Newest Questions

Q&A for system and network administrators

Low memory usage on VPS Ubuntu

I have VPS server with installed Ubuntu on it. Total RAM 16GB, but my server use only 3-4GB ... The question is why ? I set innoDB to use 12GB but nothing change. Server load 1.5 How can I increase ...

How could one add bridge to yet another bridge?

Ubuntu 16 LTS. Asked here, because the question is not really specific to GNU/Linux distributions, as the same concepts exist in another OSes. I added 4 dummy interfaces: modprobe dummy ip link add ...

Azure IAAS SharePoint Farm - Custom domain

I have been tasked with figuring out how to setup a SharePoint 2016 farm in AZURE IAAS with VMs. I have a dev farm setup with a virtual network with DC, SQL, Single Farm VM. I have an internal domain ...

What is the difference between fiber optic transceiver and optical module?

Sometimes fiber optic transceiver is called optical module, sometimes not, so what is the difference between them?

How to use AWS Batch?

I am trying to use the new AWS Batch feature: https://aws.amazon.com/batch/ I cannot get even the simplest Batch job to run (using the demo which is "echo hello world"). The job just keeps getting ...

How to best setup a simple route between two datacenters using dns, nat, and vpn?

The goal: Setup two routes with DNS records, between two data centers with 1 behind a NAT. Where data center Alpha can reach any IP in Beta, but data center Beta can only reach Alpha by going though ...

Detect bots with bash/shell [duplicate]

i should parse some log file to detect bots. I have two tasks: - user has made auth in, user changed password, user has made auth of within same second - actions (has made auth in, change, has made ...

Apache reverse proxy with IIS SNI returning 404

I use an Apache reverse proxy to a number of IIS sites. When using IIS 8.5 with SNI I'm getting 404s back when I take an app pool and site offline. Traditionally there would be no response and the ...

What is this network device? [migrated]

Context: In a quest to convert my home from 100Mbps to gigabit, I encountered this device. Cables from the wall are coming in, Ethernet cable going out. As far as I understand, this device converts ...

External IP configuration - connection being refused

I created a VM-instance, say myVM on GCE. I assigned an external IP address during this. I then changed this IP address from ephemeral to static. When I look up at External IP Addresses page (https:...

gmail: trust me, I know what I'm doing

I have a mailserver for my family domain name, and I want to forward my mail me@myname.dom to myname@gmail.com For most mail it works ok, but it breaks for domains with spf. I've tried different ...

No network connectivity in KVM guest

I'm attempting to set up my first guest set up under KVM and am having trouble getting the network working. The host machine "vm_host_box" has a static IP of 4.4.4.185. The guest I am setting up ...

MacOS Sierra iMac Apache, FTP, MySQL Not Responding

I'm upgrading server hardware for a client to a new iMac running MacOS 10.12. We run MySQL, Apache and FTP services on their local network. The problem I am having is that these services become ...

Error: Your request can't be completed right now. Please try again later. exchange server 2013

previously i steuped a exchange server 2013 on a 2013 R2 few hours it worked well but now it shows Error: Your request can't be completed right now. Please try again later. when accessing mail ...

Windows firewall blocks port connection even it's allowed

I have setup windows firewall rules to allow port 443 and 9000 to be allowed though inbound and outbound connections, and allowed the apache httpd.exe though the firewall as well. But as shown by my ...

How to make a domain I am renting appear in namecheap as a yearly price [on hold]

I have some sites I rent out on epik.com and I have seen the price for sites on namecheap such as work.design and it says 130.00/year, how do I make my site show this, when I questioned namecheap live ...

How to block access to web-hosting servers?

Is there a way to block all web-hosting servers trying to access my server? There are a lot of hacked websites used to do damage to my server and only common thing is IP of agressor (many of IP's) is ...

How do you keep a window from stealing focus in GNOME Shell? [migrated]

I've got multiple workspaces and two monitors in my GNOME Shell, and I'd like to find a way to exclude a window on my secondary monitor from ever stealing focus. Ideally, it'd be nice to exclude ...

Redundant Power Supply Sloshing (If sloshing is the right word)

I have a Supermicro Redundant Power Supply with two units in it. I also have two UPS units, one for each of the Power Supplys. I was watching the LCD on the UPSs for the watt usage. The total watts ...

Apache mod_rewrite or mod_proxy usage

Have a need to give outside access via an apache server (2.4) to a couple of inside machines on a LAN. Machine has a valid hostname, and has another network connection into the LAN. Internally the ...

Allow a user to read some other users' home directories - Windows

I have an user - reception with a home directory ("\nas\home") which I want to share it with another user only i.e.: john I'm looking for a way around of it as we the way SMB home shares are treated ...

std output and error from functions

Is there a way to get the standard output and estandard error from the functions inside a bash script? This is what "I thought" I was trying to accomplish with my script: #!/bin/bash LOGS="tmp/sync....

Should the Default Gateway be Firewall or DHCP/DNS server on Windows Domain Client PC

This is a bit of a theorteical question but it determines how I set up. On a Client computer within a Windows network should the "Default Gateway" be set to the Firewall or the DHCP server (which ...

Windows Update - translate Update GUID until Update “Microsoft KB” Number?

Am troubleshooting a complete windows update failure - on a brand new install, standalone Windows 2012 Server Essentials. Zero config, no existing infrastructure, "straight out of the box" setup. ...

Something closing SSH access on Plesk Onxy [on hold]

I am running a new VPS server from Heart Internet running Ubuntu 14.04.5 LTS‬ and Plesk Onyx 17.0.17. I have enabled the Firewall extension and have modified the ssh port to use something non-standard....

TFS 2015 Unable to deploy to to specific server, but Visual Studio can from the Build Agent server

I'm at a bit of a loss here, having checked all the usual suspects. One of the most baffling things is that I can deploy via Visual Studio on the Build Agent server, using the same url to the same ...

Amazon RDS: Why is Security Groups listed twice?

Via the AWS Management Console: I created an Elastic Beanstalk app configured with RDS. When I look at my Amazon RDS PostgreSQL DB instance details, I see Security Groups listed twice, with two ...

A secure way to access database from a Cordova app [on hold]

I have a question about my Cordova app server architecture, and I'm sorry if this is a very basic question for you. I'm developing a Cordova app and I've got the UI ready but I need data to my app ...

About Equallogic Dell storages controller replacement ? Active /Passive

About Equallogic Dell storages , is it possible to replace the active controller despite the running luns over it ? Or what should i do before replacing that ?

certmonger save chained certificate for nginx

We use certmonger to issue certs for backend systems, this works fine for apache but with nginx I must specify a chained cert. getcert request -f /etc/pki/tls/certs/$(hostname).crt -k /etc/pki/tls/...

Tomcat error “One or more listeners failed to start” - How can i get more details logged?

I have deployed a web app to a Tomcat service running on Windows, and there seems to be an error when creating the Guice injector, but as I understand, the logging of the details fails as the ...

Systemd PHP start script Centos 7

I have a PHP script I'm trying to create a service for. I've created the service however I can't get it to start. The weird thing is, the exact same service UNIT works on my other server of the same ...

Apache proxy / redirect https to https with one ip

I have one WAN-IP with an apache webserver which host A.domain.com and I will redirect B.domain.com to another server in the same local network. Without SSL I solved it this way in the vhosts: <...

How to map a domain name to a load balancer in google cloud platform?

I have successfully set up a load balancer in google cloud platform If I use the IP as shown in the image, I can test and verify that the set up is working as I planned. Now I would like to map a ...

Fedora 25 Workstation: Opened firewalld, can't ssh in

I installed Fedora 25 (Workstation) on one of my computers recently. This is my first experience with a RH-style distro -- I've previously only used Debian-based systems, and on those systems I used ...

exim4 - email clients unable to retrieve emails

I have configured exim4 on my Debian system and i am able to send emails from the server as a user and receive emails to this user. I am also able to connect mail client such as thunderbird/bluemail ...

Made condition to detect bots

I have a short log, where several columns - date, time, ip, name of user and operations, what user did Friday, 10 October 2012 13:15:39 +0300|192.168.110.5|rock| - |user has made auth in| - Friday, ...

Nginx server_name issue on HTTPS for multiple applications(vhosts)

I have two application on server which where were working perfectly until I planned to switch them to HTTPS. Nginx config for app 1: server_name abc.com my.abc.com static.abc.com Confing for app 2:...

Redis runs on OpenSuse 42.1, but throws many errors, How do I fix?

Installed Redis 3.2.4 on OpenSuse 42.1 with package manager. The machine has 16GB of memory. Did these steps to get running. (I would like to run as deamon, but havent changed the settings.) cp ...

websocketserver behind nginx and apache

How is it possible to establish a websocket connection through nginx and apache, where both act as reverse proxies. The system is setup with apache on the main host and a tornado webapplication in a ...

Only send SCOM alerts for a spacific set of copmuters to OMS

How do we configure SCOM 2012 R2 to only send a certain set of computers to OMS. We are only wanting to send our production server's alerts up to OMS. We have servers selected in the OMS section, but ...

On a vastly oversized server, how can I increase mailbox journaling performance if 1 million messages exist in the Inbox?

I have a journaling mailbox that is 250GB in size and has over 1 million messages in the inbox folder. I'm using a C# script I wrote to move messages from the Inbox of this mailbox into a smaller / ...

Use puppet to append to a file on one node

We have an existing puppet setup that is working well. However, on one node, I want to append a line to a configuration file. How do I do that? The file is currently fully defined in a manifest. The ....

mdadm removed drive from array as soon as it's done rebuilding

I have recently replaced a faulty drive in my RAID1 and attempted to introduce it to my array using mdadm. At around 95% the rebuild process failed due to detected bad sectors on the 'healthy' drive (!...

Hyper-V: Not able to ping my local VM from Host

I have an external wireless switch which I'm using to connect to my VM. I'm able to access internet on my local VM. The problem is that I'm not able to ping it. I've done the following after reading ...

How to disable connection-specific dns suffix? [on hold]

Because of my high ping network, I tried to find something to fix it by the following website. http://www.tomshardware.com/answers/id-2822945/slow-internet-high-ping-day.html ipconfig /release ...

Does the RAID BBU battery charge while server is powered off?

The title says it all. I am trying to troubleshoot a problem with the battery in a BBU RAID cache. During POST, an error is given something to the effect that the battery is low, the RAID cache is ...

How do i redirect on my Server 2012 R2 incoming domain requests?

I have two virtual machines on my server which use port 80. How do i redirect sub1.home.home to machine 1 and sub2.home.home to machine 2 I think my router is not capatable for that, so port 80 ...

Public IP on vmware esxi ( Softlayer )

We have dedicated private ESXi server in Softlayer.The server on start had one private IP assigned to vmnic0 vmotion and 4 interfaces total. Interfaces are teamed ( vmnic0 and vmin2 - privat / ...

Log shipping between SQL 2012 and 2016 instances

My question is about SQL Server log shipping from instance having SQL 2012 and SQL 2016. Is it possible to implement? The error I am getting is, SQL server doesnt allow database/log to be restored in ...
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