diff --git a/install/dist/lib/debian60.lib.php b/install/dist/lib/debian60.lib.php
index 487d3505125941c7d23ad56a958c3b3e616b274b..cc234f132e1fb4a66f4d7e5a1b13866617f4bd88 100644
--- a/install/dist/lib/debian60.lib.php
+++ b/install/dist/lib/debian60.lib.php
@@ -136,6 +136,12 @@ class installer extends installer_base {
 						caselog($command.' &> /dev/null', __FILE__, __LINE__, "EXECUTED: $command", "Failed to execute the command $command");
 					}
 				}
+				//remove #2.3+ comment
+				$content = file_get_contents($config_dir.'/'.$configfile);
+				$content = str_replace('#2.3+','',$content);
+				file_put_contents($config_dir.'/'.$configfile,$content);
+				unset($content);
+				
 			} else {
 				// remove settings which are not supported in Dovecot < 2.3
 				removeLine($config_dir.'/'.$configfile, 'ssl_min_protocol =');
diff --git a/install/dist/lib/fedora.lib.php b/install/dist/lib/fedora.lib.php
index 5bb8fc0d2566b0dbf0006f384580c31131d37b23..3af8746908c796967f118a82f83dffda675667f2 100644
--- a/install/dist/lib/fedora.lib.php
+++ b/install/dist/lib/fedora.lib.php
@@ -449,6 +449,38 @@ class installer_dist extends installer_base {
 				file_put_contents($config_dir.'/'.$configfile,$content);
 				unset($content);
 			}
+			if(version_compare($dovecot_version,2.3) >= 0) {
+				// Remove deprecated setting(s)
+				removeLine($config_dir.'/'.$configfile, 'ssl_protocols =');
+				
+				// Check if we have a dhparams file and if not, create it
+				if(!file_exists('/etc/dovecot/dh.pem')) {
+					swriteln('Creating new DHParams file, this takes several minutes. Do not interrupt the script.');
+					if(file_exists('/var/lib/dovecot/ssl-parameters.dat')) {
+						// convert existing ssl parameters file
+						$command = 'dd if=/var/lib/dovecot/ssl-parameters.dat bs=1 skip=88 | openssl dhparam -inform der > /etc/dovecot/dh.pem';
+						caselog($command.' &> /dev/null', __FILE__, __LINE__, "EXECUTED: $command", "Failed to execute the command $command");
+					} else {
+						/*
+						   Create a new dhparams file. We use 2048 bit only as it simply takes too long
+						   on smaller systems to generate a 4096 bit dh file (> 30 minutes). If you need
+						   a 4096 bit file, create it manually before you install ISPConfig
+						*/
+						$command = 'openssl dhparam -out /etc/dovecot/dh.pem 2048';
+						caselog($command.' &> /dev/null', __FILE__, __LINE__, "EXECUTED: $command", "Failed to execute the command $command");
+					}
+				}
+				//remove #2.3+ comment
+				$content = file_get_contents($config_dir.'/'.$configfile);
+				$content = str_replace('#2.3+','',$content);
+				file_put_contents($config_dir.'/'.$configfile,$content);
+				unset($content);
+				
+			} else {
+				// remove settings which are not supported in Dovecot < 2.3
+				removeLine($config_dir.'/'.$configfile, 'ssl_min_protocol =');
+				removeLine($config_dir.'/'.$configfile, 'ssl_dh =');
+			}
 			replaceLine($config_dir.'/'.$configfile, 'postmaster_address = postmaster@example.com', 'postmaster_address = postmaster@'.$conf['hostname'], 1, 0);
 			replaceLine($config_dir.'/'.$configfile, 'postmaster_address = webmaster@localhost', 'postmaster_address = postmaster@'.$conf['hostname'], 1, 0);
 		} else {
diff --git a/install/lib/installer_base.lib.php b/install/lib/installer_base.lib.php
index 148c6708b898dcb287a56d5746edb7d2f624898a..dd4fe9c306080acb7f08972f20355f91e7b311c4 100644
--- a/install/lib/installer_base.lib.php
+++ b/install/lib/installer_base.lib.php
@@ -1304,6 +1304,38 @@ class installer_base {
 				file_put_contents($config_dir.'/'.$configfile,$content);
 				unset($content);
 			}
+			if(version_compare($dovecot_version,2.3) >= 0) {
+				// Remove deprecated setting(s)
+				removeLine($config_dir.'/'.$configfile, 'ssl_protocols =');
+				
+				// Check if we have a dhparams file and if not, create it
+				if(!file_exists('/etc/dovecot/dh.pem')) {
+					swriteln('Creating new DHParams file, this takes several minutes. Do not interrupt the script.');
+					if(file_exists('/var/lib/dovecot/ssl-parameters.dat')) {
+						// convert existing ssl parameters file
+						$command = 'dd if=/var/lib/dovecot/ssl-parameters.dat bs=1 skip=88 | openssl dhparam -inform der > /etc/dovecot/dh.pem';
+						caselog($command.' &> /dev/null', __FILE__, __LINE__, "EXECUTED: $command", "Failed to execute the command $command");
+					} else {
+						/*
+						   Create a new dhparams file. We use 2048 bit only as it simply takes too long
+						   on smaller systems to generate a 4096 bit dh file (> 30 minutes). If you need
+						   a 4096 bit file, create it manually before you install ISPConfig
+						*/
+						$command = 'openssl dhparam -out /etc/dovecot/dh.pem 2048';
+						caselog($command.' &> /dev/null', __FILE__, __LINE__, "EXECUTED: $command", "Failed to execute the command $command");
+					}
+				}
+				//remove #2.3+ comment
+				$content = file_get_contents($config_dir.'/'.$configfile);
+				$content = str_replace('#2.3+','',$content);
+				file_put_contents($config_dir.'/'.$configfile,$content);
+				unset($content);
+				
+			} else {
+				// remove settings which are not supported in Dovecot < 2.3
+				removeLine($config_dir.'/'.$configfile, 'ssl_min_protocol =');
+				removeLine($config_dir.'/'.$configfile, 'ssl_dh =');
+			}
 		}
 
 		//* dovecot-lmtpd
diff --git a/install/tpl/debian6_dovecot2.conf.master b/install/tpl/debian6_dovecot2.conf.master
index f13bbd53df2bf874d8203f63d3248939a41ae226..74f680024ba26f84db2829c359639531d870256b 100644
--- a/install/tpl/debian6_dovecot2.conf.master
+++ b/install/tpl/debian6_dovecot2.conf.master
@@ -68,3 +68,20 @@ protocol lmtp {
   postmaster_address = webmaster@localhost
   mail_plugins = quota sieve
 }
+
+mail_plugins = $mail_plugins quota
+
+#2.3+ service stats {
+#2.3+     unix_listener stats-reader {
+#2.3+         user = vmail
+#2.3+         group = vmail
+#2.3+         mode = 0660
+#2.3+     }
+#2.3+ 
+#2.3+     unix_listener stats-writer {
+#2.3+         user = vmail
+#2.3+         group = vmail
+#2.3+         mode = 0660
+#2.3+     }
+#2.3+ }
+
diff --git a/install/tpl/debian_dovecot2.conf.master b/install/tpl/debian_dovecot2.conf.master
index 8fdaf44eeb7bc156eb27c43dc113dd182bb21616..cfe3bd018297a88206ca6f2a8854cbb26aae7c55 100644
--- a/install/tpl/debian_dovecot2.conf.master
+++ b/install/tpl/debian_dovecot2.conf.master
@@ -64,4 +64,19 @@ protocol lmtp {
   postmaster_address = webmaster@localhost
   mail_plugins = quota sieve
 }
+
 mail_plugins = $mail_plugins quota
+
+#2.3+ service stats {
+#2.3+     unix_listener stats-reader {
+#2.3+         user = vmail
+#2.3+         group = vmail
+#2.3+         mode = 0660
+#2.3+     }
+#2.3+ 
+#2.3+     unix_listener stats-writer {
+#2.3+         user = vmail
+#2.3+         group = vmail
+#2.3+         mode = 0660
+#2.3+     }
+#2.3+ }
diff --git a/install/tpl/fedora_dovecot2.conf.master b/install/tpl/fedora_dovecot2.conf.master
index c14af1d44d505dbcdf15a00d2e2b471c80a6f3d6..1ba39a30d49c231b3d30b1c0f32ca51aff51b63f 100644
--- a/install/tpl/fedora_dovecot2.conf.master
+++ b/install/tpl/fedora_dovecot2.conf.master
@@ -61,4 +61,19 @@ protocol lmtp {
   postmaster_address = webmaster@localhost
   mail_plugins = quota sieve
 }
+
 mail_plugins = $mail_plugins quota
+
+#2.3+ service stats {
+#2.3+     unix_listener stats-reader {
+#2.3+         user = vmail
+#2.3+         group = vmail
+#2.3+         mode = 0660
+#2.3+     }
+#2.3+ 
+#2.3+     unix_listener stats-writer {
+#2.3+         user = vmail
+#2.3+         group = vmail
+#2.3+         mode = 0660
+#2.3+     }
+#2.3+ }
diff --git a/install/tpl/opensuse_dovecot2.conf.master b/install/tpl/opensuse_dovecot2.conf.master
index f28c1095d2792989b09e64e3fa3f403c2adca09c..f615cf335494ef1307706d9a3a1a55adf6228218 100644
--- a/install/tpl/opensuse_dovecot2.conf.master
+++ b/install/tpl/opensuse_dovecot2.conf.master
@@ -60,4 +60,19 @@ protocol lmtp {
   postmaster_address = webmaster@localhost
   mail_plugins = quota sieve
 }
+
 mail_plugins = $mail_plugins quota
+
+#2.3+ service stats {
+#2.3+     unix_listener stats-reader {
+#2.3+         user = vmail
+#2.3+         group = vmail
+#2.3+         mode = 0660
+#2.3+     }
+#2.3+ 
+#2.3+     unix_listener stats-writer {
+#2.3+         user = vmail
+#2.3+         group = vmail
+#2.3+         mode = 0660
+#2.3+     }
+#2.3+ }