Okay... I'm something of a beginner when it comes to servers, and I'm having some issues with restarting apache on my Debian web server.

I just ran the following:

aptitude install apache2 openssl

Immediately afterwards, I tried to restart apache and got the following error message:

IS-13902:/usr/local/apache2/modules# /etc/init.d/apache restart
httpd: Syntax error on line 55 of /usr/local/apache2/conf/httpd.conf: Cannot load /usr/local/apache2/modules/libphp5.so into server: libidn.so.11: cannot open shared object file: No such file or directory

I ran ldd /usr/local/apache2/modules/libphp5.so and got the following output

linux-gate.so.1 =>  (0xb76f6000)
libcrypt.so.1 => /lib/i686/cmov/libcrypt.so.1 (0xb6d78000)
librt.so.1 => /lib/i686/cmov/librt.so.1 (0xb6d6f000)
libmysqlclient.so.16 => /usr/local/mysql/lib/libmysqlclient.so.16 (0xb6a3d000)
libpng12.so.0 => /usr/lib/libpng12.so.0 (0xb6a19000)
libz.so.1 => /usr/lib/libz.so.1 (0xb6a04000)
libjpeg.so.62 => /usr/lib/libjpeg.so.62 (0xb69e5000)
libm.so.6 => /lib/i686/cmov/libm.so.6 (0xb69bf000)
libdl.so.2 => /lib/i686/cmov/libdl.so.2 (0xb69bb000)
libnsl.so.1 => /lib/i686/cmov/libnsl.so.1 (0xb69a1000)
libcurl.so.4 => /usr/local/lib/libcurl.so.4 (0xb6948000)
libxml2.so.2 => /usr/lib/libxml2.so.2 (0xb680f000)
libc.so.6 => /lib/i686/cmov/libc.so.6 (0xb66b4000)
libpthread.so.0 => /lib/i686/cmov/libpthread.so.0 (0xb669b000)
/lib/ld-linux.so.2 (0xb76f7000)
libidn.so.11 => not found
libssh2.so.1 => not found
libssl.so.0.9.8 => /usr/lib/i686/cmov/libssl.so.0.9.8 (0xb6652000)
libcrypto.so.0.9.8 => /usr/lib/i686/cmov/libcrypto.so.0.9.8 (0xb64ff000)
libldap_r-2.4.so.2 => /usr/lib/libldap_r-2.4.so.2 (0xb64bc000)
liblber-2.4.so.2 => /usr/lib/liblber-2.4.so.2 (0xb64ad000)
libresolv.so.2 => /lib/i686/cmov/libresolv.so.2 (0xb6499000)
libsasl2.so.2 => /usr/lib/libsasl2.so.2 (0xb6482000)
libgnutls.so.26 => /usr/lib/libgnutls.so.26 (0xb63e5000)
libtasn1.so.3 => /usr/lib/libtasn1.so.3 (0xb63d5000)
libgpg-error.so.0 => /usr/lib/libgpg-error.so.0 (0xb63d0000)
libgcrypt.so.11 => /usr/lib/libgcrypt.so.11 (0xb6368000)

Can anyone help?

  • IT looks like your apache2 init script is refering to an old or previously installed version of apache2 (probably from sources). You can easily tell that by the directory structure. /usr/local/apache2/conf/httpd.conf actually should be located in /etc/apache2/apache2.conf . Remove the old apache and then reinstall with --purge :) – wojciechz Aug 23 '12 at 15:26
  • dpkg -l | grep libidn? – quanta Aug 23 '12 at 15:27
  • The problem is that I didn't actually mean to install the new version of apache2. I was just trying to install openssl, but copied and pasted the whole command by accident. Is there any way to reverse this? I have a few key sites already running on this server, so I don't want to take it down for too long! – Philip Bennison Aug 23 '12 at 15:35
  • @quanta The output from that is rc libidn11 1.8+20080606-1 GNU libidn library, implementation of IETF I – Philip Bennison Aug 23 '12 at 15:37

Install libidn11-dev package:

# apt-get install libidn11-dev

and try again.

  • When I run ldd /usr/local/apache2/modules/libphp5.so I still get libssh2.so.1 => not found – Philip Bennison Aug 23 '12 at 15:57
  • I take it I should run dpkg -l | grep libssh2 and then app-get install the relevant package? – Philip Bennison Aug 23 '12 at 15:59
  • Try this apt-get install libssh2-1-dev libssh2-php. – quanta Aug 23 '12 at 16:05
  • I got the following: apt-get install libssh2-1-dev libssh2-php Reading package lists... Done Building dependency tree Reading state information... Done E: Couldn't find package libssh2-php – Philip Bennison Aug 23 '12 at 16:15
  • You can remove the line what call that module on apache2.conf ( line 55 comment it ) or install libssh2 manually libssh2.org that the easy way. Also you can install it whit pecl comand, pecl install ssh2 – Skamasle Sep 20 '13 at 14:35

Your Answer


By clicking "Post Your Answer", you acknowledge that you have read our updated terms of service, privacy policy and cookie policy, and that your continued use of the website is subject to these policies.

Not the answer you're looking for? Browse other questions tagged or ask your own question.