:<DEBUG>:<LAYER = SRP, SRPID = S27700165[LDN-SERVER1:3200], EVENT = Receiving, VERSION = 1, COMMAND = STATUS, TAG = 536543251, SIZE = 10, STATE = DELIVERED> <2011-01-12 11:35:04.104 GMT>:[3945]:<MDS-CS_LDN-SERVER1_MDS-CS_1>:<DEBUG>:<LAYER = IPPP, EVENT = Notification, TAG = 536543251, STATE = DELIVERED> <2011-01-12 11:35:04.121 GMT>:[3946]:<MDS-CS_LDN-SERVER1_MDS-CS_1>:<DEBUG>:<LAYER = SCM, Device connections: AVG latency (msecs)893> <2011-01-12 11:35:04.135 GMT>:[3947]:<MDS-CS_LDN-SERVER1_MDS-CS_1>:<INFO >:<LAYER = IPPP, DEVICEPIN = 22d7f6bd, DOMAINNAME = LDN-Server1/192.168.1.240, CONNECTION_TYPE = PUSH_CONN, ConnectionId = -1848311806, DURATION(ms) = 1151, MFH_KBytes = 0, MTH_KBytes = 0.374, MFH_PACKET_COUNT = 0, MTH_PACKET_COUNT = 1> <2011-01-12 11:35:04.144 GMT>:[3948]:<MDS-CS_LDN-SERVER1_MDS-CS_1>:<DEBUG>:<LAYER = IPPP, Removed push connection:-1848311806> <2011-01-12 11:35:09.264 GMT>:[3949]:<MDS-CS_LDN-SERVER1_MDS-CS_1>:<DEBUG>:<LAYER = IPPP, EVENT = RemovedSendingQueue, DEVICEPIN = 22d7f6bd, USERID = u3> <2011-01-12 11:35:58.187 GMT>:[3950]:<MDS-CS_LDN-SERVER1_MDS-CS_1>:<DEBUG>:<LAYER = SRP, SRPID = S27700165[LDN-SERVER1:3200], EVENT = Sending, VERSION = 1, COMMAND = INFO, SIZE = 46> <2011-01-12 11:35:58.187 GMT>:[3951]:<MDS-CS_LDN-SERVER1_MDS-CS_1>:<DEBUG>:<LAYER = SCM, Sent health to S27700165[LDN-SERVER1:3200] Health=[0x 0000 0007 0000 0000],Mask=[0x 0000 0007 0000 0000],Load=[60]> As you can see, logs not really differs, message is marked as delivered. But my app on device not really gets this message (as it works in mds simulator) Please advice me, what may be wrong? Is there some certificate to install or security settings I should configure to make this push message came to device application? Thank you! same question on bbforums

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• Server Configuration / Important Parameter for 500Req/Second

  - by Sparsh Gupta

  I am configuring a server to be used as nginx server for a very heavy traffic website. It is expected to receive traffic from a large number of IP addresses simultaneously. It is expected to get 500Req/Second with atleast 20Million unique IPs connecting it. One of the problems I noticed in my previos server was related to iptables / ipconntrack. I am not aware of this behaviour and would be glad to know which all parameters of a ubuntu / debian (32/64) bit machine should I tweek to get maximum performance from the server. I can put in a lot of RAM on the server but mission critical task is the response times. We ideally dont want any connection to be hanging / timing out / waiting and want as low as possible overall response times. P.S. We are also looking for a kick ass freelancer system admin who can help us figuring / setting this all up. Reach me incase you have some spare time and interested in working on some very heavy traffic website servers.

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• Postfix SMTP server down on Ubuntu

  - by Paddington

  I have a Plesk server running Postfix on Ubuntu 10.04 and the SMTP service on port 25 is down. When I stop and then start postfix the server comes up only for a minute and goes down again. I have checked the load on the server and it is low as shown: *top - 04:29:33 up 19 days, 3:25, 4 users, load average: 1.47, 1.78, 2.34 Tasks: 936 total, 1 running, 935 sleeping, 0 stopped, 0 zombie Cpu(s): 0.7%us, 0.3%sy, 0.0%ni, 86.6%id, 11.7%wa, 0.6%hi, 0.1%si, 0.0%st Mem: 6110496k total, 6072988k used, 37508k free, 251244k buffers Swap: 12000544k total, 95264k used, 11905280k free, 4370432k cached* IMAP clients are not experiencing a problem and there are no issues with receiving emails for both POP or IMAP. Only SMTP (port 25) is a problem. If I ask clients to use the submission port (587) messages are delivered. netstat -lnt shows the following results , so its not a port issue. tcp 0 0 0.0.0.0:25 0.0.0.0: LISTEN tcp 0 0 0.0.0.0:8443 0.0.0.0:* LISTEN*

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• How to change the fonts used in Foxit Reader?

  - by user982438

  I really want to use Foxit Reader as my default PDF reader for its Tab Interface, and low memory footprint. Having tried mutiple times over the years the only thing that is stopping me are the Fonts. PDF in Adobe Reader looks Regular, but PDF Rendered in Foxit Looks Ugly. Would this solution works in Chrome as well? Since i record Chrome is using Foxit Reader as its embedded PDF engine. And is there any reasons why Fonts are used differently in Adobe and Foxit Reader?

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• page allocation failure - am I running out of memory?

  - by mfriedman

  Lately I've noticing entries like this one in the kern.log of one of my servers: Feb 16 00:24:05 aramis kernel: swapper: page allocation failure. order:0, mode:0x20 This is what I'd like to know: What exactly does that message mean? Is my server running out of memory? The swap usage is quite low (less than 10%), and so far I haven't noticed any processes being killed because of lack of memory. Additional information: The server is a Xen instance (DomU) running Debian 6.0 It has 512 MB of RAM and a 512 MB swap partition CPU load inside the virtual machine shows an average of 0.25

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• Nginx & Passenger - failed (11: Resource temporarily unavailable) while connecting to upstream

  - by Toby Hede

  I have an Nginx and Passenger setup that is proving problematic. At relatively low loads the server seems to get backed up and start churning results like this into the error.log: connect() to unix:/passenger_helper_server failed (11: Resource temporarily unavailable) while connecting to upstream My passenger setup is: passenger_min_instances 2; passenger_pool_idle_time 1200; passenger_max_pool_size 20; I have done some digging, and it looks like the CPU gets pegged. Memory usage seems fine passenger_memory_stats shows at most about 700MB being used, but CPU approaches 100%. is this enough to cause this type of error? Should i bring the pool size down? Are there other configuration settings I should be looking at? Any help appreciated Other pertinent information: Amazon EC2 Small Instance Ubuntu 10.10 Nginx (latest stable) Passenger (latest stable) Rails 3.0.4

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• Is there any reason to subnet a home network?

  - by Will

  For networks I understand we set a netmask on each computer to let it know what IPs it can talk to without going through the router - IPs on the same subnet can talk directly to each other and do not have to go through a router/switch. However, in today's home networks (and I suspect corporate networks as well) every computer is connected to a router/switch (at the low cost of today's hardware I doubt there it much of a market for wired repeaters/hubs). This seems to obviate the need for a subnet mask and subnetting. Considering that in most modern home architectures every computer goes through the router, even to talk to computers on the same network, is there any reason for me to subnet a home network?

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