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34 votes
1 answer
4k 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 ...
16 votes
1 answer
2k 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 ...
  • 2,535
15 votes
0 answers
9k 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 - ...
14 votes
1 answer
6k 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 ...
  • 1,155
14 votes
1 answer
15k 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 ...
12 votes
3 answers
2k 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 ...
  • 121
12 votes
1 answer
6k views

Change Envelope From to match From header in Postfix

I am using Postfix as a gateway for my domain and need it to change or rewrite the Envelope From address to match the From header. For example, the From: header is "joe@domainA.org" and the Envelope ...
  • 255
11 votes
0 answers
6k views

How can a Cognito user initialize TOTP on first login when MFA is required?

I am setting up Amazon Cognito for authentication to use a Kibana instance. I only permit administrators to create users, and I permit only the Cognito User Pool identity provider. When creating the ...
  • 186
11 votes
0 answers
459 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:...
  • 9,061
11 votes
1 answer
1k views

Disable file locks on a read-only Windows File Share

Case On a Windows Server (2012R2 or 2016), I want to configure a file share offering a following functionality some users, publishers group, have a write access to the share; these users are ...
11 votes
0 answers
4k 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 ...
  • 437
11 votes
2 answers
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 ...
  • 111
11 votes
1 answer
4k 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 ...
  • 691
11 votes
2 answers
742 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 ...
  • 3,439
10 votes
2 answers
4k 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....
  • 119
10 votes
2 answers
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 ...
  • 858
10 votes
1 answer
2k 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 ...
  • 201
10 votes
1 answer
4k 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 ...
  • 101
10 votes
2 answers
10k views

IIS aborts request thread with Win32 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 ...
  • 858
10 votes
2 answers
11k views

Create user in gitlab without e-mail?

I'm testing out omnibus gitlab on a local VM. After disabling anonymous signup, I tried adding a new user via the /admin/users/new page. It requires I associate an e-mail with the new user account, ...
10 votes
1 answer
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
1 answer
12k views

How to export Cisco AnyConnect preferences and certificates to another PC

I have two computers (PC and MAC) connected to different organization VPNs. I want to be able to connect from MAC to the same VPNs set on PC. So I need to export VPN list and certificates, etc to my ...
9 votes
0 answers
7k views

cups: HTTP_STATE_WAITING Closing for error 32 (Broken pipe)

On a debian stable I've a network printer connected and shared (epson hp1536dnf): socket://ip:9100 from linux clients I've: ipp://ip/printers/printer1 The logs of server are: D [01/Sep/2017:18:21:...
  • 1,055
9 votes
0 answers
2k 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 ...
  • 5,777
9 votes
0 answers
548 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 ...
  • 371
9 votes
4 answers
475 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 ...
  • 91
9 votes
0 answers
3k views

Docker container crashing ubuntu host

Very unexpected, but briefly if i run a docker container host becomes unresponsive, no in/out, can't ping it, only hard reboot works. DMESG, sys and kernel logs doesn't show anything obvious ...
  • 251
9 votes
1 answer
2k 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 ...
9 votes
2 answers
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 ...
  • 17.8k
9 votes
2 answers
304 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 ...
9 votes
1 answer
2k views

Is it possible to authenticate to Sonatype Nexus via ssh keys

Is it possible to authenticate to Sonatype Nexus via ssh keys or any other method that does not require user password in maven settings.xml? I know there are user generated tokens in Sonatype Nexus ...
9 votes
2 answers
660 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 <> ...
9 votes
0 answers
209 views

Setting up IPv6 ACLs on 3com 5500g to block Router Advertisment messages

Is there a way to set up IPv6 ACLs on 3com 5500g switch to block RA traffic on access ports? I couldn't find settings for setting up any IPv6 ACL. Acording to guides, there should be ipv6 specific ...
  • 101
9 votes
1 answer
5k views

teaming with nmcli: bringing connection down and up again fails

On a centos 7 virtual box, I create a team like this: nmcli connection add type team con-name team0 ifname veteam0 nmcli connection modify team0 team.config roundrobin.conf [root@rhce1 ~]# cat ...
  • 1,195
9 votes
0 answers
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]: ...
  • 870
9 votes
2 answers
16k views

Vagrant not ready for SSH error on VirtualBox and Laravel Homestead

Vagrant Version: 1.6.3 VirtualBox: 4.3.14 Ubuntu 14.04 LTS 64 Bit I have been on this for a pretty good while now and cannot figure this out. I have my public and private keys setup and they work. I ...
9 votes
1 answer
832 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 ...
  • 379
9 votes
0 answers
4k views

Unix nslcd login with sAMAccountName and/or userPrincipalName from Active Directory

I'm trying to setup authentication from Active Directory in FreeBSD 10.0 using nslcd (nss-pam-ldapd-sasl package) and would like to allow both sAMAccountName and userPrincipalName as valid login ...
9 votes
1 answer
3k 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 ...
  • 91
9 votes
2 answers
8k views

OpenLDAP memberOf attribute is not updated after group update

I have an OpenLDAP setup on Debian 7.1, (OpenLDAP 2.4.31), and I am trying to set up the memberof overlay. My configuration is just like I have read at lots of sites throughout the internet, however, ...
  • 191
9 votes
2 answers
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
2 answers
3k views

squid proxy overrides my host header, what can I do?

I have the following problem with squid: Some clients access concurrently 62 servers via a squid proxy. All servers have the same host name (www.example.com) but different public IPs (123.123.123.2 ...
  • 235
9 votes
2 answers
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 ...
  • 126
9 votes
0 answers
590 views

What ZFS file structure to use for zfs-root linux system?

In ZFS, you can build your filesystem hiearchy to include different fs-attributes per filesystem. For insance, compression in one area, no-exec/suid in others, noatime. For example, a HOWTO for ...
  • 241
9 votes
2 answers
943 views

User permission requirements to log into vSphere Client for iPad and vCenter Mobile Access

I was just wondering what the minimum permission requirements for a user for to be able to log into the vSphere Client for iPad and vCenter Mobile Access. The clients are connecting to a plain ESXi ...
  • 99
9 votes
1 answer
9k views

Apache/wsgi "Script timed out before returning headers"

I have a custom Django app that's becoming unresponsive roughly every 5,000 requests. In the apache logs, I see see the following: Apr 13 11:45:07 www3 apache2[27590]: **successful view render here** ...
9 votes
2 answers
293 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....
  • 353
9 votes
3 answers
833 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
0 answers
8k views

LDAP: creating a bind user with limited privileges

I need to bind to an OpenLDAP server to authenticate users, but I don't want this low-privileged or "delegated administrator" to be able to see more attributes than strictly necessary. How do I ...
  • 2,729
8 votes
1 answer
284 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: ...

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