diff --git a/composer.json b/composer.json
index 657b2ea0..46c7356b 100755
--- a/composer.json
+++ b/composer.json
@@ -6,7 +6,7 @@
   "description" : "FTP protocol support for the XP Framework",
   "keywords": ["module", "xp"],
   "require" : {
-    "xp-framework/core": "^12.0 | ^11.0 | ^10.0",
+    "xp-framework/core": "^12.11 | ^11.11",
     "xp-framework/logging": "^11.0 | ^10.0 | ^9.1",
     "xp-framework/networking": "^11.0 | ^10.0 | ^9.3",
     "xp-framework/io-collections": "^10.0 | ^9.0 | ^8.0",
diff --git a/src/main/php/peer/ftp/FtpConnection.class.php b/src/main/php/peer/ftp/FtpConnection.class.php
index 07774f4f..37137ed1 100755
--- a/src/main/php/peer/ftp/FtpConnection.class.php
+++ b/src/main/php/peer/ftp/FtpConnection.class.php
@@ -268,7 +268,7 @@ public function expect($r, $codes) {
    * @param   string name the directory's name
    * @param   string options default NULL
    * @return  string[] list or NULL if nothing can be found
-   * @throws  io.IOException
+   * @throws  io.OperationFailed
    */
   public function listingOf($name, $options= null) {
     with ($transfer= $this->transferSocket()); {
@@ -293,7 +293,7 @@ public function listingOf($name, $options= null) {
         }
       } else {                      // Unexpected response
         $transfer->close();
-        throw new \io\IOException('Listing '.$this->name.$name.' failed ('.$code.': '.$message.')');
+        throw new \io\OperationFailed('Listing '.$this->name.$name.' failed ('.$code.': '.$message.')');
       }
     }
   }
diff --git a/src/main/php/peer/ftp/FtpDir.class.php b/src/main/php/peer/ftp/FtpDir.class.php
index 0d7cb74f..0a26e02d 100755
--- a/src/main/php/peer/ftp/FtpDir.class.php
+++ b/src/main/php/peer/ftp/FtpDir.class.php
@@ -1,6 +1,6 @@
 <?php namespace peer\ftp;
 
-use io\{FileNotFoundException, IOException};
+use io\{NotFound, OperationFailed};
 use peer\ProtocolException;
 use util\Objects;
 
@@ -33,11 +33,11 @@ public function isFolder(): bool { return true; }
    * Returns a list of entries
    *
    * @return  peer.ftp.FtpEntryList
-   * @throws  io.IOException in case of an I/O error
+   * @throws  io.OperationFailed in case of an I/O error
    */
   public function entries() {
     if (null === ($list= $this->connection->listingOf($this->name, '-al'))) {
-      throw new IOException('Cannot list "'.$this->name.'"');
+      throw new OperationFailed('Cannot list "'.$this->name.'"');
     }
     
     return new FtpEntryList($list, $this->connection, $this->name);
@@ -46,7 +46,7 @@ public function entries() {
   /**
    * Delete this entry
    *
-   * @throws  io.IOException in case of an I/O error
+   * @throws  io.OperationFailed in case of an I/O error
    */
   public function delete() {
     $this->connection->expect($this->connection->sendCommand('RMD %s', $this->name), [250]);
@@ -57,7 +57,7 @@ public function delete() {
    *
    * @param   string name
    * @return  peer.ftp.FtpEntry entry or NULL if nothing was found
-   * @throws  io.IOException in case listing fails
+   * @throws  io.OperationFailed in case listing fails
    * @throws  peer.ProtocolException in case listing yields an unexpected result
    */
   protected function findEntry($name) {
@@ -110,12 +110,12 @@ public function hasFile($name) {
    *
    * @param   string name
    * @return  peer.ftp.FtpFile the instance
-   * @throws  io.FileNotFoundException in case the file was not found
+   * @throws  io.NotFound in case the file was not found
    * @throws  lang.IllegalStateException in case the file exists but is a directory
    */
   public function getFile($name) {
     if (!($e= $this->findEntry($name))) {
-      throw new FileNotFoundException('File "'.$name.'" not found');
+      throw new NotFound('File "'.$name.'" not found');
     } else if ($e instanceof FtpDir) {
       throw new \lang\IllegalStateException('File "'.$name.'" is a directory');
     }
@@ -180,12 +180,12 @@ public function hasDir($name) {
    *
    * @param   string name
    * @return  peer.ftp.FtpDir the instance
-   * @throws  io.FileNotFoundException in case the directory was not found
+   * @throws  io.NotFound in case the directory was not found
    * @throws  lang.IllegalStateException in case the directory exists but is a file
    */
   public function getDir($name) {
     if (!($e= $this->findEntry($name))) {
-      throw new FileNotFoundException('Directory "'.$name.'" not found');
+      throw new NotFound('Directory "'.$name.'" not found');
     } else if ($e instanceof FtpFile) {
       throw new \lang\IllegalStateException('Directory "'.$name.'" is a file');
     }
@@ -196,7 +196,7 @@ public function getDir($name) {
    * Create a new directory
    *
    * @param   string name
-   * @throws  io.IOException if directory cannot be created
+   * @throws  io.OperationFailed if directory cannot be created
    * @throws  peer.ProtocolException in case the created directory cannot be located or is a file
    */
   protected function makeDir($name) {
@@ -217,7 +217,7 @@ protected function makeDir($name) {
    * @param   string name
    * @return  peer.ftp.FtpDir the created instance
    * @throws  lang.IllegalStateException in case the directory already exists
-   * @throws  io.IOException in case the directory could not be created
+   * @throws  io.OperationFailed in case the directory could not be created
    */
   public function newDir($name) {
     if ($e= $this->findEntry($name)) {
@@ -238,7 +238,7 @@ public function newDir($name) {
    * @param   string name
    * @return  peer.ftp.FtpDir the instance
    * @throws  lang.IllegalStateException in case the directory exists and is a file
-   * @throws  io.IOException in case the directory could not be created
+   * @throws  io.OperationFailed in case the directory could not be created
    */
   public function dir($name) {
     if (!($e= $this->findEntry($name))) {
diff --git a/src/main/php/peer/ftp/FtpDownload.class.php b/src/main/php/peer/ftp/FtpDownload.class.php
index c118d2bb..00573795 100755
--- a/src/main/php/peer/ftp/FtpDownload.class.php
+++ b/src/main/php/peer/ftp/FtpDownload.class.php
@@ -66,7 +66,7 @@ public function size() {
   protected function doTransfer() {
     try {
       $chunk= $this->socket->readBinary();
-    } catch (\io\IOException $e) {
+    } catch (\io\OperationFailed $e) {
       $this->listener && $this->listener->failed($this, $e);
       $this->close();
       throw $e;
@@ -81,7 +81,7 @@ protected function doTransfer() {
 
     try {
       $this->out->write($chunk);
-    } catch (\io\IOException $e) {
+    } catch (\io\OperationFailed $e) {
       $this->listener && $this->listener->failed($this, $e);
       $this->close();
       throw $e;
diff --git a/src/main/php/peer/ftp/FtpEntry.class.php b/src/main/php/peer/ftp/FtpEntry.class.php
index c76e1ee8..f522919b 100755
--- a/src/main/php/peer/ftp/FtpEntry.class.php
+++ b/src/main/php/peer/ftp/FtpEntry.class.php
@@ -45,7 +45,7 @@ public function getConnection() { return $this->connection; }
    * Checks whether this entry exists.
    *
    * @return  bool TRUE if the file exists, FALSE otherwise
-   * @throws  io.IOException in case of an I/O error
+   * @throws  io.OperationFailed in case of an I/O error
    */
   public function exists() {
     $r= $this->connection->sendCommand('SIZE %s', $this->name);
@@ -73,7 +73,7 @@ public function exists() {
    * </ul>
    *
    * @param   string to the new name
-   * @throws  io.IOException in case of an I/O error
+   * @throws  io.OperationFailed in case of an I/O error
    */
   public function rename($to) {
     $target= ('/' === $to[0] ? $to : dirname($this->name).'/'.$to);
@@ -81,7 +81,7 @@ public function rename($to) {
       $this->connection->expect($this->connection->sendCommand('RNFR %s', $this->name), [350]);
       $this->connection->expect($this->connection->sendCommand('RNTO %s', $target), [250]);
     } catch (\peer\ProtocolException $e) {
-      throw new \io\IOException('Could not rename '.$this->name.' to '.$to.': '.$e->getMessage());
+      throw new \io\OperationFailed('Could not rename '.$this->name.' to '.$to.': '.$e->getMessage());
     }
   }
 
@@ -90,7 +90,7 @@ public function rename($to) {
    *
    * @param   peer.ftp.FtpDir to the new location
    * @param   string name default NULL the new name - if omitted, will stay the same
-   * @throws  io.IOException in case of an I/O error
+   * @throws  io.OperationFailed in case of an I/O error
    */
   public function moveTo(FtpDir $to, $name= null) {
     try {
@@ -101,7 +101,7 @@ public function moveTo(FtpDir $to, $name= null) {
         $name ? $name : basename($this->name)
       ), [250]);
     } catch (\peer\ProtocolException $e) {
-      throw new \io\IOException('Could not rename '.$this->name.' to '.$to->getName().': '.$e->getMessage());
+      throw new \io\OperationFailed('Could not rename '.$this->name.' to '.$to->getName().': '.$e->getMessage());
     }
   }
 
@@ -109,7 +109,7 @@ public function moveTo(FtpDir $to, $name= null) {
    * Change this entry's permissions
    *
    * @param   int to the new permissions
-   * @throws  io.IOException in case of an I/O error
+   * @throws  io.OperationFailed in case of an I/O error
    */
   public function changePermissions($to) {
     $this->connection->expect($this->connection->sendCommand('SITE CHMOD %s %d', $this->name, $to));
@@ -118,7 +118,7 @@ public function changePermissions($to) {
   /**
    * Delete this entry
    *
-   * @throws  io.IOException in case of an I/O error
+   * @throws  io.OperationFailed in case of an I/O error
    */
   public abstract function delete();
 
@@ -253,7 +253,7 @@ public function getDate() {
    * Get last modified date. Uses the "MDTM" command internally.
    *
    * @return  util.Date or NULL if the server does not support this
-   * @throws  io.IOException in case the connection is closed
+   * @throws  io.OperationFailed in case the connection is closed
    */
   public function lastModified() {
     $r= $this->connection->sendCommand('MDTM %s', $this->name);
diff --git a/src/main/php/peer/ftp/FtpFile.class.php b/src/main/php/peer/ftp/FtpFile.class.php
index 17f01331..c6497b49 100755
--- a/src/main/php/peer/ftp/FtpFile.class.php
+++ b/src/main/php/peer/ftp/FtpFile.class.php
@@ -15,7 +15,7 @@ public function isFile(): bool { return true; }
   /**
    * Delete this entry
    *
-   * @throws  io.IOException in case of an I/O error
+   * @throws  io.OperationFailed in case of an I/O error
    */
   public function delete() {
     $this->connection->expect($this->connection->sendCommand('DELE %s', $this->name), [250]);
diff --git a/src/main/php/peer/ftp/FtpUpload.class.php b/src/main/php/peer/ftp/FtpUpload.class.php
index 443bab81..19d53e01 100755
--- a/src/main/php/peer/ftp/FtpUpload.class.php
+++ b/src/main/php/peer/ftp/FtpUpload.class.php
@@ -1,7 +1,7 @@
 <?php namespace peer\ftp;
 
 use io\streams\InputStream;
-use io\{Channel, IOException};
+use io\{Channel, OperationFailed};
 use lang\IllegalArgumentException;
 
 /**
@@ -76,7 +76,7 @@ protected function doTransfer() {
     try {
       $chunk= $this->in->read(8192);
       $this->socket->write($chunk);
-    } catch (IOException $e) {
+    } catch (OperationFailed $e) {
       $this->listener && $this->listener->failed($this, $e);
       $this->close();
       throw $e;
diff --git a/src/main/php/peer/ftp/collections/FtpCollection.class.php b/src/main/php/peer/ftp/collections/FtpCollection.class.php
index 10d71a6e..c77a2790 100755
--- a/src/main/php/peer/ftp/collections/FtpCollection.class.php
+++ b/src/main/php/peer/ftp/collections/FtpCollection.class.php
@@ -171,19 +171,19 @@ public function setOrigin(IOCollection $origin) {
    * Gets input stream to read from this element
    *
    * @return  io.streams.InputStream
-   * @throws  io.IOException
+   * @throws  io.OperationFailed
    */
   public function getInputStream() {
-    throw new \io\IOException('Cannot read from a directory');
+    throw new \io\OperationFailed('Cannot read from a directory');
   }
 
   /**
    * Gets output stream to read from this element
    *
    * @return  io.streams.OutputStream
-   * @throws  io.IOException
+   * @throws  io.OperationFailed
    */
   public function getOutputStream() {
-    throw new \io\IOException('Cannot write to a directory');
+    throw new \io\OperationFailed('Cannot write to a directory');
   }
 } 
\ No newline at end of file
diff --git a/src/main/php/peer/ftp/collections/FtpElement.class.php b/src/main/php/peer/ftp/collections/FtpElement.class.php
index 13f41e20..0e88902b 100755
--- a/src/main/php/peer/ftp/collections/FtpElement.class.php
+++ b/src/main/php/peer/ftp/collections/FtpElement.class.php
@@ -109,7 +109,7 @@ public function setOrigin(\io\collections\IOCollection $origin) {
    * Gets input stream to read from this element
    *
    * @return  io.streams.InputStream
-   * @throws  io.IOException
+   * @throws  io.OperationFailed
    */
   public function getInputStream() {
     return new FtpInputStream($this->file);
@@ -119,7 +119,7 @@ public function getInputStream() {
    * Gets output stream to read from this element
    *
    * @return  io.streams.OutputStream
-   * @throws  io.IOException
+   * @throws  io.OperationFailed
    */
   public function getOutputStream() {
     return new FtpOutputStream($this->file);
diff --git a/src/main/php/peer/ftp/server/FtpProtocol.class.php b/src/main/php/peer/ftp/server/FtpProtocol.class.php
index 2e10acec..914eddba 100755
--- a/src/main/php/peer/ftp/server/FtpProtocol.class.php
+++ b/src/main/php/peer/ftp/server/FtpProtocol.class.php
@@ -152,7 +152,7 @@ public function eol($type) {
    * @param   string text
    * @param   array lines default NULL lines of a multiline response
    * @return  int number of bytes written
-   * @throws  io.IOException
+   * @throws  io.OperationFailed
    */
   public function answer($sock, $code, $text, $lines= null) {
     if (is_array($lines)) {
@@ -745,7 +745,7 @@ public function onDele($socket, $params) {
 
     try {
       $entry->delete();
-    } catch (\io\IOException $e) {
+    } catch (\io\OperationFailed $e) {
       $this->answer($socket, 450, $params.': ', $e->getMessage());
       return;
     }
@@ -927,7 +927,7 @@ public function onPasv($socket, $params) {
         $this->datasock[$key]->create();
         $this->datasock[$key]->bind();
         $this->datasock[$key]->listen();
-      } catch (\io\IOException $e) {
+      } catch (\io\OperationFailed $e) {
         $this->answer($socket, 425, 'Cannot open passive connection '.$e->getMessage());
         unset($this->datasock[$key]);
         return;
diff --git a/src/main/php/peer/ftp/server/storage/FilesystemStorage.class.php b/src/main/php/peer/ftp/server/storage/FilesystemStorage.class.php
index 1639e40d..d63bb910 100755
--- a/src/main/php/peer/ftp/server/storage/FilesystemStorage.class.php
+++ b/src/main/php/peer/ftp/server/storage/FilesystemStorage.class.php
@@ -74,7 +74,7 @@ public function realname($clientId, $uri) {
    */
   public function setBase($clientId, $uri= null) {
     if (!is_dir($path= $this->realname($clientId, $uri))) {
-      throw new \io\IOException($uri.': not a directory');
+      throw new \io\OperationFailed($uri.': not a directory');
     }
     $this->base[$clientId]= DIRECTORY_SEPARATOR.ltrim(
       str_replace($this->root, '', $path),
@@ -134,13 +134,13 @@ public function create($clientId, $uri, $type) {
     switch ($type) {
       case ST_ELEMENT:
         if (false === touch($path)) {
-          throw new \io\IOException('File '.$path.' could not be created');
+          throw new \io\OperationFailed('File '.$path.' could not be created');
         }
         break;
       
       case ST_COLLECTION:
         if (false === mkdir($path)) {
-          throw new \io\IOException($path.' could not be created');
+          throw new \io\OperationFailed($path.' could not be created');
         }
         break;
     }
diff --git a/src/test/php/peer/ftp/unittest/IntegrationTest.class.php b/src/test/php/peer/ftp/unittest/IntegrationTest.class.php
index 6396f613..8a132471 100755
--- a/src/test/php/peer/ftp/unittest/IntegrationTest.class.php
+++ b/src/test/php/peer/ftp/unittest/IntegrationTest.class.php
@@ -1,7 +1,7 @@
 <?php namespace peer\ftp\unittest;
 
 use io\streams\{MemoryInputStream, MemoryOutputStream, Streams};
-use io\{FileNotFoundException, IOException, TempFile};
+use io\{NotFound, OperationFailed, TempFile};
 use lang\{IllegalStateException, Throwable};
 use peer\AuthenticationException;
 use peer\ftp\{FtpConnection, FtpDir, FtpEntry, FtpEntryList, FtpFile};
@@ -171,7 +171,7 @@ public function nonExistantDir() {
     Assert::false($conn->rootDir()->hasDir(':DOES_NOT_EXIST'));
   }
 
-  #[Test, Expect(FileNotFoundException::class)]
+  #[Test, Expect(NotFound::class)]
   public function getNonExistantDir() {
     $conn= $this->connection()->connect();
     $conn->rootDir()->getDir(':DOES_NOT_EXIST');
@@ -207,7 +207,7 @@ public function nonExistantFile() {
     Assert::false($conn->rootDir()->getDir('htdocs')->hasFile(':DOES_NOT_EXIST'));
   }
 
-  #[Test, Expect(FileNotFoundException::class)]
+  #[Test, Expect(NotFound::class)]
   public function getNonExistantFile() {
     $conn= $this->connection()->connect();
     $conn->rootDir()->getDir('htdocs')->getFile(':DOES_NOT_EXIST');
@@ -329,7 +329,7 @@ public function consecutive_inputstream_reads() {
       try {
         $s= $dir->getFile('index.html')->in();
         Assert::equals("<html/>\n", Streams::readAll($s));
-      } catch (IOException $e) {
+      } catch (OperationFailed $e) {
         $this->fail('Round '.($i + 1), $e, null);
       }
     }