Operating Systems

35K

Solutions

36K

Contributors

Operating systems perform basic tasks, such as recognizing input from the keyboard, sending output to the display screen, keeping track of files and directories on the disk, and controlling peripheral devices such as disk drives and printers. For large systems, the operating system makes sure that different programs and users running at the same time do not interfere with each other. The operating system is also responsible for security, ensuring that unauthorized users do not access the system. Operating systems provide a software platform on top of which other programs, called application programs, can run.

Share tech news, updates, or what's on your mind.

Sign up to Post

My company has setup an Ubuntu 18.04 server, to exchange files with a client, via SFTP.  We need a high level of security.  We're trying to require authentication with SSH key pairs, AND the Linux OS username and password (not the SSH passphrase). We've got the key pairs working, but it doesn't ask for the password. I'm assuming we're just missing something in the sshd_config file. Hopefully we're not trying to do something that's not possible. Any assistance would be much appreciated.

Thanks!
Mark
0
Introducing Cloud Class® training courses
LVL 12
Introducing Cloud Class® training courses

Tech changes fast. You can learn faster. That’s why we’re bringing professional training courses to Experts Exchange. With a subscription, you can access all the Cloud Class® courses to expand your education, prep for certifications, and get top-notch instructions.

I am having printing issues when printing a document or test print to local printer or network printer.  I am getting an access denied.
I have look at other posts but none seem to answer my question.
OS - Windows 7 Pro 64bit
Does not matter who I login as - domain user, local account, admin account all get the same error.
I have deleted all printers, deleted all printer software from programs and deleted printer form print management.
Re-installed the local printer (USB) first from fresh download, updated the firmware on the printer  with no issues.  Once I attempt a test print or print from program get the same issues.  I cannot print to a file using Adobe print either.
0
i have 2 hosts on vmware cluster ( vcenter 6.7 and esxi 6.7)  ..  I want to achieve the below scenario

vm1 will be on host 1 ( vm1 will be Primary server )    , IP : 192.168.1.101 (e.g.)  
vm2 will be on host  2(vm 2 will be Secondary Server) ,IP : 192.168.1.102 (e.g.)

both will be identical

I want my users to login to this ip 192.168.1.100 (e.g.) as interface for the above IPs  so when any kind of problem happens to host 1 it directs them to the second host

can this be achived through vmware ?
or it should be done from os side ? ( using linux redhat and will use  pacemaker cluster)

thank you
0
I have a user that is getting access denied when trying to run Task Manager on Win10, below is what was done:

- SFC /scannow (no errors found)
- DISM Restore health
- Updated from 1703 to 1709, no change
- Updated to 1803, no change
- No other symptoms
- Logged in as a local admin and a domain admin and get the same results
- Pathing out to the EXE and also trying from an elevated CMD prompt gives the same results

I am needing advice to see if there is anything else to try besides a full OS reload
0
Hi,
I have deployed my code on two machines M1 and M2.
They fetch a USer Object which contains details about name, designation, emailID etc corresponding to a userId.
Currently i am storing them in cache like this :

import com.google.common.cache.Cache;
import com.google.common.cache.CacheBuilder;
    private Cache<String, User> userCache;
 userCache = CacheBuilder.newBuilder()
                .maximumSize(1000)
                .expireAfterWrite(60, TimeUnit.MINUTES).build();

Open in new window


But i just realized that there will be two caches on M1 and M2 separately. That could be an issue because say M1 caches data for a user. But the load balancer than sends the request to M2 and it will have to again fetch data.
what are the possible solutions to this ?
I can think of keeping another machine with all the cache data in RAM.
And so create a cache on M1 and M2 that programmatically connects to this machine.
But then comes the problem of having one more replica of this machine because in case one is down then
we still have data access...
Please suggest what is used to solve this type of problem ?

Thanks
0
I recently stood up a new secure Ubuntu image and I am running nexpose on it.
Nexpose is configured to send email notifications when the scan starts and completes.
We have confirmed that nexpose is sending the emails;

2018-08-03T22:13:19 [INFO] [Thread: critical-task-executor1] Sending report to <correct recipient>.
2018-08-03T22:13:19 [INFO] [Thread: critical-task-executor1] Creating SMTP session to localhost:25
2018-08-03T22:13:19 [INFO] [Thread: critical-task-executor1] Delivered mail to <correct recipient>: 250 2.0.0 Ok: queued as 4BD9583179

But the reports are never being received.
I have been asked by the exchange person which SMTP relay server I have been pointing at.
I haven't been able to identify this question.
In Nexpose my configuration was imported from our old server so that should be the same.
The only thing I can think of is that some setting needed to be set on the OS side to get the emails to the SMTP relay server.

We are using postfix on the new image.
I have been searching for a place to configure the SMTP relay IP I was given but I haven't been able to find it.
Could someone point me in the right direction?
Thanks

DBG Guy
0
Hi,
Suppose there is file which has "rohit bajaj" written in it.
Now suppose two users login to a machine and cd to this file location both having read/ write access to this file opens the file and they modify it to --

1) First user
rohip pakka

2) Second User
pohit pakaj

And they save the file at the same time.
what will the file contain ? Or what are the possibilities for its content ?

Two clear possibilities are that the changes of user1 or user2 only are visible. Is there any other possibilty ? Kind of mixup of both ? and how ?

Thanks
0
How can I allow read/write permissions to the C://Windows folder?  I am using Windows 7 64 bit OS.  Thank you.
0
I have a large mailbox for and exceeding everyday, I had an acrchive file on My Windows machine, but now I am not able to use the archive on Mac OS. Is there any solution to use/see archive file on Mac system? If yes how?

Regards
0
Random websites unreachable on certain Mac computers running varying versions of OSX. Only seems to be affecting Mac computers, although not all of them.  I thought it might be related to our router, but I bypassed it and hooked the problematic machines directly to the cable modem and the issue remained. So my thought is there has to be something going on within the OS that is causing this. All browsers accessing the problematic sites act the same (Chrome, Safari, Firefox). The websites that are unreachable are seemingly completely random. Some include Gamestop.com, mycymbal.com, and barclaycardus.com. Pinging any of these sites via terminal gives a "request timeout", "host is down" error. Traceroute in Network Utility also results in "Host is down" error. In both cases the IP address of the host gets successfully resolved, but is unreachable.

I have no antivirus running on these machines. It's happening on Macs running 10.10.5 and 10.13.6.  Meanwhile, none of the PCs on the network seem to have the issue. This is really a frustrating head scratcher. Any troubleshooting ideas are appreciated!
0
Cloud Class® Course: Certified Penetration Testing
LVL 12
Cloud Class® Course: Certified Penetration Testing

This CPTE Certified Penetration Testing Engineer course covers everything you need to know about becoming a Certified Penetration Testing Engineer. Career Path: Professional roles include Ethical Hackers, Security Consultants, System Administrators, and Chief Security Officers.

I set up a server host OS and a VM in Hyper-V as a domain controller on a PC with a couple SSDs. When I got everything working, I cloned them over to a PowerEdge T330. Now my Hyper-V DC will not work with a static IP address. It cannot see the network PCs, ping out, or access the internet. If I set it to DHCP, I can access the internet, but nothing internal. I am at a loss as to why this is happening, however, I need to fix this as soon as possible. Does anyone have any ideas?
0
How would one go about upgrading MacOS devices to the latest OS (High Sierra at the time of this post) through terminal commands only?  For example, a device running El Capitan needs to be upgraded to High Sierra.  I am looking to run this command across multiple MacOS devices, and for a command or script that could run on any MacOS device.
0
Not able to access a dev site from the VPS server's ip address.  Hosting company says all configured correctly on the VPS and that I need to add the IP Address and domain to hosts file.
Is there a trick to updating hosts file on this Mac OS 10.13.6 version?  I've used sudo nano /etc/hosts added the server IP address and the domainname.com and ran the sudo killall -HUP mDNSResponder && echo macOS DNS Cache Reset.

Help with getting this working would be appreciated.
0
We need to upgrade our Server 2008 Enterprise SP2 to 2008 R2. We have to do this across several servers on our network. This is a host to multiple VM's. We gathered as much information as possible. Any advise to be on the lookout for after the upgrade?
0
how to reinstall mac os x  tiger 10.4 imac a1208 .. I have downloaded  macosx 9  virtual box  but I'm not sure how to open configure and where to start
0
Hi,


I have to update samba sun an AIX 7.1 TL 05 server, I currently have a version 3.6.25 and I want to bring it to a version samba-client-4.6.15-1.aix6.1.ppc.rpm downloaded from AIX Toolbox.
What operations should I do?
0
OS Version = 6.1.7601, SP = 1.0, Platform 2, Service Pack 1
 OS Description = Win7 - x86 Ultimate Edition Service Pack 1

MSI = 5.0.7601.24052
 Windows version = x86_windowsfoundation_31bf3856ad364e35_6.1.7601.17514_none_0541445eeedbd616.manifest
 Windows servicing = 6.1.7601.23505

CommandLine = C:\9ee15b01a210fac5903df85169c556\\Setup.exe /x86 /x64 /redist
 TimeZone = ??????, ?????? (????)
 Initial LCID = 1049
 Using Simultaneous Download and Install mechanism

Operation: Installing

Package Name = Microsoft .NET Framework 4.7.2 Setup
 Package Version = 4.7.03081

User Experience Data Collection Policy: AlwaysUploaded

Number of applicable items: 10
 Exe (C:\9ee15b01a210fac5903df85169c556\SetupUtility.exe) succeeded.
 Exe Log File: dd_SetupUtility.txt

ServiceControl operation succeeded!

ServiceControl operation succeeded!
 Exe (C:\9ee15b01a210fac5903df85169c556\SetupUtility.exe) succeeded.
 Exe Log File: dd_SetupUtility.txt
 MSI (C:\9ee15b01a210fac5903df85169c556\netfx_Full_x86.msi) Installation failed. Msi Log: Microsoft .NET Framework 4.7.2 Setup_20180731_093830339-MSI_netfx_Full_x86.msi.txt
 Final Result: Installation failed with error code: (0x80070643), "В процессе установки произошла неисправимая ошибка. " (Elapsed time: 0 00:08:47).

Open in new window

0
My system randomly freezes and there's nothing I can do. (windows 10 pro)

While it on freeze I can access files on the computer from anther computer.

the event viewer i get this error.

A timeout was reached (30000 milliseconds) while waiting for the Group Policy Client service to connect.
DCOM got error "1053" attempting to start the service camsvc with arguments "Unavailable" in order to run the server:
Windows.Internal.CapabilityAccess.Management.CapabilityConsentManager
0
I have a mac book with a 500 GB hard drive. 445 GB of its space is labeled "other". how can i find out what that is and eventually clear it out? the OS is sierra.
0
Cloud Class® Course: Amazon Web Services - Basic
LVL 12
Cloud Class® Course: Amazon Web Services - Basic

Are you thinking about creating an Amazon Web Services account for your business? Not sure where to start? In this course you’ll get an overview of the history of AWS and take a tour of their user interface.

I need help to export  two different registery  keys and import after OS is done.
I'm want to use this during refresh deployment usmt sccm tasksequence.


Help will be appreciated

Thanks
0
I have a computer that is running WinXP.  Would like to convert this physical computer to a virtual machine and run it on a Win2012 Server as a Hyper-V guest OS.  My questions are:
1. Does Win2012 Hyper-V server support WinXP as a virtual machine?
2. What software can convert this XP to a Hyper-V vm?  I heard of Disk2VHD....has anyone ever done this on an XP service pack 2?
0
I need some help in estimating the time it would take to build a QuickBooks server.

Currently  8 Users who need access to QB. 3 other users in the main office who don't need QB access.  10 users on remote jobsites with variable hotspot access that I was thinking of leaving in their own Workgroup if possible. Current environment is a standalone QB server in a Workgroup - no DC/AD as the OS is Multipoint Server. All users on O365.  

So, I'm scoping out the project but need help in estimating the time.  Proposed server to have 8-10 Cores, with 4 Hyper-V VMs.  8 HDDs RAID 6

VM0: 2 Cores, 4GB RAM: ADDS Server - File & Print, DNS, DHCP
VM1: 4 Cores, 16GB Ram: RDSH, QuickBooks
VM2: 2 Cores, 4GB Ram: RDBroker/GW/Web
VM3: 2 Cores,  8GB RAM: SQL


In addition to the server build time, I have to factor in the time to add 15 Office PCs (11 LT/DT & 4 Surface Pros ) to the domain and transfer profiles.   What are reasonable times to factor in to this build?


Thanks
Tom
0
A  workstation's Windows 10 OS was corrupted and wouldn't boot. I fixed it by running sfc.

When I was able to login, first thing that happened was a notification saying updates finished applying.  Is there any way to verify if an update caused the OS corruption? (laptop was shutdown/closed prematurely while update was applying , or another issue with the actual update etc)
0
Hyper V wont read .iso to install an OS on a VM.
0
I'm looking for a good tutorial / guide how to install imagemagick with libsvg (rsvp) support and Iamgick on a Debian System,

I found much on the internet but really ALL failed in case of wrong versions or finally without libsvg support.

Background: I use XAMPP V on a Mac that has installed a Linux (Debian) OS.
0

Operating Systems

35K

Solutions

36K

Contributors

Operating systems perform basic tasks, such as recognizing input from the keyboard, sending output to the display screen, keeping track of files and directories on the disk, and controlling peripheral devices such as disk drives and printers. For large systems, the operating system makes sure that different programs and users running at the same time do not interfere with each other. The operating system is also responsible for security, ensuring that unauthorized users do not access the system. Operating systems provide a software platform on top of which other programs, called application programs, can run.