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• Excessive Outbound DNS Traffic

  - by user1318414

  I have a VPS system which I have had for 3 years on one host without issue. Recently, the host started sending an extreme amount of outbound DNS traffic to 31.193.132.138. Due to the way that Linode responded to this, I have recently left Linode and moved to 6sync. The server was completely rebuilt on 6sync with the exception of postfix mail configurations. Currently, the daemons run are as follows: sshd nginx postfix dovecot php5-fpm (localhost only) spampd (localhost only) clamsmtpd (localhost only) Given that the server was 100% rebuilt, I can't find any serious exploits against the above stated daemons, passwords have changed, ssh keys don't even exist on the rebuild yet, etc... it seems extremely unlikely that this is a compromise which is being used to DoS the address. The provided IP is noted online as a known SPAM source. My initial assumption was that it was attempting to use my postfix server as a relay, and the bogus addresses it was providing were domains with that IP registered as their nameservers. I would imagine given my postfix configuration that DNS queries for things such as SPF information would come in with equal or greater amount than the number of attempted spam e-mails sent. Both Linode and 6Sync have said that the outbound traffic is extremely disproportionate. The following is all the information I received from Linode regarding the outbound traffic: 21:28:28.647263 IP 97.107.134.33.32775 > 31.193.132.138.53: 28720 op8+% [b2&3=0x4134] [17267a] [30550q] [28773n] [14673au][|domain] 21:28:28.647264 IP 97.107.134.33 > 31.193.132.138: udp 21:28:28.647264 IP 97.107.134.33.32775 > 31.193.132.138.53: 28720 op8+% [b2&3=0x4134] [17267a] [30550q] [28773n] [14673au][|domain] 21:28:28.647265 IP 97.107.134.33 > 31.193.132.138: udp 21:28:28.647265 IP 97.107.134.33.32775 > 31.193.132.138.53: 28720 op8+% [b2&3=0x4134] [17267a] [30550q] [28773n] [14673au][|domain] 21:28:28.647266 IP 97.107.134.33 > 31.193.132.138: udp 6sync cannot confirm whether or not the recent spike in outbound traffic was to the same IP or over DNS, but I have presumed as such. For now my server is blocking the entire 31.0.0.0/8 subnet to help deter this while I figure it out. Anyone have any idea what is going on?

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• How do you keep track of all your passwords?

  - by Sam Saffron

  How do you keep track of all your passwords? Personally I host a personal copy of clipperz, I used keepass and passpack in the past. What password manager would you recommend, what features does it have that make it awesome? Now at 70+ "answers" it's a pretty good bet that your favourite program is already mentioned. Upvote that if that's the case. If you can't yet upvote, come back when you've gained enough reputation instead of posting a duplicate answer.

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• SQL Server: error when connecting

  - by atricapilla

  (migrated from stackoverflow) The application I'm using tries to connect SQL Server named instance running on a dedicated database server. Here's the error I'm getting: The TCP/IP connection to the host <instance_name>, port 1433 has failed. Error: Connection refused: connect. Is the firewall blocking my access or what? Should I dedicate a different port for this application?

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• Killing all processes of current user

  - by Vi

  user@host$ killall -9 -u user Will it definitely kill all processes owned by user (including forkbombs)? No new processes is spawned to user from other users. No user's processes are in D-sleep and unkillable. No processes are trying to detect and ptrace or terminate this started killall. E.g. if killall will finish untampered and successfully is it 100% that no processes are left with this uid?

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• IPv6 6to4 on Windows Server

  - by Graham Wager

  I'm looking for a relatively simple guide to setting up an IPv6 tunnel properly. This network currently has a server (Windows Server 2008R2) running RRAS that establishes connectivity to the internet using a demand-dial PPPoE connection and handles the NAT. It also hosts a DNS server and DHCP. My ISP does not support IPv6, but I have a static IPv4 address. I've read about 6to4 and signed up at tunnelbroker.net, but quickly felt out of my depth. How do I configure my network to use it, and how I should configure my DHCP server with regards to IPv6 addresses?

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• Run VirtualBox in background, without a window

  - by Bashman

  Hi! I was wandering if it's possible to run an Ubuntu virtual machine using VirtualBox in background, I mean, without any window open. The idea is to conect via SSH to the linux host, that would be running in background. Have you ever done somenthing like this? Is it possible? Thanks!

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• Remote MySQL connection fails (10060)

  - by Stefan Åstrand

  When I am trying to connect to a MySQL database from a remote computer I get a prompt saying: Connection Failed: [HY000] [MySQL][ODBC 5.1 Driver]Can't Connect to MySQL server on 'XXX.XXX.XX.XX' (10060) I have created a user account in the MySQL Administrator and added a host to enable remote access, I have also made an exception for my Windows Firewall on port 3306 but the connection still fails. What is the problem? Thanks!

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• Network and Server Management Tools

  - by jessieE

  We are building a farm of test servers. Currently we have 8 servers. We are planning to use the servers to test the following Mysql Cluster Xen or KVM virtualization Heartbeat/Pacemaker/DRDB What tools do experienced sysads use for: Initial installation of operating system( installing centos 5 or ubuntu server manually 8 times seems like a tedious task that just begs for automation) Centralized Configuration Management and Software Updates for Host and possibly Guest(virtualized) servers Hardware, Services and Network Monitoring

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• Apache / Postfix / Cyrus question

  - by Lerikun

  Apache: I have multiple domains on one hosting. I have a web-management software listening to port 3000 and one phpmyadmin. Can I restrict access to a certain domain? I mean that example.com:3000 will work and notexample.com:3000 not? (same for phpmyadmin) UPD: I have 3 IP's pointing to that host. Postfix/Cyrus: What is the right config to reject emails to mailboxes which do not even exist? (LDAP) Thanks

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• Deny login from certain hosts if logging in with specific sql credentials

  - by Dave

  I want to stop some of our developers from connecting to the production sql server using a specific sql account. They have rights to connect through windows authentication with lower rights. They claim that changing the password will affect too many other processes running on our processing machine. So I want to deny access if they're connecting from there dev machines for now. Another way this would work is if I could just allow connections from one specific host.

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• Some emails are being delivered, some returned

  - by Tom Broucke

  I have my own VPS where a site is running (control panel: directadmin). When I send mails, some are being delivered (hotmail, gmail, [email protected] ,...), others are not ([email protected]), others are delivered after being greylisted ([email protected]). /var/log/exim/mainlog What could be the cause of this? Is the problem Sender-Side or Receiver-Side? case 1: [email protected] (delivered) 2012-06-20 15:02:03 1ShKXr-0005Sc-7g <= [email protected] U=apache P=local S=1319 T="Password reset" from <[email protected]> for [email protected] 2012-06-20 15:02:03 1ShKXr-0005Sc-7g gmail-smtp-in-v4v6.l.google.com [2a00:1450:8005::1b] Network is unreachable 2012-06-20 15:02:03 1ShKXr-0005Sc-7g => [email protected] F=<[email protected]> R=lookuphost T=remote_smtp S=1355 H=gmail-smtp-in-v4v6.l.google.com [173.194.67.27] X=TLSv1:RC4-SHA:128 C="250 2.0.0 OK 1340196103 cp4si34336466wib.14" 2012-06-20 15:02:03 1ShKXr-0005Sc-7g Completed case 2: [email protected] (not being delivered) 2012-06-21 09:57:14 1ShcGQ-0007No-5H <= [email protected] H=localhost ([91.230.245.141]) [127.0.0.1] P=esmtpa A=login:[email protected] S=740 [email protected] T="hey" from <[email protected]> for [email protected] 2012-06-21 09:57:14 1ShcGQ-0007No-5H ** [email protected] F=<[email protected]> R=virtual_aliases: 2012-06-21 09:57:14 1ShcGQ-0007Nt-7Z <= <> R=1ShcGQ-0007No-5H U=mail P=local S=1546 T="Mail delivery failed: returning message to sender" from <> for [email protected] 2012-06-21 09:57:14 1ShcGQ-0007No-5H Completed 2012-06-21 09:57:14 1ShcGQ-0007Nt-7Z => info <[email protected]> F=<> R=virtual_user T=virtual_localdelivery S=1643 2012-06-21 09:57:14 1ShcGQ-0007Nt-7Z Completed case 3: [email protected] (greylisted) 2012-06-21 15:29:02 1ShhRW-000862-BV <= [email protected] H=localhost ([91.230.245.141]) [127.0.0.1] P=esmtpa A=login:[email protected] S=782 [email protected] T="testmail squirrel" from <[email protected]> for [email protected] 2012-06-21 15:29:02 1ShhRW-000862-BV SMTP error from remote mail server after RCPT TO:<[email protected]>: host mx-cluster-b1.one.com [195.47.247.194]: 450 4.7.1 <[email protected]>: Recipient address rejected: Greylisted for 5 minutes 2012-06-21 15:29:02 1ShhRW-000862-BV == [email protected] R=lookuphost T=remote_smtp defer (-44): SMTP error from remote mail server after RCPT TO:<[email protected]>: host mx-cluster-b2.one.com [195.47.247.195]: 450 4.7.1 <[email protected]>: Recipient address rejected: Greylisted for 5 minutes Notice that the "from" in case1 differs in case2: [email protected] or [email protected]. Thanks for your time!

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• Upload database backup from mysql to Amazon S3 or Glacier without creating local file

  - by Rubem Azenha

  Is there a tool that makes possible to backup a Mysql database to Amazon S3 or Amazon Glacier without having o create a local file with the database contents? Something like that: mysqldump -u root -ppass -h host --all-databases | magical-s3-tool s3-bucket backup-yyyy-mm-dd.sql This magical tool would use the pipe data and transfer the backup data directly to S3, without creating a local file.

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• Mount VirtualBox VDI disk

  - by Bart van Heukelom

  I have a virtual Windows 7 computer using VirtualBox on a Linux host. How can I mount this virtual pc's harddisk (VDI file) in Linux? It's a dynamic file, meaning that it only takes up as much space as is actually used.

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• Is there any problem using the ftpd that comes with Kerberos on CentOS?

  - by Chen Levy

  Hello, I need to configure ftpd on a CentOS 5.3 host to allow anonymous ftp (upload and download) from a well defined directory. I wish the setup to be as simple as possible, and to introduce as little new dependencies as possible. Scanning the current server configuration, I found the ftpd server that comes as part of the Kerberos workstation: > rpm -ql krb5-workstation | grep ftpd$ /usr/kerberos/sbin/ftpd Is there any reason I could or should not use this ftp server?

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• Possible to simulate a NDMP backup?

  - by Sandra

  I like to try Amanda's and Bacula's NDMP backup features, but I don't wan't to try it out on the live NAS, just yet. Ideally would I like to find out which that suites me best, and get familiar with before trying to make a real NDMP backup from the NAS. Question Is it somehow possible to simulate a NDMP backup with some Linux hosts? Or formulated in another way: Does there exist a NDMP daemon I can install on a Linux host, so it pretends to be a NAS?

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• 2xAMD Opteron 6128 with libvirt, Physical CPU 13 doesn't exist

  - by yak

  I need help with libvirt(?) problem. Server specs: ProLiant DL165 G7 2x AMD Opteron(tm) Processor 6128 System: Debian GNU/Linux testing (wheezy) 3.2.0-3-amd64 libvirt 0.9.12-5 kvm 1:1.1.2+dfsg-2 $ grep processor /proc/cpuinfo | wc -l 16 $ virsh nodeinfo setlocale: No such file or directory CPU model: x86_64 CPU(s): 16 CPU frequency: 800 MHz CPU socket(s): 2 Core(s) per socket: 4 Thread(s) per core: 1 NUMA cell(s): 1 Memory size: 66114200 KiB $ virsh capabilities .. <topology> <cells num='4'> <cell id='0'> <cpus num='4'> <cpu id='0'/> <cpu id='1'/> <cpu id='2'/> <cpu id='3'/> </cpus> </cell> <cell id='1'> <cpus num='4'> <cpu id='4'/> <cpu id='5'/> <cpu id='6'/> <cpu id='7'/> </cpus> </cell> <cell id='2'> <cpus num='4'> <cpu id='12'/> <cpu id='13'/> <cpu id='14'/> <cpu id='15'/> </cpus> </cell> <cell id='3'> <cpus num='4'> <cpu id='8'/> <cpu id='9'/> <cpu id='10'/> <cpu id='11'/> </cpus> </cell> </cells> </topology> .. $ virsh vcpupin vm 0 13,12,11,10,9,8,7,6,5 error: Physical CPU 13 doesn't exist. error: cpulist: Invalid format. Question? Why my VM Guests use only first 8 CPUs and next 8 are idling? $ for host in virsh list | awk '{print $2}'; do virsh vcpuinfo $host; done | grep ^CPU: | sort | uniq CPU: 0 CPU: 1 CPU: 2 CPU: 3 CPU: 4 CPU: 5 CPU: 6 CPU: 7 Any ideas how to change it?

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• Error starting postgresql server on ubuntu

  - by xain

  Hi, I recently stopped the postgresql database (that was working perfectly), and after a couple of days, when I try to start it, I get the errors: 2011-01-03 23:56:27 CLST LOG: could not translate host name "localhost", service "5432" to address: Name or service not known 2011-01-03 23:56:27 CLST WARNING: could not create listen socket for "localhost" 2011-01-03 23:56:27 CLST FATAL: could not create any TCP/IP sockets I'm running Ubuntu 9.1, and I'm using the usuals /etc/init.d/postgresql-8.4 start and stop Any hints ?

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• DNS Issue Windows 2003 AD-The server holding the PDC role is down

  - by Dave M

  Our network of Windows 2003 and Windows 2008 servers suddenly hasDNS issues. There are 7 DCs. Two at our main office and one each at branch sites (one branch has two a 2008R2 and WIN2K3) Only two are WIN2008R2 Running DCDIAG on the WIN2K3 at main site (DC1) reports no issues. Running at any branch site reports two issues All other test pass. The server DC1 can be PINGed by name from any site Starting test: frsevent There are warning or error events within the last 24 hours after the SYSVOL has been shared. Failing SYSVOL replication problems may cause Group Policy problems. Starting test: FsmoCheck Warning: DcGetDcName(PDC_REQUIRED) call failed, error 1355 A Primary Domain Controller could not be located. The server holding the PDC role is down. Netdom.exe /query DC reports the expected servers. netdom query fsmo This reports the server at the main office holds the following roles: * Schema owner Domain role owner PDC role RID pool manager Infrastructure owner In the DNS management snap-in, DC1 appears as DNS server but does not appear in _msdcs-dc-_sites-Default-First-Site-Name-_TCP There is no _ldap or –kerberos record pointing to DC1 Same issue msdcs-dc-_sites- -_TCP Again there is no _ldap or –kerberos record pointing to DC1 Under Domain DNS Zones there is no entry for the server. This is the case for any _tcp folder in the DNS. The server DC1 appears correctly as a name server in the Reverse Lookup Zone. There is a Host(A) record for DC1 but in the Forward Lookup Zone there is no (same as parent folder) Host(A) for the DC1 server but such an entry exists for the other DCs at branch sites and the other DC at the main office. We have tried stopping and starting the netlogon service, restarting DNS and also dcdiag /fix. Netdiag reports error: Trust relationship test. . . . . . : Failed [FATAL] Secure channel to domain 'XXX' is broken. [ERROR_NO_LOGON_SERVERS] [WARNING] Failed to query SPN registration on DC- One entry for each branch DC All braches lsit the problem server and it can be Pinged by name from any branch Fixing is number one priority but also would like to determine the casue.

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• How do I change a VMWare 1.x server's guest boot order?

  - by bo gusman

  I have 4 VMs on a Linux host, call them A, B, C, D running on Z. I really don't care when A and B come up, but I would like to make sure that D comes up before C. I believe that in VMWare 2.x it's possible to change the boot order. Is this possible in 1.x as well? Is this done in /etc/vmware/vm-list? I see that there are a number of VMs listed there, including some that have long since been deleted.

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• Determine hostname of connected ethernet switch

  - by Beastcraft

  I've a bonding on two interfaces. I'd like to monitor wether they are connected to different switches (the switches have hostnames). ethX should be connected to switchX and ethY to switchY. Currently I'm checking this with following command: tcpdump -vv -s0 -i ethX ether host 01:00:0c:cc:cc:cc After a minute it prints out the hostname (and much more information) from the switch. Are there any other solutions to monitor this? Greeting

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• RPM with RHEL: install 2 version of same package / different arch

  - by Nicolas Tourneur

  I think the title is pretty self explanatory :) Is it possible, under RHEL (v 5) to install 2 instances of the same packages with 32 bit support for one and 64 bits support for the other one? Obviously, the running host has a 64 bit kernel and has the compatibility libraries required. (in this case, we would need a 64 bits JDK and a 32 bits one). If yes, are there any special rpm flag to use (change of installation directory for instance)? Thanks in advance,

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• Setting up a subdomain in IIS?

  - by Abe Miessler

  I have an existing site that I would like to add a staging subdomain to. I created a new web site for it in IIS, added a host header for subdomain.mysite.com but when I try to get to the subdomain it is not found. Do I need to create an A Record in my DNS to point subdomain.mysite.com to the server's IP or will the existing entry for mysite.com work? If not, can anyone see what I am doing wrong here?

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• ssh connectivity issue

  - by achal tomar

  I have a CentOS 5.5 server hosted in a remote data center. I usually access this server from a Red Hat Enterprise Linux 5 server using the ssh command. Now my organization has implemented a proxy server, this is not allowing me to connect to the VPS server. I see the following error using the command root@<ip address>:-: ssh: connect to host <ip address> PORT 22: connection refused. Can anybody help me with this issue?

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• Wiki/CMS with synchronization?

  - by Clinton Blackmore

  We're looking into putting up a wiki or CMS for internal use by our IT department. One of the big things we want to use it for is disaster recovery procedures. Given that a disaster, such as a power or network outage, might render the wiki inaccessible, it seems sensible to to host the wiki in two places so that if one is inaccessible, we can fall back to the other. Are there any wikis or CMSes that synchronize (or an alternate way to achieve a similar end)?

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• Configuring sendmail to forward mail for a specific domain to a specific mail server without using M

  - by aHunter

  I am new to sendmail and would like to configure sendmail to forward all mail for a specific email address to another internal mail server. I need it to ignore the MX records and only send it to the server I specify but am not sure which files to edit or how to configure the sendmail config. Is it sufficient to add the server to the /etc/hosts and the /etc/mail/local-host-names files? Thanks in advance.

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