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30
votes
1answer
2k views

Unexpected and unexplained slow (and unusual) memory performance with Xeon Skylake SMP

We've been testing a server using 2x Xeon Gold 6154 CPUs with a Supermicro X11DPH-I motherboard, and 96GB RAM, and found some very strange performance issues surrounding memory when compared to ...
15
votes
2answers
4k views

MacOS clients sporadically disconnect from WPA Enterprise wireless network

We have a small office with ~20 people, each using a MacBook, and optionally connecting with a mobile phone too. Previously we used usual Wi-Fi with a shared key, but recently I reconfigured it to WPA ...
15
votes
2answers
5k views

KVM guest cannot write to 9p share owned by non-root

I am aiming to set up full write access to a 9p share for a KVM guest. Both host and guest have the same users/groups with the same IDs. Both host and guest should be able to write to the share using ...
14
votes
1answer
985 views

Using defaultAuthenticationType with PowerShell Web Access

PowerShell web access lets you choose the authentication type. By default, it uses a value of Default, which ends up being Negotiate. I have set up CredSSP to allow logging into the PSWA server itself ...
13
votes
1answer
5k views

Is MSIZAP still useful, or is it obsolete?

I update flash using MSI files installed by group policy. However, with every update, about a third of the workstations fail to update (Windows Vista and Windows 7 32/64-bit editions). In the event ...
12
votes
2answers
577 views

Dynamically Authenticate Apache with LDAP Based on Request String?

It is possible to use a portion of the request URI as an input into mod_authnz_ldap's Require ldap-group directive? I'm trying to dynamically check access to a bunch of different project directories, ...
12
votes
1answer
8k views

Parallel Redo Is Shutdown

When looking in Windows event logs, i'm seeing the following messages on an almost continuous basis - Starting up database 'Database'. Parallel redo is started for database 'Database' with worker ...
11
votes
2answers
11k views

Adding second network interface to Ubuntu 18.04 on AWS EC2

The provided 18.04 AMI comes with one interface, and I am adding a second one with its own IP (for stuntman-server). However the instance is only responding to one elastic IP or the other, not both (...
11
votes
1answer
2k views

Where can I find the Dropbox log files?

I am running Dropbox on a Debian server. Once I start Dropbox using python dropbox.py start it stops working after a while and python dropbox.py status reports: Dropbox isn't running! I ...
11
votes
3answers
2k views

vsftpd - PAM - MySQL and pam_mkhomedir to create directories

I've been successfully using vsftpd with virtual users connecting with PAM to my mysql DB. Now I'd like to automate creation of user directories with successful vsftpd connection. Here is /etc/pam.d/...
10
votes
1answer
4k views

“The name limit for the local computer network adapter card was exceeded” error message

Let me start out by stating that I have already searched many sources for information or a resolution, but I have been unable to find a permanent solution. Problem: Randomly, for what appears to be ...
10
votes
0answers
2k views

Android to openswan/xl2tpd/pppd error: result_code_avp: avp is incorrect size. 8 < 10

I am trying to use a simple Android 4.4.4 VPN connection to openswan/xl2tpd/pppd combo. the IPSec SA works, but xl2tpd at one point terminates the pppd and this shows up in logs: xl2tpd[17990]: ...
10
votes
2answers
1k views

Unable to bind OSX 10.9 to Active Directory 2008

I am struggling to bind OSX 10.9 to a 2008 r2 Active Directory. I can join the domain fine when I boot into Windows from the same machine. From OSX I can find the domain controller successfully and ...
10
votes
2answers
1k views

Freebsd change default Internet channel route

I have two Internet channel and Gateway on freebsd. When I switch channel with the command route change default chan2, the command netstat -nr shows changed default route. But traceroute shows that ...
10
votes
1answer
601 views

Firefox dynamic default preference configuration

My users are all on NFS home directories and with hundreds of users all using Firefox it generates a bit of traffic reading/writing to the disk cache. As a result, I'd like to move the default ...
10
votes
1answer
3k views

certutil -ping fails with 30 seconds timeout - what to do?

The certificate store on my Win7 box is constantly hanging. Observe: C:\>1.cmd C:\>certutil -? | findstr /i ping -ping -- Ping Active Directory Certificate Services Request interface ...
10
votes
2answers
8k views

IIS aborts request thread with status 995

We have a site where we have trouble on our production server, but not on my dev machine with request beeing aborted (hence, zero response). It fails after exactly 1:19 minutes each time, and the ...
10
votes
1answer
617 views

AD custom attribute of type numerical string crashes MMC when updated

I am using windows server 2008. I have a domain with one domain controller (this is a dev environment). I edited the AD schema and created a custom attribute called TestAttribute2 (the LDAP name is ...
10
votes
4answers
2k views

yum-security for CentOS?

Last time I checked I was able to install yum-security in CentOS but since it doesn't use the official redhat mirrors I was unable to get it to actually work. Is there a way to make yum-security work ...
9
votes
0answers
217 views

How much does FreeBSD accept_filter actually improve performance in a modern world?

I recently learned about FreeBSD's accept_filter socket option which can allow a worker process to avoid context switching by, for example, waiting until a full HTTP request is received with accf_http:...
9
votes
0answers
374 views

Can Asterisk's phoneprov module be used securely?

I'm using Asterisk 13.1.0 as packaged by Ubuntu Server 16.04 to run a pure-VoIP phone system. Asterisk has a module – phoneprov – that allows it to template out configuration files for ...
9
votes
4answers
293 views

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 ...
9
votes
0answers
3k views

haproxy CD flags with browser, not with curl

Issuing the same url request, from the same workstation to the same haproxy server: with a browser (tried Chrome and Firefox): haproxy log shows CD flags with curl: haproxy log shows -- Both ...
9
votes
2answers
3k views

Containerized PostgreSQL with data on a distributed file system

I am curious if somebody is actually running PostgreSQL in a container in production on some form of distributed file system - GlusterFS preferably, or anything. I am currently running Mesos/Marathon....
9
votes
2answers
2k views

Delegate session management on RemoteApp 2012

We've built a rather large RemoteApp environment on 2012 R2, fully patched. Everything is working fine, so now comes the time to offshore and delegate tasks to the first line team. We would like to ...
9
votes
0answers
5k views

SSH_ORIGINAL_COMMAND variable not getting set

I am working with two servers, both of which run FreeBSD 8.4-RELEASE-p1 and OpenSSH_6.1p1. Both servers' ssh_config files, located in /etc/ssh, are identical. Both servers are configured to allow ...
9
votes
1answer
721 views

Using ZFS head node as database server?

I'm using a dual-head ZFS-backed NAS for high availability cluster shared storage, based on Nexenta's recommended architecture as seen here: The disks in 1 JBOD will store the database files for a ...
9
votes
3answers
9k views

Why am I getting unauthorized errors with Powershell get-winevent?

I'm a domain admin equivalent, I've tried running in an elevated console (right-click> run as administrator), and I'm consistently getting errors when executing get-winevent -logname application | ...
9
votes
1answer
2k views

how to configure IIS 7 so partial content requets/range requests on mp4 static files work.

I need help on how to setup IIS 7 so it can handle partial requests/range requests for serving mp4 files so Chrome can position seek and loop video. From what I have read IIS is supposed to support ...
9
votes
2answers
6k views

Changing physical path on IIS through appcmd isn't activated

We have come across an issue on IIS 7.5 where we have a simple deploy system which consists of the following: Create a zip-file of new webroot, consisting of three folders: Api Site Manager This is ...
9
votes
1answer
2k views

1GB VPS - Apache Worker MPM - FCGID - Max concurrent connections - RAM CAP

I have spent a week or two researching and setting up my server to run Apache with the Worker MPM and FCID. I am trying to optimize it to allow for the most concurrent connections possible. It has ...
9
votes
2answers
2k views

Dynamic ARP Entries turning into Static ARP entries

I recently acquired a client that has a strange ARP caching issue on one of thier servers. I have a server that will eventually start turning it's dynamic ARP entries into static ARP entries. This ...
9
votes
1answer
1k views

Troubleshooting Redmine (Bitnami Stack) performance

I've got a Redmine instance (Bitnami Stack) that's unusually slow. Because I'm just trying to get to the bottom of this, I have some theories which I'd like to discuss here. So, if anybody has any ...
9
votes
1answer
3k views

Is it safe to set validateIntegratedModeConfiguration=false in order to continue using identity impersonate=true?

We have upgraded an ASP.NET web application from IIS6 to IIS7 integrated mode. Our application uses: <identity impersonate="true"/> and therefore we have had to set: <validation ...
9
votes
2answers
287 views

Prompt for user group when logging into OSX domain

When a user is a member of more than one group, when logging in to a 10.6 machine, it shows a prompt asking for what group to apply settings for. We're using the groups to mount different shares, e.g....
9
votes
1answer
2k views

Is it possible to do multiseat the systemd way with one graphic card / two heads?

I would like to setup a multi-seat configuration using Ubuntu Xenial 16.04. After some researches, it seems the way to do now is by systemd through "loginctl" calls. (saw here for example). Before ...
9
votes
3answers
786 views

ip6tables rules are completely ignored inside OpenVZ container

We have set up IPv6 networking on openvz using bridged veth devices. The IPv6 traffic to and from the VEs works fine. ip6tables works on the HN and iptables work on the VE. Inside the VE we can set ...
8
votes
0answers
1k views

Where to get debian mirror status?

The following command fails right now (14:16 in EET timezone): docker run debian:buster apt-get update The error being: $ docker run debian:buster apt-get update Get:2 http://deb.debian.org/debian ...
8
votes
0answers
175 views

What caused a huge amount network traffic via SSH?

I have a virtual server running Ubuntu 18.04 from a well known hosting company. This morning our Fortigate Firewall logs shows that my Win10 computer transferred 3.5TB to and 6.5TB from my virtual ...
8
votes
1answer
179 views

Can Samhain monitor for a file that does not exist, but might in future?

I would like Samhain to monitor a file, say for example, /root/somefile. This file does not currently exist, but I would like to be notified if it gets created at any point. I add this to samhainrc: ...
8
votes
2answers
263 views

what is the IOPS behavior when partitions of single disk are used in an LVM?

I have an ubuntu 14.04.1 LTS server which have LVM(backed by hardware RAID5) with logical volume and a volume group named "dbstore-lv" and "dbstore-vg" which have sdb1 sdb2 sdb3 created from same sdb ...
8
votes
0answers
6k views

Restoring data after zfs destroy

On Debian 8.7 I had a zfs pool. (obviously using ZFS on Linux, not Oracle or Solaris zfs) It was needed to extend ZFS pool from mirror on 2 disks to raidz on 4 disks. I did backup (one copy of data - ...
8
votes
1answer
1k views

CentOS 6 local update repository and security updates

I know that official CentOS 6 (even 7) update repositories does not provide security information. The consequence is thatyum-plugin-security plugin and yum check-update --security command does not ...
8
votes
1answer
7k views

LFTP: certificate common name doesn't match requested host name

Using lftp to upload files to a remote server from two computers on my network. Using the exact same code this works fine on one and doesn't work on the other. Transcripts of a problem session and a ...
8
votes
2answers
1k views

Preloading docker images with an ISO for redistribution

We are developing an app that is to be deployed on site to various installations (not cloud). Our OEM partner is asking us to provide them with an ISO to be able to quickly provision new servers. Our ...
8
votes
2answers
985 views

Replacing windows extra large cursor file with one that is 30% larger (Server 2008 R2)

Currently have a client that has poor eyesight and needs everything on his screen larger than standard. The issue is when running a Citrix application [Xenapp], the mouse is not scaling properly. ...
8
votes
1answer
1k views

Azure AD Connect Password Sync

Windows 2012 R2, fully updated/activated Roles: ADDS, ADFS Installed Azure AD Connect latest version (only software installed other than updates) Other applicable services: Office 365 (Business ...
8
votes
2answers
289 views

Windows 7 contains duplicate, identical builtin print forms (Letter, Legal) but only one of the 2 successfully prints

I have a Windows 7 64-bit machine with a Lexmark E360dn printer. Whenever the user attempts to print anything, the printer defaults to "Letter" size, as expected. When the user clicks PRINT, the ...
8
votes
1answer
5k views

Samba: allow insecure wide links

allow insecure wide links: In normal operation the option wide links which allows the server to follow symlinks outside of a share path is automatically disabled when unix extensions are ...
8
votes
2answers
555 views

Cisco DNS doctoring or Hairpinning?

I've the following configuration: CISCO 881, IOS 15.2(4)M6. On WAN interface is configured the 86.34.156.48/29 subnet from our ISP. Behind the router is staying 2 webserver. NAT: 86.34.156.51 <> ...

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