MyTrueHost 
Posted in 
Situation:
If you are getting the following error on Horde webmail interface:
Warning: Failed opening ‘Net/Socket.php’ for inclusion(include_path=’.:/usr/share/pear’) in /usr/share/pear/Net/SMTP.php on line 93
Fatal error: Cannot instantiate non-existent class: net_socket in
/usr/share/pear/Net/SMTP.php on line 95
Solution:
Check if the Pear package Net_Socket is present on the server:
pear list|grep Net_SocketNet_Socket 1.0.8 stable
If not present, install it.
pear install Net_Socket
If it is already present, check if the file Socket.php is present in /usr/share/pear/Net/ folder. Most probably this will be missing.
If so download the package Net_Socket. Extract the tar file and copy the file Socket.php from the package to /usr/share/pear/Net/
wget http://download.pear.php.net/package/Net_Socket-1.0.8.tgztar -xzvf Net_Socket-1.0.8.tgz
cd Net_Socket-1.0.8
cp Socket.php /usr/share/pear/Net/
Check Horde Webmail now.
