| A | |
| Abort [Unixqueue] | Event handlers can raise this exception to cancel a group of handlers, events, and resources. | 
| Addressing_method_not_supported [Uq_engines_compat] | |
| Addressing_method_not_supported [Uq_engines] | Raised by  | 
| Already_installed [Shell_sys] | Raised when the job handlers are already installed | 
| Auth_error [Netldap] | Authentication error | 
| Authentication_error [Netpop] | |
| Authentication_error [Netsmtp] | |
| B | |
| Bad_glob_expr [Netglob] | An syntax error in the glob expression; the argument is the bad expression | 
| Bad_header_field [Nethttp] | Raised when a header field cannot be parsed. | 
| Bad_message [Nethttp_client] | The server sent a message which cannot be interpreted. | 
| Bad_state [Netpop] | |
| Break [Netshm] | |
| Broken_communication [Uq_engines_compat] | |
| Broken_communication [Uq_engines] | Some engines indicate this error when they cannot continue because the other endpoint of communication signals an error. | 
| Buffer_underrun [Netchannels] | Raised by input methods if the internal buffer of the channel is too empty to read even one byte of data. | 
| Byte_order_mark [Netconversion] | Raised when it is tried to get the code point of the BOM at the beginning of the string | 
| C | |
| Cancelled [Uq_engines_compat] | |
| Cancelled [Uq_engines] | The callback function of a  | 
| Cannot_represent [Netnumber] | raised if a conversion can't be done | 
| Cannot_represent [Netconversion] | Raised when a certain Unicode code point cannot be represented in the selected output encoding | 
| Client_is_down [Rpc_client] | The RPC call cannot be performed because the client has been shut down in the meantime. | 
| Closed [Netsys_polypipe] | |
| Closed_channel [Netchannels] | Raised when channel operations are called when the channel is closed | 
| Closed_channel [Uq_engines_compat] | |
| Closed_channel [Uq_engines] | Raised when a method of a closed channel object is called (only channel methods count). | 
| Cluster_service_unavailable [Rpc_proxy.ManagedSet] | Raised by  | 
| Command_failure [Netchannels] | Raised by  | 
| Communication_error [Rpc_client] | an I/O error happened | 
| Config_error [Netplex_config] | |
| Connection_lost [Rpc_server] | raised by the 'reply' function if the connection to the original caller has been lost in the meantime. | 
| Container_variable_not_found [Netplex_cenv] | The variable does not exist | 
| Container_variable_type_mismatch [Netplex_cenv] | The (dynamically typed) variable has the wrong type | 
| Context [Netsys_gssapi.GSSAPI] | |
| Corrupt_file [Netshm] | Raised when a violation of the object format is detected | 
| Credential [Netsys_gssapi.GSSAPI] | |
| Cursor_out_of_range [Netconversion] | Raised when it is tried to move the cursor beyond the beginning of the string or beyond the end of the string. | 
| D | |
| Deadlock [Netshm] | Raised when a deadlock situation was detected. | 
| Dest_failure [Netxdr] | raised if the dest_* function are applied to non-matching xdr_value | 
| E | |
| EAGAIN_RD [Netsys_types] | |
| EAGAIN_RD [Netsys_crypto_types.TLS_EXCEPTIONS] | |
| EAGAIN_WR [Netsys_types] | A read or write cannot be done because the descriptor is in non-blocking mode and would block. | 
| EAGAIN_WR [Netsys_crypto_types.TLS_EXCEPTIONS] | A read or write cannot be done because the descriptor is in non-blocking mode and would block. | 
| Empty [Netmcore_queue] | Raised when the queue is empty and the operation cannot be done | 
| Empty [Netcamlbox] | |
| End_of_string [Netconversion] | Raised when it is tried to access the character after the end of the
 string (at position  | 
| Err_status [Netpop] | |
| Error [Rpc_transport] | Passed back as  | 
| Error [Nettls_gnutls_bindings] | |
| Error [Netulex.Ulexing] | Lexical error | 
| Executable_not_found [Shell_sys] | Raised when an executable file cannot be found; the argument is the search name | 
| Extension_not_found [Netx509] | |
| Extensions_not_supported [Netmech_scram] | Returned by clients when the server enables an unsupported extension. | 
| F | |
| FTP_error [Netftp_client] | Something went wrong, often on socket level | 
| FTP_method_perm_failure [Netftp_client] | |
| FTP_method_temp_failure [Netftp_client] | |
| FTP_method_unexpected_reply [Netftp_client] | These exceptions may be raised during execution by the FTP method. | 
| FTP_protocol_violation [Netftp_client] | The server violates the FTP specification | 
| FTP_timeout [Netftp_client] | A timeout on the control or data connection (this is a fatal error) | 
| Fatal_error [Shell_sys] | An error is fatal if it is not possible to recover from it in a predictable manner. | 
| G | |
| GSSAPI_error [Netftp_client] | An error on GSSAPI level | 
| H | |
| HTTP [Netcgi_common] | Exception raised by various functions of this library to return to the user agent an appropriate error page with the specified http-status (this exception must be caught by the connector and a default answer sent). | 
| Header_too_short [Netasn1] | |
| Host_not_found [Uq_resolver] | This host cannot be resolved | 
| Http_error [Nethttp_client] | Deprecated in the scope of  | 
| Http_protocol [Nethttp_client] | The request could not be processed because the exception condition was raised. | 
| I | |
| Immutable [Netmime] | Raised if it is tried to modify a read-only value. | 
| Integrity_error [Netmech_scram.Cryptosystem] | |
| Invalid_encoding [Netmech_scram] | Returned by clients when something cannot be decoded. | 
| Invalid_server_signature [Netmech_scram] | Returned by clients when the signature sent by the server is invalid (i.e. | 
| Invalid_username_encoding [Netmech_scram] | Returned by clients when the username does not match the requirements. | 
| K | |
| Keep_call [Rpc_client] | This exception can be raised by the callback function that is invoked when the server response arrives. | 
| L | |
| LDAP_error [Netldap] | The server indicates a (logical) error. | 
| Late_drop [Rpc_server] | This can be raised in encryption/decryption functions to prevent that a response is sent. | 
| Line_too_long [Netmime_string] | Raised when the hard limit of the line length is exceeded | 
| Line_too_long [Uq_io] | May be raised by  | 
| M | |
| Malformed_URL [Neturl] | Raised by a number of functions when encountering a badly formed URL. | 
| Malformed_code [Netconversion] | Raised when an illegal byte sequence is found | 
| Malformed_code_at [Netconversion] | An illegal byte sequence is found at this byte position | 
| Mem_not_supported [Uq_engines_compat] | |
| Mem_not_supported [Uq_multiplex] | May be raised by multiplex controller methods  | 
| Mem_not_supported [Uq_engines] | Moved to  | 
| Message_lost [Rpc_client] | got EOF when some pending procedure calls were not replied or even sent | 
| Message_timeout [Rpc_client] | After all retransmissions, there was still no reply | 
| Message_too_big [Netcamlbox] | |
| N | |
| Name [Netsys_gssapi.GSSAPI] | |
| Name_resolution_error [Nethttp_client] | Could not resolve this name - same as  | 
| Next [Netshm] | |
| No_Unix_process_group [Shell_sys] | Raised by functions referring to Unix process groups when the job has not been started in its own process group. | 
| No_reply [Nethttp_client] | There was no response to the request because some other request failed earlier and it was not allowed to send the request again. | 
| No_resource [Netmcore] | No such resource, or no resource of the expected type | 
| Not_implemented [Netcgi1_compat] | Raised by some functions/exceptions when a feature of the old model cannot be implemented in the new model or vice versa | 
| Not_in_container_thread [Netplex_cenv] | Raised when the caller's thread is not a container thread | 
| Notification [Netldap] | An unsolicited notification. | 
| Null_pointer [Nettls_gnutls_bindings] | |
| Null_pointer [Netgss_bindings] | |
| O | |
| Out_of_handlers [Equeue] | Raised by  | 
| Out_of_pool_memory [Netmcore_mempool] | |
| Out_of_range [Netasn1] | |
| Out_of_range [Netnumber] | raised if string position out of range | 
| Out_of_space [Netsys_mem] | |
| Oversized [Netcgi.Argument] | |
| Oversized [Netcgi_common] | |
| P | |
| Parse_error [Netasn1] | Byte position in string | 
| Parse_error [Netaddress] | A parsing error. | 
| Partial_character [Netconversion] | Raised when the last character of the string is an incomplete
 multi-byte character, and it is tried to get the code point
 (using  | 
| Permanent_error [Netsmtp] | |
| Protocol_error [Netmech_scram] | Returned by clients when the server violates the protocol. | 
| Protocol_error [Netpop] | |
| Protocol_error [Netsmtp] | |
| Proxy_error [Nethttp_client] | An error status from a proxy. | 
| R | |
| Recv_queue_empty [Nethttpd_kernel] | |
| Redirect_request [Nethttpd_types] | The "early" redirect is only allowed in stage 1 of HTTP processing. | 
| Redirect_response [Nethttpd_types] | The "late" redirect is only allowed in stage 3 of HTTP processing. | 
| Reject [Equeue] | May be raised by event handlers to reject events | 
| Response_dropped [Rpc_client] | Drop reason: The response exceeded the configured maximum message size | 
| Response_too_large [Nethttp_client] | The length of the response exceeds the configured maximum | 
| Rpc_cannot_unpack [Rpc] | RPC protocol error (bad data) | 
| Rpc_server [Rpc] | an exception generated by the RPC server | 
| S | |
| SASLprepError [Netsaslprep] | Raised when a string cannot be transformed | 
| Send_queue_empty [Nethttpd_kernel] | |
| Server_error [Netmech_scram] | Returned by clients when the server sent an error code | 
| Service_unavailable [Rpc_proxy.ManagedClient] | Procedure calls may end with this exception when the reliability cache disables the service | 
| Sharedvar_no_permission [Netplex_sharedvar] | It is not allowed to set the value | 
| Sharedvar_not_found [Netplex_sharedvar] | The variable does not exist. | 
| Sharedvar_null [Netplex_sharedvar] | The initial value of a shared exception variable | 
| Sharedvar_type_mismatch [Netplex_sharedvar] | The (dynamically typed) variable has the wrong type (string/exn) | 
| Short_memory_buffer [Nettls_gnutls_bindings] | |
| Shutdown_not_supported [Netsys] | See  | 
| Socks_error [Uq_socks5] | Raised when error messages of the SOCKS proxy are received, or because of other SOCKS-related problems. | 
| Standard_response [Nethttpd_types] | Some HTTP containers allow you to raise this exception. | 
| Subprocess_error [Shell] | The string contains the called commands in a readable representation. | 
| T | |
| TLS_error [Netsys_types] | A fatal error occurred (i.e. | 
| TLS_error [Netsys_crypto_types.TLS_EXCEPTIONS] | A fatal error occurred (i.e. | 
| TLS_switch_request [Netsys_types] | The server requested a rehandshake (this exception is thrown in the client) | 
| TLS_switch_request [Netsys_crypto_types.TLS_EXCEPTIONS] | The server requested a rehandshake (this exception is thrown in the client) | 
| TLS_switch_response [Netsys_types] | The client accepted or denied a rehandshake (this exception is thrown in the server). | 
| TLS_switch_response [Netsys_crypto_types.TLS_EXCEPTIONS] | The client accepted or denied a rehandshake (this exception is thrown in the server). | 
| TLS_warning [Netsys_types] | A non-fatal error occurred. | 
| TLS_warning [Netsys_crypto_types.TLS_EXCEPTIONS] | A non-fatal error occurred. | 
| Telnet_protocol [Nettelnet_client] | Wrapper for exceptions that already passed the exception handler. | 
| Terminate [Equeue] | May be raised by event handlers to accept events while terminating themselves | 
| Timeout [Netldap] | Raised when the TCP connection times out. | 
| Timeout [Nethttp_client] | A timeout. | 
| Timeout [Uq_engines_compat] | |
| Timeout [Uq_engines] | Used by  | 
| Too_many_arguments [Netcgi_common] | Hit the limit  | 
| Too_many_descriptors [Netsys_pollset_win32] | |
| Too_many_redirections [Nethttp_client] | While following redirections the limit has been reached | 
| Transient_error [Netsmtp] | |
| Type_mismatch [Netplex_encap] | Raised when an encapulated type is tried to be unwrapped by the wrong encapsulation module | 
| U | |
| URL_syntax_error [Nethttp_client] | This URL cannot be parsed after a redirection has been followed. | 
| Unbound_exception [Rpc_client] | This exception can be raised by the callback function that is invoked when the server response arrives. | 
| Unsupported_algorithm [Netx509_pubkey_crypto] | Raises if the crypto backend does not support an algorithm | 
| Unsupported_expr [Netglob] | The notations  | 
| W | |
| Watchdog_timeout [Uq_engines_compat] | |
| Watchdog_timeout [Uq_engines] | Used by the watchdog engine to indicate a timeout. | 
| X | |
| Xdr_failure [Netxdr] | Usually a problem during packing | 
| Xdr_format [Netxdr] | Format error found during unpacking a string | 
| Xdr_format_message_too_long [Netxdr] | The message is too long and cannot be packed into a string |