Posts Tagged ‘response’

How to check Microsoft IIS webserver version

Monday, July 21st, 2014

Reading Time: 2minutes

If you have to tune some weirdly behaviour Microsoft IIS (Internet Information Services) webserver, the first thing to do is to collect information about the system you're dealing with – get version of installed Windows and check what kind of IIS version is running on the Windows server?

To get the version of installed Windows on the system you just logged in, the quickest way I use is:
 

Start -> My Computer (right mouse button) Properties

check-windows-server-version-screenshot-windows-2003-r2

Run regedit from cmd.exe and go and check value of registry value:

 

HKEY_LOCAL_MACHINE\SOFTWARE\MicrosoftInetStp\VersionString


check-iis-webserver-version-with-windows-registry-screenshot

As you can see in screenshot in this particular case it is IIS version 6.0.

An alternative way to check the IIS version in some cases (if IIS version return is not disabled) is to telnet to webserver:

telnet your-webserver 80
 


Once connected Send:

HEAD / HTTP/1.0


Also on some Windows versions it is possible to check IIS webserver version from Internet Information Services Management Cosnole:

To check IIS version from IIS Manager:

Start (button) -> Control Panel -> Administrative Tools -> "Internet Information Services" IIS Manager

From IIS Manager go to:

Help -> About Microsoft Management Console


Here is a list with most common IIS version output you will get depending on the version of Windows server:

 

Windows NT 3.51 1.0
Windows NT 4 2.0-4.0
Windows Server 2000 5.0
Windows XP Professional 5.1
Windows Server 2003 6.0
Windows Vista 7.0
Windows Server 2008 7.0
Windows Server 2008 R2 7.5
Windows 7 7.5
Windows Server 2012 8.0
Windows 8 8.0
Windows Server 2012 R2 8.5
Windows 8.1 8.5

If you have only an upload FTP access to a Folder served by IIS Webserver – i.e. no access to the Win server running IIS, you can also grasp the IIS version with following .ASP code:
 

<%
response.write(Request.ServerVariables("SERVER_SOFTWARE"))
%>


Save the file as anyfile.asp somewhere in IIS docroot and invoke it in browser.

How to speed up qmail qmail-smtpd response time on QmailRocks Thibs based install

Saturday, October 6th, 2012

Reading Time: 2minutesI have recently installed Qmail following the Updated Debian QmailRocks Thibs Install

The qmail is configured just like Thibs points out the server was configured to a run qmail-smtpd script together with DJB’s Daemontools

I’ve figured out today connecting to the newly install Qmail host with telnet, using:


qmail:~# telnet mail.qmailhost.com 25
Trying 83.228.93.76...
Connected to mail.qmailhost.com.
Escape character is '^]'.
220 This is Mail mail.qmailhost.com ESMTP

Does a few seconds delay until my configured qmail greeting shows up. This is not a a deadly problem, but the delay itself might have a negative influence and make the host look like a spammer host to someone, hence I took few seconds to find a way to reduce this SMTP port connection delay.

The mail server responds on port 25, using qmail-smtpd so it was logical delay is caused somewhere by /service/qmail-smtpd/run (which actually links to /var/qmail/supervise/qmail-smtpd/run).

I did a quick review of /var/qmail/supervise/qmail-smtpd/run and found two lines that possibly create unnecessery delay, cause on each and every Port 25 connection request from repote SMTP server /usr/bin/head and /usr/bin/which are executed.
Here are two lines in /service/qmail-smtpd/run, I refer to:


LOCAL=`head -1 $VQ/control/me

(located on line 34)

and


TRUE=`which true`

located on line 116

The script was smartly written as planned to run on multiple Linux distributions. However since QmailRocks Thibs guide and my particular case needs to run on Debian Linux I think this is totally waste of system CPU time.

Therefore I substituted above two lines with:


LOCAL="/var/qmail/control/me"


TRUE="/bin/true"

I checked in /var/qmail/control/me I have only my primary mail server host defined, cause otherwise this changed could pose random mail server errors:


qmail:~# wc -l /var/qmail/control/me
1 /var/qmail/control/me
qmail:~# cat /var/qmail/control/me
mail.qmailhost.com

An updated version of /service/qmail-smtpd/run script you can download from here

If you don’t want to temper manually edit the script the quickest way is to overwrite old script with changed one, i.e.:


qmail:~# cd /var/qmail/supervise/qmail-smtpd
qmail:/var/qmail/supervise/qmail-smtpd# wget -q https://pc-freak.net/files/qmail-smtpd-daemontools-run
qmail:/var/qmail/supervise/qmail-smtpd# mv qmail-smtpd-daemontools-run run

To test connection time delay afterwards, you can use:


# time (echo HELO localhost | telnet mail.qmailhost.com 25)
Trying 83.228.93.76...
Connected to mail.qmailhost.com.
Escape character is '^]'.
Connection closed by foreign host.
real 0m0.070s
user 0m0.004s
sys 0m0.000s

Well still there is a connection delay – it is not so quick as smtp.gmail.com, but now connection response delay is better. For sake of comparison here is same test with Google’s SMTP:


$ time (echo HELO localhost | telnet smtp.gmail.com 25)
Trying 173.194.70.108...
Connected to gmail-smtp-msa.l.google.com.
Escape character is '^]'.
Connection closed by foreign host.
real 0m0.017s
user 0m0.004s
sys 0m0.000s

BTW a bit of time delay sometimes, can have a positive impact against spammers, as it can reduce a bit the amount of spammer mail servers connecting to the host. So i’m not sure if being 4 times slower in connection than Gmail is necessery bad 🙂

Installing HTOP on CentOS 5.5 OpenVZ Linux server from source

Friday, July 22nd, 2011

Reading Time: < 1minute
Htop Cool picture logo / htop on CentOS OpenVZ

Lately, I’m basicly using htop‘s nice colourful advanced Linux top command frontend in almost every server I manage, therefore I’ve almost abondoned top usage these days and in that reason I wanted to have htop installed on few of the OpenVZ CentOS 5.5 Linux servers at work.

I looked online but unfortunately I couldn’t find any rpm pre-built binary packages. The source rpm package I tried to build from dag wieers repository failed as well, so finally I went further and decided to install htop from source

Here is how I did it:

1. Install gcc and glibc-devel prerequired rpm packages

[root@centos ~]# yum install gcc glibc-devel

2. Download htop and compile from source

[root@centos src]# cd /usr/local/src
[root@centos src]# wget "http://sourceforge.net/projects/htop/files/htop/0.9/htop-0.9.tar.gz/download"
Connecting to heanet.dl.sourceforge.net|193.1.193.66|:80... connected.
HTTP request sent, awaiting response... 200 OK
Length: 418767 (409K) [application/x-gzip]
Saving to: "download"

100%[======================================>] 418,767 417K/s in 1.0s
2011-07-22 13:30:28 (417 KB/s) – “download” saved [418767/418767]

[root@centos src]# mv download htop.tar.gz
[root@centos src]# tar -zxf htop.tar.gz
[root@centos src]# cd htop-0.9
[root@centos htop-0.9]# ./configure && make && make install

make install should install htop to /usr/local/bin/htop

That’s all folks! , now my OpenVZ CentOS server is equipped with the nifty htop tool 😉