Greatest Hits

8
votes
1answer
42k views

How to kill a hung service on Windows 2008R2

I have a Windows 2008R2 server running NSClient++. For some reason the service has got its knickers in a twist and stopped responding to Nagios polling. When I tried to restart the service the ...
19
votes
6answers
25k views

2008 R2 Terminal Server: “Insufficient system resources exist to complete the requested service”

I'm working with an unhealthy Windows 2008 R2 Terminal Server configured in a vSphere environment. It currently has 4 vCPUs and 32GB RAM. No overcommitment. The concurrent user count on this server ...
6
votes
1answer
24k views

Openvpn routing for lan to lan through tun

I am trying to setup an OpenVPN tun to connect two lan's The open vpn connection is up and working but there is a problem with my routing or nat or something. What I need is an example of what a ...
14
votes
2answers
18k 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 ...
9
votes
1answer
20k views

Postfix: Recipient address rejected: User unknown in local recipient table, even though recipient domain is an external domain

In my company infrastructure, I have an internal mail server with postfix whose name is, say, srv-internal.central.mydomain.tld with internal IP 10.10.128.200. For exchanging mails with the Net, it ...
2
votes
2answers
18k views

Can't allow users to log in via SSH (Bash, OpenSSH, CentOS 6.5)

I am running a CentOS 6.5 machine remotely via SSH. I use RSA keys and have disabled password authentication. The problem that I am having is that whenever I add a new user and want him/her to log in ...
3
votes
3answers
18k views

Has Windows Server Backup's Disk Space Management Changed in Server 2012?

Summary I have a Server 2012 (not R2) Hyper-V Host server using Windows Server Backup (WSB) to back up about 670 GB of data to three 1 TB USB hard drives, rotated weekly. The server was installed ...
0
votes
2answers
10k views

'openssl verify' outputs 'unable to get local issuer certificate'

In /etc/ssl, when I do sudo openssl verify mywebsite.pem I get a message stating mywebsite.pem: OU = GT46830179, OU = See www.rapidssl.com/resources/cps (c)15, OU = Domain Control Validated - ...
3
votes
3answers
16k views

iLO 3 Firmware Update (HP Proliant DL380 G7)

The iLO web interface allows me to upload a .bin file (Obtain the firmware image (.bin) file from the Online ROM Flash Component for HP Integrated Lights-Out.) The iLO web interface redirects me to ...
8
votes
1answer
20k views

What's the difference between sudo su - postgres and sudo -u postgres?

PostgreSQL users peer authentication on unix sockets by default, where the unix user must be the same as the PostgreSQL user. So people frequently use su or sudo to become the postgres superuser. I ...
6
votes
3answers
19k views

Increasing ulimit on CentOS

We have a CentOS box that I'm trying to increase the max number of files that a user can have open. Currently when I run ulimit -Sn I get 1024 and ulimit -Hn gives 4096. I need that number up around ...
2
votes
4answers
22k views

Nothing appearing in kibana dashboard

I have installed Logstash ElasticSearch Kibana on an EC2 instance. I can visit http://example.com:9200 Here I get { "status" : 200, "name" : "Aleta Ogord", "version" : { "number" : "1.1.0"...
21
votes
1answer
21k views

How does vm.overcommit_memory work?

When I use the default settings: vm.overcommit_memory = 0 vm.overcommit_ratio = 50 I can read these values from /proc/meminfo file: CommitLimit: 2609604 kB Committed_AS: 1579976 kB But ...
3
votes
4answers
24k views

OpenVPN and Routing and IPtables

GOAL: Access internal network devices and browse web via the tunnel. 192.168.2.x = internal network 192.168.3.x = openvpn server 192.168.2.111 = openvpn server on internal network [root@openvpn ~]# ...
1
vote
1answer
24k views

Install 32- or 64-bit Crystal Reports runtime on 64-bit server?

To run, our VB.NET application needs the runtime files Crystal Reports, developer version for Microsoft Visual Studio. (Support Pack SP8) We are installing our application on Windows Server 2012 R2 ...
3
votes
3answers
27k views

Gitlab not working with SSH Keys

I am having issues with Gitlab. I used the following guide to install and configure Gitlab https://github.com/gitlabhq/gitlab-recipes/blob/master/install/centos/README.md. The installation seemed to ...
5
votes
1answer
22k views

Installing Oracle 32bit and 64bit client on the same machine

So I need to have both the 32bit and 64bit clients for Oracle 11g coexist on the same machine. I have installed both together before, but there are many issues where applications that need to use the ...
3
votes
1answer
19k views

How can I recover or restore an Office 365 mailbox of a deleted user?

We have deleted a user account (and subsequently their Exchange Online mailbox) in our Office 365 organization. We didn't feel there was a need to export their Outlook OST contents to a PST file for ...
6
votes
3answers
37k views

How do you apply proxy settings per computer instead of per user?

So far, I've used a user group policy object utilizing Internet Explorer maintenance to set a proxy for the user in IE. We have now deployed the Enterprise Client (EC) starter group policy to our ...
2
votes
3answers
15k views

Administrator can access all mailboxes - how can I stop it?

At our organisation the DOMAIN\Administrator account can access all mailboxes i.e. log in to Outlook Web Access as DOMAIN\Administrator and then open another mailbox and that users mailbox appears. I ...
2
votes
1answer
23k views

Routing from mikrotik two IP addresses to same gateway

I have 2 static addreses (a.b.c.72/24 and a.b.c.128/24) on gateway1 and gateway2 interfaces. ISP have one gateway a.b.c.1 . I can use a.b.c.72 only on gateway1, a.b.c.128 only on gateway2. How to ...
4
votes
3answers
8k views

sendmail can not deliver to gmail - IPv6 sending guidelines regarding PTR records not met

I am having trouble in delivering mail to google from a fresh sendmail install on ubuntu 14.04. The DNS-records seem to be fine for the ip. Something else must be wrong. Sending mail from command ...
16
votes
3answers
15k views

OpenSSH: Difference between internal-sftp and sftp-server

Why are there two ways to setup SFTP with OpenSSH and when to use which? Is there any difference between them? I mean the first one is using a lib from OpenSSH and the second one says "use the ...
7
35
votes
5answers
4k views

Is logging in as a shared user a bad habit?

I've worked in organizations where instead of creating a new Ubuntu user per person that wants to log into a machine, the sysadmins simply add the ssh key of each user to .ssh/authorized_keys, and ...
3
votes
4answers
8k 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 ...
17
votes
2answers
3k views

Why don't NS records contain IP addresses?

The point of an NS record is to tell client which name server will know for sure the actual IP address for a domain name. So for instance, the following query tells you that if you want to get an ...
11
votes
3answers
24k views

Understanding the output of openssl s_client

Ever since our email provider changed their SSL certificate, a POP3 client based on mono refuses to connect to their secure POP server to download emails. Other clients do not have an issue; e.g. ...
5
votes
5answers
34k views

Find out what high CPU usage apache process is actually doing?

Currently having a few issues with our server where, intermittently, we seem to get apache processes which just run and run, taking up 100% CPU. When running top, we see the following: PID USER ...
6
votes
1answer
39k views

Event 36888: The following fatal alert was generated: 10. The internal error state is 1203

I've searched online, but am unable to find any information; why this error is occurring? It has flooded my Event Viewer: with an interval of 1 minute, this Error keeps popping up. (i.e. the ...
4
votes
2answers
23k views

Downgrade IE11 on Windows 2012 Server R2

I have setup a test environment with Windows 2012 Server R2 Std, using RDS/RemoteFX. Anyways, the server is running fine but I need to use IE 10 and not IE 11 on the server itself. I have a web ...
5
votes
1answer
18k views

why adding Expire-Header to static files in nginX does not work

I have a single server block where my site resides in. Inside of that block I've added a location block as below: server { ... location ~* \.(?:ico|css|js|gif|jpe?g|png)$ { expires 30d; ...
1
vote
2answers
19k views

Network drive map through GPO not working on Windows 2012 (Neither via logon script nor drive maps)

Although I thought this would be easy I am unable to automatically connect to a network drive via GPO. I tried through a batch file on (User Configuration / Policies / Windows Settings / Script / ...
1
vote
1answer
14k views

SFTP Error - Couldn't read packet: Connection reset by peer

I try to configure SFTP on Centos 7, on my first server it works perfectly, but on my second server when I try to connect me with : sftp USERNAME@serveripaddress I have this error : Could not read ...
3
2
votes
2answers
8k views

iLO default username always Administrator?

I have noticed that all the HP ProLiant I have access, have the same iLO default username : Administrator. Is it always the same default username ? Some kind of HP internal rule ... (I want to do ...
2
votes
2answers
19k views

Buffer I/O error on device (sata drive)

I keep getting these messages in one of my servers kernel logs (which is responsible for file operations). I wonder if anybody knows how serious are these issues. I cannot use smartmontools because ...
3
votes
2answers
12k views

How to check who reset the password for a particular user in active directory on a windows server?

I have the details about a user account when it was last modified (a password reset was done). But I would be interested to know who reset the password for this user. Is there any way I can find this ...
7
votes
2answers
12k views

Windows Updates taking a long time to install

I manage a WSUS server for a large number of servers in a shared environment. Recently I noticed that despite the scheduled install time configured via the local gpo of many servers, they were not ...
13
votes
1answer
20k views

Windows service trigger start - difference manual vs automatic?

Since Windows Server 2008 R2 (and Windows 7 I think for the client OS) Microsoft has introduced trigger start for services. I do understand difference between automatic, automatic (delayed) and manual ...
0
votes
2answers
18k views

How to install SVN client version 1.8 on CentOS/RHEL 6?

I'm trying to install the SVN client version 1.8 on CentOS 6. I'm using the description on http://tecadmin.net/install-subversion-1-8-on-centos-rhel/ All activities are running successful without ...
5
votes
1answer
17k views

LDAP authentication on CentOS 7

After upgrading to CentOS 7 it's no longer possible to login via LDAP. With CentOS 6 I used the package pam_ldap which worked fine, but now pam_ldap is no longer available for the new version of ...
6
votes
1answer
16k views

How to switch between TLS 1.0 and SSL 3.0 at Java/JRE level?

I am using java 1.6. I have setup my tomcat as my ssl enabled server. And i have setup a ssl enabled client (java code). When i do a communication from my client to server. In java ssl dump in tomcat ...
4
votes
2answers
13k views

Failed to connect to the System Event Notification Service

Several end-users try and log into their Windows 7 machine, they get a message, "failed to connect to the windows notification service" and it goes to a black screen and never actually loads their ...
1
vote
1answer
17k views

504 Gateway timeout / 502 Bad gateway after installing php curl - server nginx

I have (well had) a working server with nginx on board. A server (dedicated) was only used to host a drupal site. Recently we decided to host also a magento store on it and started preparation. Since ...
-1
votes
2answers
17k views

Telnet client on redhat linux

I am trying to install a telnet client in Red hat linux server which doesn't have internet connectivity. Red hat linux version less /etc/redhat-release Red Hat Enterprise Linux Server release 6.4 (...
4
votes
2answers
18k views

Force Windows DHCP to Update DNS for All Current Leases

Is there are way to force Windows 2008R2 DHCP Server to update all DNS entries for all current leases? (Guess the server-side equivalent of ipconfig /registerdns) We had a configuration issue with ...
3
votes
3answers
12k views

Use Script To Edit Local Group Policy Windows Server 2012

I'm hardening a Windows Server 2012 R2 machine for serving secure web pages and following a guide that lays out multiple Local Group Policy Settings and Registry Settings. When researching how to ...
1
vote
3answers
23k views

How to connect an ODBC DSN to nondefault SQL Server instance on default port?

We are migrating an SQL Server 2000 database on one server to SQL Server 2008 R2 on another server. The client application use a User DSN to connect directly to the SQL Server on the internet. I have ...
0
votes
1answer
11k views

Trouble Connecting with Cisco VPN client reason 412

I'm using Windows 8.1 trying to connect to an Office using Cisco VPN. I try to connect and after a few seconds I get this: The Secure VPN connection terminated locally by the client reason 412: ...
0
votes
1answer
6k views

Event ID: 36888 The following fatal alert was generated: 10. The internal error state is 10

We are experiencing the following schannel errors most frequently on our Remote Desktop Terminal Servers. Log Name: System Source: Schannel Date: 11/18/2015 1:04:56 PM Event ID:...
1
vote
2answers
12k views

How to grant Full Access and Send on Behalf permissions in Exchange 2013?

We have migrated from Exchange 2010 to Exchange 2013. We have multiple shared mailboxes and we have always granted users Full Access and Send on Behalf permission so that if a shared mailbox receives ...