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Q&A for system and network administrators

IPTables as GRE proxy in between two GRE hosts on linux

Is that possible to use iptables to forward bi-direction GRE packet in between two hosts? such as: ServerA_GRE <- Server B IPTables -> ServerC_GRE

How to scale backend Firebase service

I am building an application with a decent amount of Firebase service code running in the backend. It is possible that this App will end up reaching thousands and possibly hundreds of thousands of ...

No --wait or --no-async when creating Google Cloud container node pool?

I'm using Google Cloud / Google Container Engine, and I have infrastructure scripts where I create a cluster and node pools and then perform operations on the node pools once they're setup. In my ...

How to browse website hosted in Test server within company network

I have set up a website in IIS on QA server. I added binding and made entry in hosts file Binding IP: 123.43.12.45 Port: 80 HostName: mysite.mydomain.com Hosts file entry 123.43.12.45 mysite....

Can not start programs depending on explorer.exe (or explorer.exe itself)

I have a Windows Server 2008 R2 SP1 machine running in VMWare. After running Windows Update the machine starts. But the desktop does not appear. I can log in and I et to the blue background. I can ...

Check if a network is part of bigger network using Python [migrated]

This problem is part of bigger project. Let me start with the project first. That might help in explaining what I want to achieve. The company I work for, has a lot of AWS accounts and these accounts ...

power off vnx 5200 block

I have a question about powering down EMC vnx 5200. when i power off vnx 5200 according to instruction (in the unisphere environment) after 5 minute LED of SP Fault and SP Unsafe to remove and SP ...

Deploy application from local git repository

This is a two-fold question. In scenarios where the git repository is not publicly accessible, can I deploy from a local machine (that also runs Ansible) to a remove host using the local copy of the ...

Hardware and software needed to start VPN service? [duplicate]

I'm planning to setup a country wide gaming VPN ( for reducing ping obvio ). I haven't yet bought the hardware and hence would like to ask for help as this is my first time. There will be 100+ VPN ...

Expose client's network to other clients in OpenVPN net

I have a router (192.168.1.0/24) behind NAT that is a client to my OpenVPN server(internal net of which is 10.8.0.0/24). I also have another OpenVPN client (not from 192.168.1.0/24) that connects to ...

Restricting Office 365 services to ip range

My company has a office 365 subscription so all our Outlook, OneDrive, Skype etc. infrastructure is hosted for us online. I am trying to restrict our emails to a range of ip addresses (as we have just ...

cpu cores and clook speed comparison [duplicate]

is it better to have one server with A: Intel Xeon 2x E5-2650v2 16c/32t @2.6 Ghz or to buy 3 servers B: Intel Xeon E3-1245v5 4c/8t @3.5 Ghz so how i can compare, is this right way: 16c*...

SharePoint 2013 Alternate Access Mappings to add additional external and internal URL

I'm very new to SharePoint administration. Here's my scenario. I have a sharepoint, that I'm migrating. I'll call the current sharepoint "oldsharepoint", and the one I'm migrating to, "...

CSF firewall deny all IPs except cloudflare IPs

Is there any solution to deny all IPs except some specific IPs like cloudflare ones? Of course I don't want to add cloudflare IPs in CSF Allow List to access my critical ports, I just like to nobody ...

Nnginx map urls to proxy_pass in one location directive

I have multiple node websockets that are available through a url matching the UNIX socket paths. Instead of duplicating the location directive, I would like to have something like a list of Urls that ...

Synology Cloud Sync : How to read encrypted files in the cloud?

I own a Synology NAS which i synchronised with Google Drive using the 'Cloud Sync' feature. For security reasons, i used the Synology built-in feature to encrypt the files on the NAS before sending ...

cURL behaves differently with respect to SSL certificates when using -v (verbose) flag?

Using Ubuntu 16.04, curl version 7.47.0 I'm trying to debug an SSL certificate issue, and seeing odd behavior when using curl. When I just run: ubuntu@ip-172-30-0-81:~$ curl https://myapp.com/hello ...

Setting up SMTP for receving emails - can't connect from any remote host [on hold]

I'm trying to setup a private SMTP server on a VPS for receiving emails. I've opened firewall port on the server and in the hoster's control panel. I can telnet it from the server itself, but it fails ...

xenserver patches and just general questions on why xenserver [on hold]

Not sure where to post this so I thought here, I just recently become curious as to why choose xenserver over another linux dom0? I was primarily curious about the security patches and if these are ...

Grep of several lines one by one

i have small log file with event, what user doing and name of user. All of that, i have in two columns. Like that: fxsciaqulmlk|user logged in fxsciaqulmlk|user changed password fxsciaqulmlk|user ...

OpenVPN on Google Compute Engine - what route am I missing?

I have installed OpenVPN on other VPS providers, and wanted to try out Google's. I like Googles price/performance, and especially because I can spin up the machines from my phone without logging in ...

Possible to use G-Suite services & Personal Email Server on the same domain?

Is it possible for me to share email services. What I want to do in the name of saving money is. Have a email server using MailCow for example, as a fall back to my Google Provided services. Only a ...

VPN's DNS becomes unreachable from client and requires the client's networking service to be restarted/reloaded

I am using OpenVPN which pushes it's DNS server down when connecting to it. The problem is that the DNS service is unreliable, most of the time it works after the client is connected to the VPN but ...

pureftpd mysql auth working on one server but not others with same config

System: Ubuntu 16.04 Percona Server (using Galera cluster) pure-ftpd-mysql from the Ubuntu repositories The pureftpd database is replicated to all five servers in the cluster and I have ...

One of the slaves in RHEL bond doesn't work

I have a red-hat enterprise Linux 6.3 vm (VMware vsphere). I created a bond from two interfaces and it works but only when eth0 is active. When I use ifdown eth0 or echo -eth0 > /sys/class/net/...

PPTP link as second interface

I have a dedicated server running Debian 6.0 (squeeze) with a single (static) IP address: # ifconfig eth0 Link encap:Ethernet HWaddr 00:22:4d:ae:10:b8 inet addr:1.2.3.45 Bcast:1.2....

NGINX reverse proxy starts returning 502 errors

I have a API First app that has separate servers for the front end and back end. The frontend is just an NGINX server that serves a static Angular site. The backend is a Play Scala server. Recently, ...

Multi-Mailbox search partially succeeded on Exchange Server 2010 SP3 Rollup 15

I am running multi-mailbox searches and 90% of the time the searches are successful, but some result in "Search partially succeeded" with the error below. Originally, I ran these searches on Exchange ...

dnsmasq does not resolve local adresses

I am setting up a dnsmasq server at the moment with the capabiltity of acting as a DHCP server. Ive done a basic setup yet. My goal was to have a DHCP Server here that also resolves names and makes ...

Access MySQL Server behind IPSec Tunnel via EC2

I have an IPSec (OpenSwan) tunnel connecting 1.1.1.1 (Proxy) and 2.2.2.2 (MySQL-Server) Now I want to access 2.2.2.2 from the Internet via 1.1.1.1 so I created the following IPTables rule: iptables -...

CentOS 7 Kickstart - Software RAID 10 and LVM

So I am not sure why I am having this issue, so I hope someone can see something I am missing. I created a kickstart file for a test Cent OS 7 automated install. Nothing seems to generate a warning ...

how to schedule a non-maskable job in windows?

I would like to log list of running processes on my Windows Server 2012 and a Windows 10 machine. If I use Task Schedule, I have noticed that the scheduled task is delayed when cpu or memory peak ...

Dell r510 esxi raid 10 disk failure: lost config

I had a server go offline yesterday complaining of disk failure. I re-seated the disks in the set and all of the light went green. I rebooted the machine only to find that now it won't boot into esxi. ...

Does PowerDNS update DNSSEC records even if SOA serial does not change?

I'm trying to understand if PowerDNS slaves can update records even if the serial number in the SOA for the zone does not change. The scenario I have in mind is the following: There is one master ...

vCenter Prevent VM Deletion

I'm starting to play with automating VMWare vCenter using PyVMomi. I want to take some base images and clone them, do some work on them, then delete them afterwards. However, I'm terrified that I'...

LVM logical volume for /home partition corrupted after lvresize to increase swap space Fedora 25

I added 6GB of memory on an older Dell PowerEdge 1850 that we use just for backups to an attached hardware RAID from Promise Technology called a VessRAID connected by iSCSI. After a few weeks I ...

Server 2012 R2 System Recovery Loop (Hyper-v)

I was updating a 2012 R2 server. One update out of 4 failed during the update and I rebooted the server to apply the updates that were successful. After the initial reboot, the server went into "...

Can the prosody mod_mam be used with an internal storage?

The MAM module of prosody falls back to in-memory storage, when the configured storage (archive2) is set to internal. The source comments say, it needs an "archive capable storage like sql. There ...

Ho to launch WAIK training with virtual Windows Servers and Workstations? [on hold]

I am wondering how to launch a virtual testbed network with a server and workstations to teach WAIK and network installations? What are the best solutions?

Is Privoxy really useful with Hamachi in this case? [on hold]

I was reading this article and something came into my mind : why did the author use Privoxy + Hamachi in order to route all the internet traffic through the VPN-box and hence use its public IP address....

Managed vServer with Dediacted IP: Why are all outgoing mails to Gmail flagged as spam? [duplicate]

Dear Serverfault community, Noob asking: I am testing 2 different managed vserver providers right now. Both offer dedicated IPs and the one I am favoring at the moment has the problem that all ...

What kind of “streamlining” occurs when you use a single machine to generate load/stress?

The title of this question represents my main concern, but if you read on beyond the question section, you'll find some background about our set up.. which may or may not be relevant / useful. ...

After enabling http2 my website doesn't work anymore

I just upgraded apache to 2.4.25, everything was ok, after that I have enabled http2 module and inserted this in my virtual host: Protocols h2 http/1.1 After that I've tried to open site in browser ...

Centos 7 sssd authentication with authlite in child domain

Centos 7 server is joined to abc.com and authentication is working to abc.com with authlite for two-factor authentication. A child domain was created a.abc.com but authentication is not working to the ...

NanoServer WinRM HTTPS

Trying to configure nanoserver for WinRM Remote HTTPS access and all the tutorials I have been able to find use the WinRM command and I cannot figure out how to configure it any other way. Does anyone ...

.htaccess deny access multiple files

I would like to deny access to multiple files with exactly name. So I tried with no success: <Files config.inc.php config_smtp.inc.php> Order allow,deny Deny from all </Files> I ...

Moving DNS management from Office 365 to my own host

At the moment the DNS for our domain is managed at Office 365. This means the NS records point to Microsoft (dig -t ns ourdomain.com): ns1.bdm.microsoftonline.com ns2.bdm.microsoftonline.com ns3.bdm....

Has anyone connected a windows 10 home machine to a 2008 r2 server via connect?

Is this possible? This question is a sort of follow up to this. TL;DR - I've been asked by work to ugrade a network to remove windows XP terminals. We've bought in a dozen or so windows 10 boxes, ...

Unable to open kate using Ubuntu [on hold]

I run Xming, open ubuntu as root@OWNER, and input these commands: DISPLAY=:0.0 export DISPLAY xhost + kate After running kate, I get a handful of errors. QDBusConnection: session D-Bus connection ...

Exim Split Delivery

I'm hoping someone can help me here. I've had this working before and had the correct smarthost code for the exim configuration but my computer crashed and I lossed it, now I can't remember what it ...
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