TLS/SSL ftps hangs during directory listing (cpanel server)

August 3rd, 2015

How to enable passive mode and allow ssl/tls ftps on cpanel work with csf firewall?

1. Add Passive Port range 30000-350000 to your Pureftp or Proftp configuration file

(i) Pureftpd

open /etc/pure-ftpd.conf, and this line

PassivePortRange    30000 35000

(ii) ProFTP

Open /etc/proftpd.conf, and add this line

PassivePorts    30000 35000

2.  Open the ports from 30000 – 35000 in your CSF firewall configuration file under TCP_IN

Open /etc/csf/csf.conf

# Allow incoming TCP ports
TCP_IN = "20,21,22,25,53,80,110,30000:35000"

Then restart firewall and ftp server.

service csf restart
service pureftpd restart (or)
service proftpd restart

Once this is done, open your ftp client and try connecting to ftp server. It should be able to work in passive mode and does not hand during MLSD directory listing.


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SCP: Command Not Found

April 26th, 2015

While I was working on new CentOS box for my new load balancing project I received message saying “SCP: Command Not Found” and my vague memory could not remembered what is the cause. After few minutes I found out that scp is part of openssh-clients package so I had to install it via:

yum install openssh-clients -y

This did the magic and I was then be able to scp to/from the box.

Maybe handy for you with lousy memory like me :-)


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su: cannot set user id: Resource temporarily unavailable

January 16th, 2015

Do you have openvz or virtuozzo container and often you see this error message when trying to su to root?

# su –
Password:
su: cannot set user id: Resource temporarily unavailable

Solution is simple, you need to increase limits in /etc/security/limits.conf

These values work fine

*          soft     nproc          2047
*          hard     nproc          16384
*          soft     nofile         1024
*          hard     nofile         65536

Enjoy! :-)


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Annoying window resize in Putty with Centos 6 and screen

September 29th, 2013

Hello guys,

long time no update. I’ve been busy, but now I’m back and ready to publish few more helpful articles. Today it is about annoying Putty window re-size when you during active ssh session to CentOS 6 server enter ‘screen’.  It gets resized and disturbs your mindful thoughts :-) At least it does that to me and I hate it.

The solution is to edit /etc/screenrc and add this line:

termcapinfo xterm* 'is=\E[r\E[m\E[2J\E[H\E[?7h\E[?1;4;6l'

This fixes it and it will no longer resize putty window. Enjoy ! :-)


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Can’t log in into cPanel after 11.32.2 b15 update

April 6th, 2012

Maybe you also had experienced the situation where you could not log in into cPanel after the recent upgrade to 11.32.15 version. I had the same problem but fixed it with help of cPanel support staff. Here is what the error is and how to solve it..
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Cannot update perl – conflict packages with 32bit version

March 28th, 2012

Today I could not update my perl packages on 64bit Centos because they were conflicting with 32bit version of perl packages
I’m sure you’ve experienced it some day, the error message looks like this:

Transaction Check Error:
file /usr/lib/perl5/5.8.8/CGI.pm from install of perl-5.8.8-32.el5_7.6.x86_64 conflicts with file from package perl-5.8.8-32.el5_6.3.i386

After some investigation I found out that the problem lies in installed 32bit version but distribution want to update 64bit version. Some packages in yum update are asking for the 64bit version and that results in such conflict.

The solution is very simple – just delete 32bit perl and install perl 64bit from scratch using these commands:

yum remove perl.i386
yum install perl

Enkjoy! :-)

 


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Suhosin does not support php 5.2 on Cpanel/WHM server

March 5th, 2012

Few days ago I was surprised that many error messages started to flood my logs on couple of Cpanel/WHM server where I use php 5.2.17. The error was the following:

[05-Mar-2012 18:18:59] PHP Warning: PHP Startup: Suhosin Extension
does not officially support PHP 5.2 and below anymore, because it is
discontinued. Use it at your own risk. in Unknown on line 0

However, bad situation but I have a fix..

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How to measure IO performance on virtual server

March 5th, 2012

Virtual servers are good and very popular during recent years. However, their main bottleneck is IO operations. Slow hdd storage can ruin your vps even when you have enouch RAM and CPU power. I myself have few vpses around the world and show you what I measured so far and how to measure it using ioping.

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Perl update conflict in yum

January 13th, 2012

Have you ever had problem updating perl via yum and yum spitting a conflict error message at you?  I’ve met this problem on few CentOS 5 boxes of mine and thought I share the solution.

I happens on 64bit boxes and the error is for example like this

file /usr/share/man/man1/splain.1.gz from install of perl-5.8.8-32.el5_7.6.x86_64 conflicts with file from package perl-5.8.8-32.el5_6.3.i386
file /usr/share/man/man1/xsubpp.1.gz from install of perl-5.8.8-32.el5_7.6.x86_64 conflicts with file from package perl-5.8.8-32.el5_6.3.i386
file /usr/share/man/man3/CGI.3pm.gz from install of perl-5.8.8-32.el5_7.6.x86_64 conflicts with file from package perl-5.8.8-32.el5_6.3.i386

Obviously it is a problem of having a i386 version along the 64bit. First you need to remove the i386 version and then install perl again. You can do it by executing this command:

yum -y remove perl.i386 && yum -y install perl

It should work and you end up with a correct installation of perl. Until the next update 😉

 


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Roccat Kone+ firmware upgrade problem (Solved!)

November 11th, 2011

Recently I have fallen for Battlefield 3 and this game forced me to buy a new gaming mouse. :-) Early x-mas 😉  I decided to buy Roccat Kone+ and was surprised this mouse has upgradable firmware. The one I purchased had old fw so I decided to upgrade it.. However, it did not work and I did many attempts, turned on/off antivirus, and all other software that could block the upgrade process. Then I was advised to try older version of drivers and then try the latest one and this procedure worked… therefore I bring you step by step instructions how to upgrade driver and firmware on your Roccat Kone+ mouse..

Only in case the regular procedure with latest drivers ( 1.49/1.45 ) doesn’t work, please go ahead with the following workaround!

1.)     Uninstall the driver completely
2.)     Install the driver “1.45/1.40”
http://www.roccat.org/Support/Gaming-Mice/ROCCAT-Kone-/

<<<In case the firmware update should not start automatically, do the following steps (otherwise skip step 3+4 and go ahead with 5!)>>>

3.)     Go to your C:\Programs\ROCCAT\Kone[+] Mouse\FWupdate
4.)     Execute the Kone[+] Firmware Updater.exe

5.)     Now uninstall the driver 1.45/1.40 again.
6.)     Finally install the most recent driver 1.49/1.45
http://www.roccat.org/Support/Gaming-Mice/ROCCAT-Kone-/

This worked for me and it is the official procedure that Roccat advises. Feel free to leave comments if this worked for you too! Enjoy gaming with this great mouse.


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