All Questions
18,516
questions
4
votes
1
answer
533
views
Is there a way to make Apache follow symlinks for the header content-type?
If I serve a file named image.jpg the header content-type is sent as image/jpeg, but if I make a softlink named image that points to image.jpg the content-type is sent as text/plain.
Is there a way ...
4
votes
3
answers
191
views
Do mail servers and/or spam filters care about a domain's root A record?
I have a domain which I only use for email adresses. I don't host any content there.
My provider added an initial A record at the root of my domain which points to a server that delivers a ...
4
votes
2
answers
262
views
Does the additional load on UPS in case of grid failure amount to 100%?
The scenario is as follows: Servers are equipped with two PSU's each. One of these is connected to the UPS, the other one directly to the power grid (bypassing the UPS).
I would assume that since the ...
4
votes
2
answers
12k
views
Use Mikrotik as a switch and route subnets through another router
I've got the following network configuration:
Comtrend 5813 FTTH Router, connected to WAN, let's say in 192.168.50.x (being .1 router's address) and a DHCP server active, giving addresses from .150 ...
4
votes
1
answer
1k
views
Get SSH fingerprint from remote server securely?
I had thought about this and my host provides out of band support, so I could simply create the key fingerprint out of band and compare it when connecting to that server from home.
Is there any other ...
4
votes
1
answer
9k
views
Windows 2016 Server on site domain join with Azure AD
My company has their entire user/group architecture in the cloud using Azure. We recently purchased a Windows 2016 Server machine and I have been asked to set it up so that we can use our Azure ...
4
votes
2
answers
8k
views
How to safely backup MySQL using VSS-based backup solutions
One of my clients is running MySQL on a Windows Server 2008 system. Their regular backups are performed using StorageCraft's ShadowCopy, which uses the VSS service to perform backups of open files.
...
4
votes
8
answers
5k
views
Bash can't start a programme that's there and has all the right permissions
This is a gentoo server. There's a programme prog that can't execute. (Yes the execute permission is set)
About the file
$ ls
prog
$ ./prog
bash: ./prog: No such file or directory
$ file prog
prog: ...
4
votes
4
answers
2k
views
DEB: "Provides:" field ignored
I need to replace a package with a custom one, which gets its own name (foo-origpackage). To allow it to be used as drop-in replacement, I added the Provides: origpackage line to the control file. apt-...
4
votes
3
answers
1k
views
Compiling kernel version >= 2.6.34 on CentOS 5: RAID set "ddf1_foo" was not activated?
I want to mount a Ceph FS on some CentOS 5 servers. Since the ceph-fuse failed with below errors:
# ceph-fuse --no-fuse-big-writes -m 192.168.2.15:6789 /mnt/ceph/
ceph-fuse[7528]: starting ceph ...
4
votes
2
answers
9k
views
How Can I Harden the TCP/IP Stack in Windows Server 2008? [duplicate]
I would like to make sure that my Windows 2008 servers are hardened against DDOS attacks.
There is a Microsoft Technet article on Hardening the TCP/IP stack, but it was last revised in January 2006. ...
4
votes
2
answers
16k
views
Enabling REST (GET, POST, PUT, DELETE) support in iis 6
I want to enable REST support in iis 6. My Googling has shown me that i can achieve PUT requests by [enabling WebDav] , however enabling the Delete method still eludes me. I've seen suggestions about ...
4
votes
1
answer
8k
views
For VLANs: difference between untagged and non-member setting for ports?
The "default" VLAN is VLAN 1, and traffic over ports are Untagged by default (at least, in the switches that we use). We've created VLAN 2 and marked the necessary ports as Tagged, and it's working ...
4
votes
3
answers
20k
views
Audit policy being overwritten by "something"
I'm installing vendor software which requires account auditing to be enabled on our DCs. The problem is Audit Policy is not being pushed. Checking secpol.msc shows Windows Settings->Security ...
4
votes
2
answers
3k
views
What are all the possible causes of the "An Active Directory Domain Controller (AD DC) for the domain ..." error message?
Earlier I was having issues connecting one of my workstations (client) to my domain, and I thought it was because the domain was not in my possession yet (reference: this question). But, due to the ...
4
votes
2
answers
5k
views
How do I host 2 different website names at the same IP address?
I'd like to host two websites with different domain names, on a single server, with a single IP address.
I have a fixed IP address with my service provider. It points to my router which port ...
4
votes
1
answer
248
views
Queries passed to SQL Server are getting corrupted
We are experiencing a bizarre error with our application at a customer site. We have managed to narrow it down to the point where we can replicate the behaviour using just Management Studio and SQL ...
4
votes
3
answers
5k
views
iptables: find out what packet is blocked by which rule?
How can I setup iptables in a way I know what packet is blocked by which rule? The one solution I know of is to -j LOG --log-prefix. Is there any other way?
4
votes
1
answer
3k
views
Store session files in different directories in PHP
I have several sites hosted on the same server, in different directories (e.g: server.com/site_one, server.com/site_two) and I want to store the session files for each site in a different directory.
...
4
votes
6
answers
7k
views
How do I reduce RAM usage on my server?
I have recently launched a site that is very popular but I am having trouble with scalability. My site makes heavy use of FFmpeg and at peak times RAM usage hits the 2 GB point quickly and the swap ...
4
votes
3
answers
27k
views
How to move VM to a new Virtual Network in Azure Portal
Can someone let me know how to move a VM from one Virtual Network to another. In the image, I would like to move the VM webtestnic-backend-.... from Virtual network 'webtestvnet-arrmb7u3eu35o to my ...
4
votes
1
answer
20k
views
Fedora 21 pam_sss authentication failure - permission denied
We have configured a OpenLDAP server which is working fine. FreeBSD, Debian, and a WordPress plugin authenticate with no problems. We are configuring Fedora 21 with pam_sss, but we get the following ...
4
votes
1
answer
21k
views
RHEL 6.2 hangs at startup screen after forced reboot
I had to force a hardware reboot due to some CPU hungry application. It now hangs at the start-up screen right after the progress circle completes.
I have no way to see what it is doing (checking the ...
4
votes
4
answers
40k
views
How to mail-enable an existing Azure AD security group?
In a cloud-only Azure AD & Office 365 setup (in other words, no AD DS and no ADConnect), I have several security groups with assigned membership. I would like to mail-enable these.
The users who ...
4
votes
1
answer
4k
views
How do I test my internet connection speed via a Microsoft Windows Terminal?
I currently have two production servers. One running Windows Server 2003 and the other Windows Server 2008. When I open the Reliability and Performance Monitor I see a Network section that only goes ...
4
votes
1
answer
343
views
Real-world impact of partial authoritative DNS outage
Following the Dyn outage on Friday we are considering adding a secondary authoritative DNS provider. We would like to understand the real-world impact should one of the providers have an outage.
For ...
4
votes
2
answers
17k
views
Kerberos authentication through load balancer
I generally understand the problems that a load balancer poses for Kerberos. In fact, Microsoft's KB article outright states that it's not possible. However, this article - also on an MS site - ...
4
votes
3
answers
11k
views
How to force a own set of ciphers in Postfix 2.11?
I would like to force a own set of TLS cipher suites rather than use the Postfix built in ones.
My desired set of ciphers is (taken from nginx configuration):
ECDHE-RSA-AES128-GCM-SHA256:ECDHE-ECDSA-...
4
votes
1
answer
3k
views
Does a growing number of TIME_WAIT connections affect server performance?
I have 2 servers, both running RHEL 6, one for Apache 2.2 and one for memcached (memcached-1.4.4-3).
I noticed an increase in the number of TIME_WAIT connections on the Apache server
netstat -n | ...
4
votes
1
answer
9k
views
vsFTPd and iptables - how to configure them in CentOS 5.5?
I've installed vsFTPd in CentOS 5.5, on two servers, and added this rule to their iptables:
-A RH-Firewall-1-INPUT -m state --state NEW -m tcp -p tcp --dport 21 -j ACCEPT
Looks like this is not ...
4
votes
2
answers
528
views
Nagios alerts using twitter (with twurl) not firing
We've been using nagios for some time and have recently decided to change how we receive alerts. To this end, we've installed twurl ( https://github.com/marcel/twurl ) and are using it to send alerts. ...
4
votes
1
answer
80k
views
Should I care that the "server certificate does NOT include an ID which matches the server name"?
I have the following config:
<VirtualHost 1.2.3.4:443>
ServerName mydomain.com
ServerAlias www.mydomain.com
...
</VirtualHost>
I want www.mydomain.com to be the primary ...
4
votes
1
answer
26k
views
Nginx 404 for css js files
I can't load css and js files on my MAC. I get 404 for those files. on Ubuntu in nginx.conf I just add on the end rewrite ^/assets/([a-z\-]+)-([a-z0-9]+).(css|js) /assets/$1.$3; and it works.
But I ...
4
votes
2
answers
10k
views
fatal: parameter "smtpd_recipient_restrictions" in maillog
I am seeing this in my maillog:
fatal: parameter "smtpd_recipient_restrictions": specify at least one working instance of: check_relay_domains, reject_unauth_destination, reject, defer or ...
4
votes
1
answer
4k
views
I need to monitor a log file with monit if the file does not change monit will alert
I need help. I was looking in to Monit documentation and I need help. I could not find my answer there. I need to monitor a log file of a service, if that log file stops to increase in size or even ...
4
votes
1
answer
4k
views
Systemd python service buffers journalctl output even with -u
I have a simple user systemd service configured like so:
[Unit]
Description=Bot
AssertPathExists=/home/mikel/discord-bot/
[Service]
WorkingDirectory=/home/mikel/discord-bot/
ExecStart=/home/mikel/...
4
votes
1
answer
3k
views
How can I install a custom (patched) PECL extension?
I'm trying to use the htscanner PECL extension on my CentOS 5/PHP 5.2.6 machine, but there's a bug in the latest version where a newline character is added to the end of every php_value directive. ...
4
votes
4
answers
21k
views
Internal and External DNS from Different Servers, Same Zone
I am either having trouble understanding how DNS works, or I am having trouble configuring my DNS correctly (either one isn't good). I am currently working with a domain, I'll call it webdomain.com, ...
4
votes
2
answers
12k
views
Postfix auto create Maildir
I've been beating my head against a wall for a while now on this one. Basically, here is the rundown:
Our MX record points to a frontend SMTP server, which contains aliases for actually routing the ...
4
votes
2
answers
18k
views
Local domain DNS resolution not working using OpenVPN on a pfSense box
I am currently trying to setup an OpenVPN server with the intention of linking several servers together in order to run the backup jobs over the VPN.
For this example, this is what I have:
A pfSense ...
4
votes
3
answers
5k
views
PHP 5.2x on Ubuntu 10.04 Lucid Lynx
It appears that Lucid Lynx comes with PHP 5.3. Is there a convenient way to downgrade to the latest 5.2x release?
4
votes
1
answer
4k
views
Why is sshd engaging PAM still?
Background/Behavior is: if you ssh to box via and GSSAPI/Kerberos succeeds and you have a local user in /etc/passwd, you login fine per below PAM config. All Good there.
But if you don't have a ...
4
votes
5
answers
16k
views
Recovering a specific job definition from an MSDB backup?
We've been asked to recover a specific SQL 2005 job from how it existed at a certain time in the past. We have MSDB database backups from that time period, but I can't overwrite the current MSDB ...
4
votes
6
answers
4k
views
What is causing email sent from my Google Apps account to bounce?
I have started to get Delivery Status Notification (Failure) messages in response to emails sent from my Google Apps domain account (at offby1.net):
Delivery to the following recipient failed ...
4
votes
2
answers
12k
views
opendkim error loading key
I am having a hard time in debugging this error:
Syslog:
Apr 24 06:18:08 abcex opendkim[24223]: abcex: key data is not secure: /etc/opendkim/keys/abcex.private
Apr 24 06:18:08 abcex opendkim[24223]: ...
4
votes
1
answer
2k
views
GCP, basic IPv6 set up for Linux VM Instance
I'm trying to set up a simple VM in Google Cloud Platform that can ping ipv6.google.com successfully. I'm using these GCP docs regarding IPv6 support, including :
https://cloud.google.com/vpc/docs/...
4
votes
3
answers
4k
views
Disable connection tracking with UFW for port 80
During load testing my server is dropping packets due to "connection tracking" way before it's running out of resources. I'm using Ubuntu Jaunty with ufw. In my syslog I get:
ip_conntrack: table full,...
4
votes
3
answers
4k
views
Network link layer equivalent of `ping` to probe a device which fell from the intranet?
Here's my situation. It's hypothetical, but happens often enough to be a problem.
We have a generic layer 2 ethernet network switch. All of the devices connected to this switch use IP addresses in a ...
4
votes
3
answers
3k
views
OpenDKIM permission denied [duplicate]
I have installed opendkim on CentOS 6 and set the TemporaryDirectory to /var/tmp in the opendkim.conf configuration file. After restarting the service and trying to send an email I get an error in the ...
4
votes
2
answers
5k
views
Exchange server can't receive from AOL; MapiExceptionNamedPropsQuotaExceeded
We have Microsoft Standard Exchange 2007. Sometime recently we have suddenly lost the ability to receive emails from AOL. As far as I can tell, we are receiving all other email normally.
The only ...