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• ipv6 : why ndp resolves to global scope address?

  - by Julien

  I'm facing a strange ipv6 behavior and I don't know how to solve it because I'm not familiar with ipv6. Maybe this behavior is normal. I hope that you will help me. ( I'm running under debian 6.0.9 with a custom kernel 3.2.58 ) machine A is "2a00:7d30:edf6:100::1" wants to ping machine B, which is "2a00:7d30:edf6:100::10". Both are on the same segment. machine A asks for the address of machine B and I don't understand why machine B gives its global scope address instead of the local scope one ? 10:59:02.082785 IP6 2a00:7d30:edf6:100::1 ff02::1:ff00:10: ICMP6, neighbor solicitation, who has 2a00:7d30:edf6:100::10, length 32 10:59:02.082821 IP6 2a00:7d30:edf6:100::10 2a00:7d30:edf6:100::1: ICMP6, neighbor advertisement, tgt is 2a00:7d30:edf6:100::10, length 32 after that machine A pings the global scope address of machine B and it works fine : 10:59:02.082927 IP6 2a00:7d30:edf6:100::1 2a00:7d30:edf6:100::10: ICMP6, echo request, seq 1, length 64 10:59:02.082960 IP6 2a00:7d30:edf6:100::10 2a00:7d30:edf6:100::1: ICMP6, echo reply, seq 1, length 64 Thank you for you help best regards Julien

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• Why is this APC installation failing so badly?

  - by Matt

  I have multiple instances of APC running on my server with similar configurations (albeit with different cache sizes. However, one of the instances is performing extremely poorly, and I have no idea why (100% cache fragmentation, high miss rate). The runtime settings I'm using are as follows (pretty much out of the box): apc.cache_by_default 1 apc.canonicalize 1 apc.coredump_unmap 0 apc.enable_cli 0 apc.enabled 1 apc.file_md5 0 apc.file_update_protection 2 apc.filters apc.gc_ttl 3600 apc.include_once_override 0 apc.lazy_classes 0 apc.lazy_functions 0 apc.max_file_size 1M apc.mmap_file_mask apc.num_files_hint 1000 apc.preload_path apc.report_autofilter 0 apc.rfc1867 0 apc.rfc1867_freq 0 apc.rfc1867_name APC_UPLOAD_PROGRESS apc.rfc1867_prefix upload_ apc.rfc1867_ttl 3600 apc.shm_segments 1 apc.shm_size 10M apc.slam_defense 1 apc.stat 1 apc.stat_ctime 0 apc.ttl 0 apc.use_request_time 1 apc.user_entries_hint 4096 apc.user_ttl 0 apc.write_lock 1 APC is version 3.1.6, PHP is 5.3.3-1ubuntu9.5. I've tried restarting Apache multiple times, so this isn't a freak instance. The instance with problems is simply running Wordpress with a few plugins installed. All other instances (~4) on the server are running perfectly fine with almost 100% hit rates and 0% fragmentation; for example this instance is holding a website built using the Symfony framework. Any help would be much appreciated; I haven't had much experience with APC and was hoping for it to be an out-of-the-box speed boost ;).

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• Why does this batch script terminate unexpectedly?

  - by neurolysis

  This batch script terminates when %CHECKCONTINUE% is given a null value by not inputting anything on line 13 (SET /p CHECKCONTINUE=Okay to continue? (y/n):), why is this? @ECHO OFF SETLOCAL TITLE Registry restore script REM Restores registry settings and disables the cloud SET %CHECKCONTINUE%= :listaction ECHO I'm about to... ECHO 1.) Remove the registry data that specifies settings for TF2 ECHO 2.) Forcibly disable Steam Cloud. ECHO. SET /p CHECKCONTINUE=Okay to continue? (y/n): REM No? IF %CHECKCONTINUE%==n GOTO exit IF %CHECKCONTINUE%==no GOTO exit REM Yes? IF %CHECKCONTINUE%==y GOTO start IF %CHECKCONTINUE%==yes GOTO start REM Did they put something else? IF DEFINED %CHECKCONTINUE% GOTO loop-notvalid REM Did they not put anything at all? IF NOT DEFINED %CHECKCONTINUE% GOTO loop-noreply :start REM Delete application specific data REG DELETE HKEY_CURRENT_USER\Software\Valve\Source\tf\Settings /f REG DELETE HKEY_CURRENT_USER\Software\Valve\Steam\Apps\440 /f REM Disable Steam Cloud for TF2 REG ADD HKEY_CURRENT_USER\Software\Valve\Steam\Apps\440 /v Cloud /t REG_DWORD /d "0x0" /f :exit ENDLOCAL EXIT :loop-notvalid ECHO. ECHO That's not a valid reply. Try again. ECHO. SET %CHECKCONTINUE%= GOTO listaction :loop-noreply ECHO. ECHO You must enter a reply. ECHO. SET %CHECKCONTINUE%= GOTO listaction

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• Installation of Active Directory on separate VM from DNS does not entierly work - not sure why

  - by René Kåbis

  Not sure what I am doing wrong here. I have a moderately midrange server (16 cores, 2Ghz, 32GB ECC REG RAM, 6TB storage, nothing too extreme) where I am running Hyper-V (Server 2012 R2 Enterprise) in order to provision virtual machines. So why an AD separate from DNS? I want redundancy. I want to be able to move VMs and back them up individually and not have too many services on any one VM. I have already provisioned a VM with DNS, and have set it up right -- essentially, I have: Set up Static IP’s for everyone involved. Installed the DNS service on the DNS VM. Created a forward lookup zone and a reverse lookup zone (primary zone) xyz.ca Configured the zones to use nonsecure and secure dynamic updates (i will change this to secure later after the domain controller is online). Created a A record for the DC in the forward lookup zone (and a reverse ptr) Changed DC’s DNS server (network settings) to the new DNS server. Checked that I can ping the dns server from the new DC by hostname. When I went ahead and did a DCpromo on the DC, and un-cheked the “install DNS” option, everything seemed to go well (no error messages), but I saw no changes on the DNS server whatsoever (no additional settings). Plus, the DNS server seems to be unable to join the domain, as it claims that the domain is not discoverable. As a final note, I do run Symantec Endpoint Protection, which includes a firewall and most settings set as default. I have not yet tried turning this off, but my experience has been that if a service would open up a port on a Windows firewall, it would do the same through Symantec. There is pretty tight integration these days with corporate-class AV and Windows. I have a template vhdx fully set up (just short of any special roles and features) that I can use to replace the current AD VM with, so doing this all over again is not too much skin off of my nose.

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• Why should one have a secondary DNS server?

  - by Sam Levin

  I'm very confused. I basically understand how DNS works. Here's an example that helps illustrate what I'm having trouble understanding. Right now, I run a small web-server. I use my provider's DNS manager, so I don't have a DNS server hosted on the machine. Let's say for a second, that I don't use my host's DNS, and I decide to set up a DNS server on my server. Hypothetical scenario: my server (entire) server goes down - DNS included. Why do I need backup DNS? If the server is down, who cares if the DNS server is down too, considering that even if I had DNS up (it wasn't on the crashed server), it wouldn't be able to forward requests anyway since the server would be down? Is the point of having secondary DNS, to be able to change the IP addresses that your DNS server points to, so if your webserver was down, you could redirect traffic to a backup? How would you switch to the secondary provider, in the event that your main DNS provider becomes unavailable? Is a backup DNS system basically up all the time? How is it configured? Is it just an exact clone of the DNS server you would have on your server? Do they run simultaneously? Hopefully someone can see what I'm hung up on, and provide some guidance. Thanks

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• Removing forward lookup zone broke our site - why?

  - by user102469

  I'm fairly new to the job and trying to get to grips with the infrastructure here. We've moved a site from being locally hosted on our own network to an external host (1&1). I've transferred the DNS hosting from the previous DNS host to 1&1 to keep things simple. Once everything had gone through, visitors that were external to our network were being directed to the new site on 1&1 but requests from within our network were still going to our own server. I noticed in the DNS server that there was a forward lookup zone for the site pointing to our own server still. My (admittedly simplistic) understanding was that pausing that zone would then cause the DNS server to get the address for the site from our external DNS servers and our users would start landing on our new site. However, what happened instead was that they were being met with "page not found" type errors. I've resolved it my modifying the forward lookup zone A record to point to the external web server but would like to get an understanding as to why pausing the zone didn't work. Would deleting the zone work? I am reluctant to try that as creating it again will not be as easy as simply pressing "start". Many thanks.

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• Why does this preseed for gitolite fail?

  - by troutwine

  I'm installing gitolite on a Debian Squeeze box with the following preseed: gitolite gitolite/gituser string git gitolite gitolite/adminkey string ssh-rsa AAAAB3ECT gitolite gitolite/gitdir string /var/lib/git On installation: # debconf-set-selections /var/cache/debconf/gitolite.preseed # apt-get install gitolite Reading package lists... Done Building dependency tree Reading state information... Done Suggested packages: git-daemon-run gitweb The following NEW packages will be installed: gitolite 0 upgraded, 1 newly installed, 0 to remove and 26 not upgraded. Need to get 0 B/114 kB of archives. After this operation, 348 kB of additional disk space will be used. Preconfiguring packages ... Selecting previously deselected package gitolite. (Reading database ... 24715 files and directories currently installed.) Unpacking gitolite (from .../gitolite_1.5.4-2+squeeze1_all.deb) ... Setting up gitolite (1.5.4-2+squeeze1) ... adduser: The home dir must be an absolute path. dpkg: error processing gitolite (--configure): subprocess installed post-installation script returned error exit status 1 configured to not write apport reports Errors were encountered while processing: gitolite E: Sub-process /usr/bin/dpkg returned an error code (1) Why? The pre-seed was extracted from a manually configured installation, per here and exists without issue on another machine.

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• Why my internal hard disk can be ejected?

  - by Bear Bear

  I have 6 hard disks in my computer and one DVD. The disk that I connect to the 6th SATA port is a regular disk. But my Windows 7 64 bit shows it as a removable drive. I can eject my hard disk! Just like a pen drive. If I connect another disk to the 6th port, I can eject that disk too. So it has nothing to do with the physical disk, it must be something related to Windows or BIOS I don't understand why Windows 7 is seeing a normal hard disk as removable. In Computer Management - Disk Management, the disk looks identical to the others - there is nothing there to suggest the drive is different from the others. But in the tray I have the icon to eject it. The motherboard model is ASUS F2A85 V PRO FM2. All the disks are formatted normally, no Dynamic Disk, no RAID, nothing special. How can I tell Windows 7 to treat the disk exactly like the others, so it can't be ejected?

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• Why Is Volume Shadow Copy Services stopping?

  - by David Mackintosh

  I am running Windows 7 Professional, 64-bit. I am running a backup-over-the-internet software client which depends on the Volume Shadow Copy Services running. Since I installed Service Pack 1 (or rather, didn't object when Windows Update forced Service Pack 1 on me) the backup service is failing to back everything up because VSC isn't running. Most of the time it fails to back up such noise as the Security Essentials database or the Messenger Live contact list -- stuff I really don't care about -- but I don't want to fall into the trap of accepting an Error-state backup as "normal". At the recommendation of the backup software, I have set the VSC service startup mode to be Automatic. When I look in the Event Log, System channel I can see at boot time: The Volume Shadow Copy service entered the running state. ...and then two or three minutes later: The Volume Shadow Copy service entered the stopped state. How do I figure out why VSC is stopping? At the suggestion of the backup vendor, I have already followed the suggestions from http://support.microsoft.com/default.aspx/kb/940184 net stop SENS net stop EventSystem net start EventSystem net start SENS net stop COMSysApp net stop SwPrv net stop VSS cd /d C:\Windows\system32 regsvr32 ole32.dll /s regsvr32 oleaut32.dll /s regsvr32 vss_ps.dll /s vssvc /register /s regsvr32 /i swprv.dll /s regsvr32 /i eventcls.dll /s regsvr32 es.dll /s regsvr32 stdprov.dll /s regsvr32 vssui.dll /s regsvr32 msxml.dll /s regsvr32 msxml3.dll /s regsvr32 msxml4.dll /s net start SwPrv net start VSS net start ProtectedStorage ...and per http://support.microsoft.com/kb/940184 I have deleted the key tree HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\EventSystem\{26c409cc-ae86-11d1-b616-00805fc79216}\Subscriptions I have also run chkdsk /F and chkdsk /R on both permanent hard disks. (I had a similar problem with another computer (same OS, same failure, same start point after SP1 install) but the problem went away when I forced Volume Shadow Copy Services to Automatic startup rather than Manual. I did not have to resort to following the Microsoft KB instructions.)

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• Why does this loopback device creation malfunction?

  - by user50118

  The stackoverflow people thought this was more appropriate here, I put it there as it is part of a program but I can see their POV, so here it is: At the bottom of the code you can see it failing. In fact, I'll put it here at the start too because it is the problem I need to solve: [350591.924819] EXT4-fs (loop0): bad geometry: block count 9750806 exceeds size of device (9750168 blocks) I don't understand why the device is supposedly too small. I made this partition two days ago with normal fdisk, it was created and formatted with ext4 supplying no options other than the partition (/dev/sdb2) to format. The only explaination I can think of is that ext4 has the size of the partition wrong somehow but that seems very unlikely. What is wrong with my math? The offset is correct, you can see that with the file command, and the size should be correct too because End - Start comes to the same number of sectors minus 1, just like it should (A disk starting on sector 1 and ending on sector 2 would be 2 - 1 = 1 and have two sectors). # sfdisk -luS /dev/sdb Disk /dev/sdb: 9729 cylinders, 255 heads, 63 sectors/track Units = sectors of 512 bytes, counting from 0 Device Boot Start End #sectors Id System /dev/sdb2 78295040 156296384 78001345 83 Linux # losetup -r -f --show -o $((78295040 * 512)) --sizelimit $((78001345 * 512)) /dev/sdb /dev/loop0 # file -s /dev/loop0 /dev/loop0: Linux rev 1.0 ext4 filesystem data (needs journal recovery) (extents) (large files) (huge files) # mount -o ro -t ext4 /dev/loop0 /mnt mount: wrong fs type, bad option, bad superblock on /dev/loop0, missing codepage or helper program, or other error In some cases useful info is found in syslog - try dmesg | tail or so # dmesg | tail -n 1 [350591.924819] EXT4-fs (loop0): bad geometry: block count 9750806 exceeds size of device (9750168 blocks)

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• why does my computer crash?

  - by chobo2

  Hi my computer keeps crashing and I don't know why. At first I thought because I had my cpu over clocked that it all of sudden was crashing. So I set my cpu back to regular speed. This did not help. I then thought it was because 2 sticks of my memory where from a computer that suffered from a power surge. However I just ran the windows memory diagnostic tool( extended) and after like 6 hours of testing my memory it found no errors. So now the only thing that is left is windows 7 64bit. I first over clocked my cpu for a couple months while running XP. Never had a problem. I installed the memory and windows 7 at the same time. But I not sure if it is my memory now since it passed the diagnostic tests. However I am not sure if it is windows 7 either has I installed it twice in the last year. I really don't want to go back to XP to find out if this is the case. So here are my blue screens of deaths(from bluescreen). https://sites.google.com/site/myerrorswin7/errors (I hope you enjoy my great site lol) As you can see most of them are different NTFS_FILE_SYSTEM KMODE_EXCEPTION_NOT_HANDLED BAD_POOL_HEADER IRQL_NOT_LESS_OR_EQUAL SYSTEM_THREAD_EXCEPTION_NOT_HANDLED SYSTEM_SERVICE_EXCEPTION

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• Why do you use a 3PAR SAN? [closed]

  - by Starfish

  If you use a 3PAR SAN, I’d like to hear what you think about it, particularly compared to the HP EVA. What do you see as its advantages over other SANs like the EVA? What’s so special about the ASIC? We had HP quote us an EVA P6500 and 3PAR V400 with equivalent storage and the 3PAR was nearly twice the cost. My site has two EVA SANs with a combined capacity of ~80 TB. We want to replace the older and larger of the two. We’ve been looking at the EVA and the 3PAR to see which would be a better fit for us. I’m struggling to understand how the 3PAR differs from the EVA from a practical technical standpoint. When I read the sales literature and speak with the HP sales engineers, they spend a lot of time talking about how the 3PAR is better because of its ASIC. It’s ASIC this and ASIC that, but when I press them on how a 3PAR with thin provisioning is better than an EVA with thin provisioning, I can’t get a straight answer. Meanwhile, one of my colleagues, who has more say regarding which SAN we get, is enamored by the 3PAR, and he can’t explain clearly to me why he wants it over the EVA. Our needs are pretty simple. We have 10 servers running VMware and ~100 VMs. We use VMware’s thin provisioning currently, but we would like to start using thin provisioning on the new SAN. We don’t have a need for SSDs or migration between storage tiers. We plan on having FC or SAS drives for our most used data and SATA/FATA drives for the lesser used data which is how we have the EVAs configured. We also do not need any SAN-level snapshotting or replication.

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• Why the VPN Network Shake-Up?

  - by Brent Arias

  I can RDP to another machine on my home network, only if I'm not also hooked up to my employer's VPN with the Cisco VPN client. Indeed, I can't even ping the other machine by name in this mode, because ICMP suddenly thinks that ( ping myMachine ) now means ( ping myMachine.myEmployer.com ). Of course there is no machine by that latter name, and so it fails. Even weirder, once I disconnect from the VPN I can again ping myMachine successfully, but ICMP reports the machine by its MAC address instead of its IP address. I don't think I've ever seen ping identify another machine by its MAC address. So two questions: How can I access via RDP/ping the other machine BY NAME on my local network while also connected to the VPN? Why is ping identifying a MAC address for the machine on my home network, instead of an IP address? And how can I change this so that an IP address is reported instead? For question #1, I can indeed access the other machine on my home network by IP address. I suspect if I put the name-IP pair into my HOSTS file, then I would be able to access it even when connected to the VPN. But I wonder if there is another (more elegant) solution?

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• Why Wireshark does not recognize this HTTP response?

  - by Alois Mahdal

  I have a trivial CGI script that outputs simple text content. It's written in Perl and using CGI module and it specifies only the most basic headers: print $q->header( -type => 'text/plain', -Content_length => $length, ); print $stuff; There's no apparent issue with functionality, but I'm confused about the fact that Wireshark does not recognize the HTTP response as HTTP--it's marked as TCP. Here is request and response: GET /cgi-bin/memfile/memfile.pl?mbytes=1 HTTP/1.1 Host: 10.6.130.38 User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:11.0) Gecko/20100101 Firefox/11.0 Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8 Accept-Language: cs,en-us;q=0.7,en;q=0.3 Accept-Encoding: gzip, deflate Connection: keep-alive HTTP/1.1 200 OK Date: Thu, 05 Apr 2012 18:52:23 GMT Server: Apache/2.2.15 (Win32) mod_ssl/2.2.15 OpenSSL/0.9.8m Content-length: 1048616 Keep-Alive: timeout=5, max=100 Connection: Keep-Alive Content-Type: text/plain; charset=ISO-8859-1 XXXXXXXX... And here is the packet overview (Full packet is here on pastebin) No. Time Source srcp Destination dstp Protocol Info tcp.stream abstime 5 0.112749 10.6.130.38 80 10.6.130.53 48072 TCP [TCP segment of a reassembled PDU] 0 20:52:23.228063 Frame 5: 1514 bytes on wire (12112 bits), 1514 bytes captured (12112 bits) Ethernet II, Src: Dell_97:29:ac (00:1e:4f:97:29:ac), Dst: Dell_3b:fe:70 (00:24:e8:3b:fe:70) Internet Protocol Version 4, Src: 10.6.130.38 (10.6.130.38), Dst: 10.6.130.53 (10.6.130.53) Transmission Control Protocol, Src Port: http (80), Dst Port: 48072 (48072), Seq: 1, Ack: 330, Len: 1460 Now when I see this in Wireshark: there's usual TCP handshake then the GET request shown as HTTP with preview then the next packet contains the response, but is not marked as an HTTP response--just a generic "[TCP segment of a reassembled PDU]", and is not caught by "http.response" filter. Can somebody explain why Wireshark does not recognize it? Is there something wrong with the response?

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• Why is MySQL table_cache full but never used

  - by Jeremy Clarke

  I have been using the tuning-primer.sh script to tune my my.cnf settings. I have most things working well but the part about TABLE CACHE makes no sense: TABLE CACHE Current table_cache value = 900 tables. You have a total of 0 tables You have 900 open tables. Current table_cache hit rate is 1% , while 100% of your table cache is in use. You should probably increase your table_cache When I do SHOW STATUS; I get the following table-related numbers: Open_tables = 900 Opened_tables = 0 It seems like something is going wrong. I have some extra memory I could use on increasing the table_cache size, but my sense is that the 900 tables already available aren't doing anything, and increasing it will just waste more energy. Why might this be happening? Are there other settings that could cause all my table_cache slots to be used even though there are no hits to them? I have 150 max connections and probably no more than 4 tables per join, FWIW. Here is the tuner script output for temp tables, which I've also been tuning: TEMP TABLES Current max_heap_table_size = 90 M Current tmp_table_size = 90 M Of 11032358 temp tables, 40% were created on disk Perhaps you should increase your tmp_table_size and/or max_heap_table_size to reduce the number of disk-based temporary tables. Note! BLOB and TEXT columns are not allow in memory tables. If you are using these columns raising these values might not impact your ratio of on disk temp tables.

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• why does the partition start on sector 2048 instead of 63

  - by gcb

  I had two drives partitioned the same and running 2 raid partitions on each. One died and I replaced it under warranty for the same model. While trying to partition it, the first partition can only start on sector 2048, instead of 63 that was before. Driver have different geometry as previous and remaining ones. (Fewer heads/more cylinders) old drive: $ sudo fdisk -c -u -l /dev/sdb Disk /dev/sdb: 2000.4 GB, 2000398934016 bytes 255 heads, 63 sectors/track, 243201 cylinders, total 3907029168 sectors Units = sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk identifier: 0x000aa189 Device Boot Start End Blocks Id System /dev/sdb1 * 63 174080339 87040138+ 83 Linux /dev/sdb2 174080340 182482334 4200997+ 82 Linux swap / Solaris /dev/sdb3 182482335 3907024064 1862270865 fd Linux raid autodetect remanufactured drive received from warranty: $ sudo fdisk -c -u -l /dev/sda Disk /dev/sda: 2000.4 GB, 2000398934016 bytes 81 heads, 63 sectors/track, 765633 cylinders, total 3907029168 sectors Units = sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk identifier: 0x000d0b5d Device Boot Start End Blocks Id System /dev/sda1 2048 ... why is that?

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• Why would e-mail from our own domain not be forwarded to gmail

  - by netboffin

  To solve a problem with spam on our server we tried to forward e-mail from our dedicated server's mailserver(matrix smtp service) to gmail, but while most e-mails got through e-mail from our own domain all went missing. They weren't in the inbox or spam or anywhere else. We've had to go back to using the old system, which means my boss gets a huge amount of spam. We have a windows 2003 server with iis 6 and the matrix smtp service installed. I've toyed with the idea of installing a mail proxy like ASSP but it looks pretty complicated. We're hosting 20 domains on the server as well as our own which has an online shop whose payment system depends on email. I can't start playing around with complicated solutions when it could have disastrous consequences and I don't know enough to implement them safely. So my question has two parts: Part One: Why can't we forward e-mails from people using the same domain. If our domain was foobar.com then [email protected] can't receive from [email protected], but he can receive from everyone else. Part Two: Is there a really simple server side solution to spam that would work with matrix? For instance popfile?

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• lighttpd: why using port >= 9000 does not work properly

  - by yejinxin

  I had a lighttpd server which works normally. I can access this website from outside(non-localhost) via http://vm.aaa.com:8080. Let's just assume that it's a simple static website, without php or mysql. Now I want to copy this website as a test one(using another port) in the same machine. And I do not want to use virtual host. So I just copy the whole files of original server, including lighttpd's bin/ conf/ htdocs/ lib/ and so on folders. And I made some required change, including changing lighttpd.conf. Now what I'm confused is, if change the port to a number that is less than 9000, it works perfectly. But if the port is changed to a number that is equal or greater than 9000, lighttpd can start, but I can not access the new website from outside, while I do can access the new website from INSIDE(I mean in the same LAN or localhost). The access log from INSIDE is like below: vm.aaa.com:9876 10.46.175.117 - - [08/Oct/2012:13:18:47 +0800] "GET / HTTP/1.1" 200 15 "-" " curl/7.12.1 (x86_64-redhat-linux-gnu) libcurl/7.12.1 OpenSSL/0.9.7a zlib/1.2.1.2 libidn/0.5.6" Command I used to start lighttpd is: bin/lighttpd -f conf/lighttpd.conf -m lib/ -D My lighttpd.conf is like: server.modules = ( "mod_access", "mod_accesslog", ) var.rundir = "/home/work/lighttpd_9876" server.port = 9876 server.bind = "0.0.0.0" server.pid-file = var.rundir + "/log/lighttpd.pid" server.document-root = var.rundir + "/htdocs/" var.cronolog_path = "/home/work/lighttpd_9876/cronolog/sbin/cronolog" server.errorlog = ... accesslog.filename = ... ... So why is this happening? I've tried several diffrent ports, still the same. Isn't that ports between 8000 and 65535 are the same?

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• Why not block ICMP?

  - by Agvorth

  I think I almost have my iptables setup complete on my CentOS 5.3 system. Here is my script... # Establish a clean slate iptables -P INPUT ACCEPT iptables -P FORWARD ACCEPT iptables -P OUTPUT ACCEPT iptables -F # Flush all rules iptables -X # Delete all chains # Disable routing. Drop packets if they reach the end of the chain. iptables -P FORWARD DROP # Drop all packets with a bad state iptables -A INPUT -m state --state INVALID -j DROP # Accept any packets that have something to do with ones we've sent on outbound iptables -A INPUT -m state --state RELATED,ESTABLISHED -j ACCEPT # Accept any packets coming or going on localhost (this can be very important) iptables -A INPUT -i lo -j ACCEPT # Accept ICMP iptables -A INPUT -p icmp -j ACCEPT # Allow ssh iptables -A INPUT -p tcp --dport 22 -j ACCEPT # Allow httpd iptables -A INPUT -p tcp --dport 80 -j ACCEPT # Allow SSL iptables -A INPUT -p tcp --dport 443 -j ACCEPT # Block all other traffic iptables -A INPUT -j DROP For context, this machine is a Virtual Private Server Web app host. In a previous question, Lee B said that I should "lock down ICMP a bit more." Why not just block it altogether? What would happen if I did that (what bad thing would happen)? If I need to not block ICMP, how could I go about locking it down more?

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• Why isn't Apache Basic authentication working?

  - by Brad

  I just upgraded Apache from it's 2003 build, to a squeaky-clean, brand-new 2.4.1 build. All seems pretty good except for one glaring thing: In my httpd.conf file I have the following: <Directory /> AllowOverride none Options FollowSymLinks AuthType Basic AuthName "Enter Password" AuthUserFile /var/www/.htpasswd Require valid-user </Directory> This should allow only users in the specified auth file to access the server - just as it had under the older version of Apache. (Right?) However, it's not working. Requests are granted with no authentication provided. When I switch logging to LogLevel Debug, for the accesses, it says: [Sat Mar 24 21:32:00.585139 2012] [authz_core:debug] [pid 10733:tid 32771] mod_authz_core.c(783): [client 192.168.1.181:57677] AH01626: authorization result of Require all granted: granted [Sat Mar 24 21:32:00.585446 2012] [authz_core:debug] [pid 10733:tid 32771] mod_authz_core.c(783): [client 192.168.1.181:57677] AH01626: authorization result of <RequireAny>: granted I really don't know what this means - and I (to the best of my knowledge) don't have any "Require all granted" or "" statements in any of my files. Any ideas why this isn't working, or where to debug??

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• Why am I experiencing random connection timeouts? (CentOS)

  - by Ryan

  I have a CentOS server setup that currently hosts several websites (all relative of each other in some form or another). As of recently throughout the day at the most random times the website speed will lag to a crawl and eventually hit a connection timeout. When I say random times this typically happens anywhere between 10am and 1pm usually, however, this morning this happened to me at 8am. I do not have a lot of familiarity with server knowledge as far as what I am looking for in this situation. What are some possible causes of why my server is slowing the websites down to a complete crawl or timing out? Are there specific things I should be checking for when this happens? I have noticed using: tail /var/log/httpd/access_log That usually when this down time occurs there are lot of IP addresses related to BingBot, Googlebot, and sometimes various bots or spiders that I am unfamiliar with. Could this be related and if so how can I avoid this from causing my websites to lag out? Thanks in advance for any help or advice. The websites that are timing out are built with PHP and use a MySQL database to display information.

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• How can I tell why I have access to a file share on Windows Server

  - by Joel

  I have a file share on a Windows 2008 R2 server in a AD domain (call it \SECURESERVER\STUFF) and I am not sure if I have the share and folder permissions set up right. I noticed the problem when I set up new server (WORKGROUP\FOREIGNSERVER) that was not joined to the domain and tried to copy some files off of \SECURESERVER\STUFF. I was surprised to find that when I tried to access the files, it did not prompt me for a username and password and proceeded to give me full access to the files. That worried me so I tried the same thing on some workstations that were not in the domain and they did NOT have the same behavior (they did prompt for a username/password as desired/expected). So, I think there is something peculiar about FOREIGNSERVER. I am logging into it with a local admin account, but my domain and SECURESERVER should know nothing of this server. I've carefully gone through the share and folder permissions on the share but I can't find the reason that FOREIGNSERVER has access. How can I find out why FOREIGNSERVER has access to SECURESERVER?

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• Why still use JPG compression? [closed]

  - by Torben Gundtofte-Bruun

  Back when the JPG image format was introduced, it made a lot of sense to reduce the file size, even accepting a loss in image quality, because files were being downloaded over a slow and expensive modem connection. In today's world, file size is no longer a concern, at least not regarding JPG where it seems silly to save 45kB on a photo. But my image editing apps still prompt me for the desired compression level when I save a file. Does it still make sense to go with the default 85? Why should I not crank it up to 100 for all files? Update based on comments: For web work, I might use PNG instead. But every smartphone and camera produces JPG files. The question arises when I save these edits. Audience is my own harddisk. We're talking photos, 2-5MB apiece. Chroma, subsampling, DCT - sorry, never heard of it. I'm a home user, not Photoshop guru. For the record, I use Paint Shop Pro on Win, and Gimp on Linux.

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• why i failed to build vsftp?

  - by hugemeow

  make, then failed with the following message. the main point is /lib/libcap.so.1: could not read symbols: File in wrong format, confusing... gcc -c readwrite.c -O2 -Wall -W -Wshadow -idirafter dummyinc gcc -c opts.c -O2 -Wall -W -Wshadow -idirafter dummyinc gcc -c ssl.c -O2 -Wall -W -Wshadow -idirafter dummyinc gcc -c sslslave.c -O2 -Wall -W -Wshadow -idirafter dummyinc gcc -c ptracesandbox.c -O2 -Wall -W -Wshadow -idirafter dummyinc gcc -c ftppolicy.c -O2 -Wall -W -Wshadow -idirafter dummyinc gcc -c sysutil.c -O2 -Wall -W -Wshadow -idirafter dummyinc gcc -c sysdeputil.c -O2 -Wall -W -Wshadow -idirafter dummyinc gcc -o vsftpd main.o utility.o prelogin.o ftpcmdio.o postlogin.o privsock.o tunables.o ftpdataio.o secbuf.o ls.o postprivparent.o logging.o str.o netstr.o sysstr.o strlist.o banner.o filestr.o parseconf.o secutil.o ascii.o oneprocess.o twoprocess.o privops.o standalone.o hash.o tcpwrap.o ipaddrparse.o access.o features.o readwrite.o opts.o ssl.o sslslave.o ptracesandbox.o ftppolicy.o sysutil.o sysdeputil.o -Wl,-s `./vsf_findlibs.sh` /lib/libcap.so.1: could not read symbols: File in wrong format collect2: ld returned 1 exit status make: *** [vsftpd] Error 1 [mirror@hugemeow vsftpd]$ ls /lib/libc libc-2.5.so libcap.so.1.10 libcidn.so.1 libcom_err.so.2.1 libcrypto.so.0.9.8e libcrypt.so.1 libcap.so.1 libcidn-2.5.so libcom_err.so.2 libcrypt-2.5.so libcrypto.so.6 libc.so.6 [mirror@hugemeow vsftpd]$ ls /lib/libc libc-2.5.so libcap.so.1.10 libcidn.so.1 libcom_err.so.2.1 libcrypto.so.0.9.8e libcrypt.so.1 libcap.so.1 libcidn-2.5.so libcom_err.so.2 libcrypt-2.5.so libcrypto.so.6 libc.so.6 [mirror@hugemeow vsftpd]$ ls /lib/libcap.so.1 -l lrwxrwxrwx 1 root root 14 Mar 20 2012 /lib/libcap.so.1 -> libcap.so.1.10 [mirror@hugemeow vsftpd]$ ls /lib/libcap.so.1 -lh lrwxrwxrwx 1 root root 14 Mar 20 2012 /lib/libcap.so.1 -> libcap.so.1.10 [mirror@hugemeow vsftpd]$ ls /lib/libcap.so.1 -lhL -rwxr-xr-x 1 root root 12K Mar 15 2007 /lib/libcap.so.1 this may have something to do with 64 bit system, but i have make modification to vsf_findlibs.sh 48 # Look for libcap (capabilities) 49 if locate_library /lib64/libcap.so.1; then 50 echo "/lib/libcap.so.1"; 51 elif locate_library /lib64/libcap.so.2; then 52 echo "/lib/libcap.so.2"; 53 else 54 # locate_library /usr/lib/libcap.so && echo "-lcap"; 55 # locate_library /lib/libcap.so && echo "-lcap"; 56 locate_library /lib64/libcap.so.1 && echo "-lcap"; 57 fi but make failed with the same error, why?

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• why i failed to build rtorrent?

  - by hugemeow

  i am not root, so i have to build rtorrent from source and hope to install it in my home directory, but failed, why? [mirror@hugemeow rtorrent]$ ls AUTHORS autogen.sh ChangeLog configure.ac COPYING doc INSTALL Makefile.am NEWS rak README scripts src test [mirror@hugemeow rtorrent]$ ./autogen.sh aclocal... aclocal:configure.ac:7: warning: macro `AM_PATH_CPPUNIT' not found in library autoheader... libtoolize... using libtoolize automake... configure.ac: installing `./install-sh' configure.ac: installing `./missing' src/Makefile.am: installing `./depcomp' autoconf... configure.ac:7: error: possibly undefined macro: AM_PATH_CPPUNIT If this token and others are legitimate, please use m4_pattern_allow. See the Autoconf documentation. though autoge failed, configure script is created. [mirror@hugemeow rtorrent]$ ls aclocal.m4 autogen.sh ChangeLog config.h.in configure COPYING doc install-sh Makefile.am missing rak scripts test AUTHORS autom4te.cache config.guess config.sub configure.ac depcomp INSTALL ltmain.sh Makefile.in NEWS README src run configure, and fail for syntax error near unexpected token `1.9.6', what's wrong? what i should do in order to build this rtorrent for my centos? [mirror@hugemeow rtorrent]$ ./configure checking for a BSD-compatible install... /usr/bin/install -c checking whether build environment is sane... yes checking for gawk... gawk checking whether make sets $(MAKE)... yes ./configure: line 2016: syntax error near unexpected token `1.9.6' ./configure: line 2016: `AM_PATH_CPPUNIT(1.9.6)' [mirror@hugemeow rtorrent]$ git branch * master [mirror@hugemeow rtorrent]$ git branch -a * master remotes/origin/HEAD -> origin/master remotes/origin/c++11 remotes/origin/master [mirror@hugemeow rtorrent]$ git tag 0.9.0 0.9.1 [mirror@hugemeow rtorrent]$ git clean -dfx Removing Makefile.in Removing aclocal.m4 Removing autom4te.cache/ Removing config.guess Removing config.h.in Removing config.log Removing config.sub Removing configure Removing depcomp Removing doc/Makefile.in Removing install-sh Removing ltmain.sh Removing missing Removing src/Makefile.in Removing src/core/Makefile.in Removing src/display/Makefile.in Removing src/input/Makefile.in Removing src/rpc/Makefile.in Removing src/ui/Makefile.in Removing src/utils/Makefile.in Removing test/Makefile.in Edit 1: details about libtool and libtools [mirror@hugemeow rtorrent]$ libtoolize --version libtoolize (GNU libtool) 1.5.22 Copyright (C) 2005 Free Software Foundation, Inc. This is free software; see the source for copying conditions. There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. [mirror@hugemeow rtorrent]$ libtool --version ltmain.sh (GNU libtool) 1.5.22 (1.1220.2.365 2005/12/18 22:14:06) Copyright (C) 2005 Free Software Foundation, Inc. This is free software; see the source for copying conditions. There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

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