Index: src/OFSPXSocket.h
==================================================================
--- src/OFSPXSocket.h
+++ src/OFSPXSocket.h
@@ -87,10 +87,12 @@
  *
  * @param network The network on which the node to connect to is
  * @param node The node to connect to
  * @param port The port (sometimes also called socket number) on the node to
  *	       connect to
+ * @throw OFConnectionFailedException Connecting failed
+ * @throw OFAlreadyConnectedException The socket is already connected or bound
  */
 - (void)connectToNetwork: (uint32_t)network
 		    node: (unsigned char [_Nonnull IPX_NODE_LEN])node
 		    port: (uint16_t)port;
 
@@ -156,10 +158,12 @@
  * @brief Bind the socket to the specified network, node and port.
  *
  * @param port The port (sometimes called socket number) to bind to. 0 means to
  *	       pick one and return it.
  * @return The address on which this socket can be reached
+ * @throw OFConnectionFailedException Binding failed
+ * @throw OFAlreadyConnectedException The socket is already connected or bound
  */
 - (OFSocketAddress)bindToPort: (uint16_t)port;
 @end
 
 OF_ASSUME_NONNULL_END

Index: src/OFSPXStreamSocket.h
==================================================================
--- src/OFSPXStreamSocket.h
+++ src/OFSPXStreamSocket.h
@@ -88,10 +88,12 @@
  *
  * @param network The network on which the node to connect to is
  * @param node The node to connect to
  * @param port The port (sometimes also called socket number) on the node to
  *	       connect to
+ * @throw OFConnectionFailedException Connecting failed
+ * @throw OFAlreadyConnectedException The socket is already connected or bound
  */
 - (void)connectToNetwork: (uint32_t)network
 		    node: (unsigned char [_Nonnull IPX_NODE_LEN])node
 		    port: (uint16_t)port;
 
@@ -161,10 +163,12 @@
  * @brief Bind the socket to the specified network, node and port.
  *
  * @param port The port (sometimes called socket number) to bind to. 0 means to
  *	       pick one and return it.
  * @return The address on which this socket can be reached
+ * @throw OFConnectionFailedException Binding failed
+ * @throw OFAlreadyConnectedException The socket is already connected or bound
  */
 - (OFSocketAddress)bindToPort: (uint16_t)port;
 @end
 
 OF_ASSUME_NONNULL_END

Index: src/OFSequencedPacketSocket.h
==================================================================
--- src/OFSequencedPacketSocket.h
+++ src/OFSequencedPacketSocket.h
@@ -134,10 +134,12 @@
 
 /**
  * @brief Whether the socket can block.
  *
  * By default, a socket can block.
+ *
+ * @throw OFSetOptionFailedException The option could not be set
  */
 @property (nonatomic) bool canBlock;
 
 /**
  * @brief Whether the socket is a listening socket.
@@ -146,10 +148,13 @@
 
 /**
  * @brief The remote address.
  *
  * @note This only works for accepted sockets!
+ *
+ * @throw OFNotOpenException The socket is not open
+ * @throw OFInvalidArgumentException The socket has no remote address
  */
 @property (readonly, nonatomic) const OFSocketAddress *remoteAddress;
 
 /**
  * @brief The delegate for asynchronous operations on the socket.
@@ -173,10 +178,12 @@
  * If the buffer is too small, the receive operation fails.
  *
  * @param buffer The buffer to write the packet to
  * @param length The length of the buffer
  * @return The length of the received packet
+ * @throw OFReadFailedException Receiving failed
+ * @throw OFNotOpenException The socket is not open
  */
 - (size_t)receiveIntoBuffer: (void *)buffer length: (size_t)length;
 
 /**
  * @brief Asynchronously receives a packet and stores it into the specified
@@ -246,10 +253,12 @@
 /**
  * @brief Sends the specified packet.
  *
  * @param buffer The buffer to send as a packet
  * @param length The length of the buffer
+ * @throw OFWriteFailedException Sending failed
+ * @throw OFNotOpenException The socket is not open
  */
 - (void)sendBuffer: (const void *)buffer length: (size_t)length;
 
 /**
  * @brief Asynchronously sends the specified packet.
@@ -294,22 +303,29 @@
 
 /**
  * @brief Listen on the socket.
  *
  * @param backlog Maximum length for the queue of pending connections.
+ * @throw OFListenFailedException Listening failed
+ * @throw OFNotOpenException The socket is not open
  */
 - (void)listenWithBacklog: (int)backlog;
 
 /**
  * @brief Listen on the socket.
+ *
+ * @throw OFListenFailedException Listening failed
+ * @throw OFNotOpenException The socket is not open
  */
 - (void)listen;
 
 /**
  * @brief Accept an incoming connection.
  *
  * @return An autoreleased sequenced packet socket for the accepted connection.
+ * @throw OFAcceptFailedException Accepting failed
+ * @throw OFNotOpenException The socket is not open
  */
 - (instancetype)accept;
 
 /**
  * @brief Asynchronously accept an incoming connection.
@@ -352,10 +368,12 @@
 - (void)cancelAsyncRequests;
 
 /**
  * @brief Closes the socket so that it can neither receive nor send any more
  *	  datagrams.
+ *
+ * @throw OFNotOpenException The socket is not open
  */
 - (void)close;
 @end
 
 OF_ASSUME_NONNULL_END

Index: src/OFSequencedPacketSocket.m
==================================================================
--- src/OFSequencedPacketSocket.m
+++ src/OFSequencedPacketSocket.m
@@ -316,18 +316,21 @@
 	_listening = true;
 }
 
 - (instancetype)accept
 {
-	OFSequencedPacketSocket *client =
-	    [[[[self class] alloc] init] autorelease];
+	OFSequencedPacketSocket *client;
 #if (!defined(HAVE_PACCEPT) && !defined(HAVE_ACCEPT4)) || !defined(SOCK_CLOEXEC)
 # if defined(HAVE_FCNTL) && defined(FD_CLOEXEC)
 	int flags;
 # endif
 #endif
 
+	if (_socket == OFInvalidSocketHandle)
+		@throw [OFNotOpenException exceptionWithObject: self];
+
+	client = [[[[self class] alloc] init] autorelease];
 	client->_remoteAddress.length =
 	    (socklen_t)sizeof(client->_remoteAddress.sockaddr);
 
 #if defined(HAVE_PACCEPT) && defined(SOCK_CLOEXEC)
 	if ((client->_socket = paccept(_socket,