Greatest Hits

5
votes
1answer
40k views

How to execute datapump commands as sysdba from remote machine

I would like to know the syntax to call datapump commands (expdp/impdp) logged as 'sys as sysdba' from a remote machine. I know that when logged on the machine which runs the database, I can use : ...
6
votes
3answers
30k views

openssl client authentication error: tlsv1 alert unknown ca: … SSL alert number 48

I've generated a certificate using openssl and place it on the client's machine, but when I try to connect to my server using that certificate, I error mentioned in the subject line back from my ...
11
votes
6answers
25k views

Tools for simulating DDoS attacks

I wanted to test my website if it can sustain strong DDoS's, but I don't know which tools could I use to simulate them in my website. What tools are used to simulate DDoS? I found bonesi but it was ...
20
6
votes
3answers
15k views

What is the difference between a HBA card and a RAID card?

I thought I knew the difference between HBA and RAID. In my mind, HBA is offloading from the main motherboard/CPU and is simply JBOD... usually has an external SAS ports, whilst a RAID card does the ...
5
votes
4answers
36k views

Windows Update not working on Windows Server 2008 R2

The Windows Update screen comes up and I click on Download Updates. I then get the bar scrolling across the screen and it says Downloading Updates but the counts never increase (0 KB total, 0% ...
6
votes
2answers
29k views

how to uninstall mariadb and re-install mysql ? Mysql install turns into mariadb install

I recently upgraded my centos system via the desktop. mistake! I had mariadb, phpmyadmin working just fine before - but after the upgrade they stopped. I frantically googled and tried to follow some ...
8
votes
2answers
24k views

Filtering Security Logs by User and Logon Type

I have been asked to find out when a user has logged on to the system in the last week. Now the audit logs in Windows should contain all the info I need. I think if I search for Event ID 4624 (Logon ...
6
votes
3answers
19k views

Would it be advised to use Ubuntu 14.04 LTS over 12.04 LTS?

I'm unsure how to ask this question, but I'm switching hosting companies and got to migrate everything. I'll probably set up everything up manually, no copy paste work, except the regular files. ...
7
votes
3answers
19k views

Stop log off when disconnected from RDP session

I don't want my VPS to log off disconnected sessions. It's really annoying because some programs freeze then. OS is Windows Server 2008 R2. How do I prevent disconnected sessions from being logged ...
18
2
votes
1answer
17k views

server can't find XXX.in-addr.arpa: NXDOMAIN

I am facing problem while configuring BIND DNS sowing server can't find XXX.in-addr.arpa: NXDOMAIN while reverse dns check! everything works on forward DNS lookup but reverse DNS lookup fails. Here ...
9
votes
1answer
46k views

What does “net_ratelimit: 44 callbacks suppressed” mean on a linux based router?

I'm trying to tune Snort performance on a Debian based router. I was seeing stuff like: snort packet recv contents failure: No buffer space available So I upped the buffers to 8M and when that ...
14
votes
1answer
20k views

An upstream response is buffered to a temporary file

I have a rather large and slow (complex data, complex frontend) web application build in RoR and served by Puma with nginx as reverse proxy. Looking at the nginx error log I see quite a few entries ...
8
votes
2answers
27k views

Nginx: location regex for multiple paths with backend

I have two locations in nginx config that work: location ^~ /media/ { proxy_pass http://backend.example.com; } location ^~ /static/ { proxy_pass http://backend.example.com; } How can I combine ...
15
votes
1answer
28k views

What is causing Access Denied when using the aws cli to download from Amazon S3?

I'm really flailing around in AWS trying to figure out what I'm missing here. I'd like to make it so that an IAM user can download files from an S3 bucket - without just making the files totally ...
14
votes
2answers
16k views

What are the possible issues in using very short DHCP lease time (< 1min)?

We have a network setup for a demo, which lasts about 15mn. Our DHCP server is configured to assign ~ 100 addresses (max number of simultaneous connections or our AP) ... but since people might come ...
12
votes
4answers
36k views

Cannot switch, ssh to specific user: su: cannot set user id: Resource temporarily unavailable?

/var/log/secure: su: pam_keyinit(su-l:session): Unable to change UID to 500 temporarily su: pam_keyinit(su-l:session): Unable to change UID to 500 temporarily su: pam_unix(su-l:session): session ...
6
votes
4answers
13k views

Getting a list of all the snapshots in VMs managed by vCenter?

We have multiple ESXi servers managed by a vCenter; is there a way to get a list of all the snapshots in all the VMs?
6
votes
6answers
18k views

CleanMgr can nolonger be installed on server 2012 R2

Just tried to get cleanmgr installed and working on a fresh 2012 R2 install. Copies CleanMgr.exe & CleanMgr.exe.mui across like done before but when it is run get error: The Program or feature ...
13
votes
4answers
23k views

Nginx: How do I forward a http request to another port?

What I want to do is, When someone visit http://localhost/route/abc the server response exactly the same as http://localhost:9000/abc Now I configure my Nginx like this: location /route { ...
18
6
votes
9answers
30k views

ConfigMgr 2012 - How to automatically make updates available to computers without forcing them to be installed?

I'm using System Center Configuration Manager 2012 with the Software Update Point feature; however, in this environment patching has to be strictly manual, because server reboots need to be approved ...
4
votes
2answers
20k views

keytab auth against samba 4 DC: Client not found in Kerberos database while getting initial credentials

I set up a samba 4 active directory on ubuntu 14.04 following Samba AD DC HOWTO. In principle everything works well but I'm stuck in getting kerberos authentication running using SPNs for web ...
24
votes
3answers
30k views

How to list Apache enabled modules?

Is there a command that list all enabled Apache modules?
10
votes
5answers
41k views

How can I manually run a nagios check from the command line?

When defining and testing new services in nagios I have been restarting nagios, then clicking the service, and rescheduling a check for as soon as possible, then waiting until the check happens. Is ...
2
votes
3answers
21k views

'The'account is not authorized to login from this station' error while trying to acccess network share

Clients are getting this error when trying to access network shares on one of our 2008 R2 servers: The account is not authorized to login from this station. The problem started a few weeks ago. ...
17
votes
5answers
40k views

KVM: Which CPU features make VMs run better?

We are using Ubuntu 12.04 with the following parameters: Dell R910 Kernel 3.2.0-25-generic #40-Ubuntu SMP x86_64 x86_64 x86_64 GNU/Linux kvm 1:84+dfsg-0ubuntu16+1.0+noroms+0ubuntu13 qemu-kvm ...
1
vote
2answers
20k views

nslookup requests time out regardless of server - ping is fine

I've been having intermittent internet connection issues for a week or so now. I now suspect that these are just DNS issues rather than connection issues. At the moment I can ping google.co.uk no ...
9
votes
2answers
20k views

Using CA certificate for Remote Desktop Connection

I’m connecting over the web to a remote Windows Server 2012 R2 via Remote Desktop Connection for administration needs. It is a single web and database server without an AD etc. I’m not talking ...
10
votes
5answers
15k views

Clearing/Deleting Docker Logs

On our docker implementation on GCE, we are running out of space on the root file system. Since images themselves are stored on a separate 1TB volume, the images themselves shouldn't be the problem. ...
1
vote
2answers
34k views

Unable to ping computers via DNS domain name

I have two desktop computers and recently set up a third computer, a Windows Server 2012 box, for which I installed DNS on it and set it up as a domain controller. I was able to successfully set up ...
9
votes
5answers
25k views

How can I schedule a server restart from command line on Windows 2012?

I would like to schedule a one-time server restart, e.g. to finish installing updates early in the morning. How can I do this from the command line on Windows 2012? On Windows 2008, I would have used ...
3
votes
3answers
19k views

PowerShell - Limit the search to only one OU

Ive got this cmdlet and I'd like to limit the results to only one OU: Get-ADUser -Filter {(Enabled -eq $false)} | ? { ($_.distinguishedname -notlike '*Disabled Users*') } Now Ive tried to use ...
9
votes
5answers
41k views

How to redirect domain A to domain B using A-Records and CNAME records only

I have 2 domains hosted with different hosts. I need to redirect Domain A to Domain B. Unfortunately I can't do a 301 redirect from Host A, but can only modify/add DNS entries (A-Records and CNAMEs) ...
-2
votes
1answer
16k views

Ports needed for the vSphere 5.5 client to connect to the vCenter

We are currently setting up a new vmware environement based on ESXi 5.5, with the virtual appliance and vSphere client. After a lot of research (maybe I didn't searched well), I couldn't manage to ...
1
vote
5answers
28k views

Outlook 2010 fails to connect to Exchange 2013

I have an Exchange Server 2013 and I am trying to connect using Outlook 2010. Both are running on the same server. The Outlook installation is just for testing mailboxes. Outlook first refused to ...
2
votes
1answer
23k views

Unable to add a static route: SIOADDRT: Network is unreachable

I've been bashing my head against a wall for a few days trying to figure this out: My ifconfig is: eth0 Link encap:Ethernet HWaddr 00:50:56:BB:XX:XX inet addr:192.168.36.132 ...
12
votes
1answer
19k views

dhclient: What does “RTNETLINK answers: File exists” Mean?

I wanted to update the DHCP lease of an Amazon EC2 instance, so I executed the following command: user@host:~$ sudo dhclient Following that, the system's DHCP lease is updated successfully updated. ...
2
votes
4answers
49k views

How to find out more hardware details using only ESXi4.1 and (possibly) shell

Running ESXi4.1 on an HP machine, with only remote access to the host ssh shell and the vmware console (no iLO), is there a way to gather a hardware report from the server? I am specifically ...
3
votes
4answers
64k views

Replacement for NewSID when working with Windows 7?

Is there a replacement for the old SysInternals NewSID utility that will work for Windows 7? I found out the hard way that NewSID will totally hose a Windows 7 setup (BSOD on reboot). Apparently the ...
2
votes
1answer
16k views

Let users install software without local administrator rights on domain

I manage the network of a small company. As I'm not always in the office it is a wish from the employees to be able to install software without having to go to me. My predecessor set it up that ...
9
votes
1answer
22k views

How to view connected users to open vpn server?

I'm developing a web site for managing open vpn users with django framework. But I need to now is there any way to extract active users from open vpn? My server is running Ubuntu 12.04.
20
votes
3answers
58k views

How do I enable apache modules from the command line in RedHat?

How do I enable apache modules from the command line in RedHat? On Debian/Ubuntu systems I use a2enmod to enable modules from the command line. Is there an equivalent for RedHat/CentOS type systems? ...
0
votes
1answer
8k views

Job for httpd.service failed

after following this tutorial :https://www.digitalocean.com/community/tutorials/how-to-create-an-ssl-certificate-on-apache-for-centos-7 I have tried everything I possibly can to fix the error I have ...
4
votes
3answers
30k views

Activating MS Office 2013 Standard via KMS running on the same server

Given: Microsoft Windows Server 2008 R2 Enterprise 64-bit, all the latest security updates applied. KMS service set up and running, all the recommended updates applied (to handle possible activation ...
2
votes
4answers
19k views

SCCM - How to make new deployed applications appear in Software Center faster?

I am trying to make the process between SCCM deployments and the Software Center (configmgr) faster, if not seamless. Right now, applications generally take about 1-2 hours to populate properly. ...
6
33
votes
2answers
3k views

Why was I able to delete a file owned by root in my home directory without being root?

So I was doing some maintenance on my server earlier today and noticed I was able to delete a file owned by root in my home directory. I was able to reproduce a sample: [cbennett@nova ~/temp]$ ls ...
3
votes
3answers
4k views

File permissions issue on OS X El Capitan and SMB share

Since we upgraded to OSX El Capitan we experienced some strange file permissions errors with our SMB server. We have a ubuntu server machine hosting our working files over a SMB shared folder to each ...
4
votes
2answers
25k views

Apache URL rewriting in reverse proxy

I'm deploying Apache in front of a Karaf-hosted application (Apache and Karaf are on separate servers). I want Apache to operate as a reverse proxy and also to hide part of the URL. The URL to get ...
10
votes
2answers
32k views

Run Elevated Powershell prompt from command-line

Is there a way to run a Powershell Prompt with Elevated privileges from a command linein Server 2012? Problem is this is 'Minimal Server Interface' mode without full server-gui installed so I can run ...
8
votes
1answer
15k views

nginx set variable in location

I am trying to optimize my nginx configs, so it would be possible to set one variable, and all location paths would update automatically. I have four lines in question: server_name php.domain.com; ...
5
7
votes
1answer
25k views

Why does WireShark think this frame is a TCP segment of a reassembled PDU

Please find a small pcap file here illustrating my problem. I have a three-way TCP handshake, followed by two FIX logons. (FIX is a protocol used in trading.) The first FIX logon (frame 4) is ...