# Interpreting Error Message 1. [Unknown Host](https://www.manageengine.com/products/oputils/help/interpreting-error-message.html#E1001) 2. [Unreachable Host](https://www.manageengine.com/products/oputils/help/interpreting-error-message.html#E1002) 3. [Not a Switch](https://www.manageengine.com/products/oputils/help/interpreting-error-message.html#E1003) 4. [Not a Router](https://www.manageengine.com/products/oputils/help/interpreting-error-message.html#E1004) 5. [MAC not available in cache](https://www.manageengine.com/products/oputils/help/interpreting-error-message.html#E1005) 6. [No response to SNMP queries](https://www.manageengine.com/products/oputils/help/interpreting-error-message.html#E2001) 7. [Specified OID not implemented](https://www.manageengine.com/products/oputils/help/interpreting-error-message.html#E2002) 8. [Unable to perform SNMP Set](https://www.manageengine.com/products/oputils/help/interpreting-error-message.html#E2003) 9. [Community with read/write permission required](https://www.manageengine.com/products/oputils/help/interpreting-error-message.html#E2004) 10. [Not able to retrieve complete data from the MIB](https://www.manageengine.com/products/oputils/help/interpreting-error-message.html#E2005) 11. [Not able to retrieve MAC Address of the Switch](https://www.manageengine.com/products/oputils/help/interpreting-error-message.html#E2006) 12. [Not a Table OID](https://www.manageengine.com/products/oputils/help/interpreting-error-message.html#E2007) 13. [Operation Timed Out](https://www.manageengine.com/products/oputils/help/interpreting-error-message.html#E3001) 14. [Not a CISCO Router](https://www.manageengine.com/products/oputils/help/interpreting-error-message.html#E4001) 15. [Wrong CLI Authentication Parameters](https://www.manageengine.com/products/oputils/help/interpreting-error-message.html#E4002) 16. [Not a Cisco Device](https://www.manageengine.com/products/oputils/help/interpreting-error-message.html#E4005) 17. [No Access Lists Available](https://www.manageengine.com/products/oputils/help/interpreting-error-message.html#E4007) 18. [Unrecognised OID](https://www.manageengine.com/products/oputils/help/interpreting-error-message.html#E5001) 19. [Invalid OID](https://www.manageengine.com/products/oputils/help/interpreting-error-message.html#E5002) 20. [Unable to bind to Port](https://www.manageengine.com/products/oputils/help/interpreting-error-message.html#E5003) 21. [Old Password is incorrect](https://www.manageengine.com/products/oputils/help/interpreting-error-message.html#E6001) 22. [Unable to send mail](https://www.manageengine.com/products/oputils/help/interpreting-error-message.html#E6002) 23. [User already exists](https://www.manageengine.com/products/oputils/help/interpreting-error-message.html#E6003) 24. [TCP Reset tool supports only switches and routers](https://www.manageengine.com/products/oputils/help/interpreting-error-message.html#E8001) 25. [No TCP connection established in the device](https://www.manageengine.com/products/oputils/help/interpreting-error-message.html#E8002) 26. [Could not reset the connection](https://www.manageengine.com/products/oputils/help/interpreting-error-message.html#E8003) 27. [Not a DHCP server](https://www.manageengine.com/products/oputils/help/interpreting-error-message.html#E9001) 28. [DHCP Scope Monitor only supports windows NT and 2000 DHCP servers](https://www.manageengine.com/products/oputils/help/interpreting-error-message.html#E9002) 29. [The DHCP server already exist in the list](https://www.manageengine.com/products/oputils/help/interpreting-error-message.html#E9003) 30. [The Community already exist in the list](https://www.manageengine.com/products/oputils/help/interpreting-error-message.html#E9004) --- ## Unknown Host **Message Summary** The IP Address or the Host Name does not exist in the network. **Cause** 1. Failure in ping action and DNS service (i.e. the DNS Server could not resolve the IP Address or the Host Name specified). ## Unreachable Host **Message Summary** The IP Address or the Host Name is not alive in the network. **Cause** 1. The IP Address or the Host Name specified is switched off. 2. The IP Address or the Host Name specified is behind a Firewall. ## Not a Switch **Message Summary** The referred IP Address or the Host Name is not a Switch. ## Not a Router **Message Summary** The Router name specified is not that of a Router. **Cause** 1. The input is not a switch. **Note:** If the router has the OID .\1.3.6.1.2.1.4.1 and "ip forwarding" set to "true(1)" the device is considered as a router. ## MAC not available in cache **Message Summary** The MAC Address entered is not available in the OpUtils server cache. ## No Response to SNMP Queries **Message Summary** The IP Address or the Host Name is not SNMP enabled. **Cause** 1. The IP Address or the Host Name specified is not an SNMP device. 2. The IP Address or the Host Name specified does not respond using the SNMP parameters available under SNMP Settings. **Action:** 1. To install SNMP read the section [Installing SNMP](https://www.manageengine.com/products/oputils/help/interpreting-error-message.html#). 2. To change SNMP Settings click My Home -> Settings -> SNMP. ## Specified OID is not Implemented **Message Summary** The required OID is not implemented by the SNMP agent running in the device specified. ## Unable to perform SNMP SET **Message Summary** The Server is not able to perform the SNMP SET operations on the specified host. **Cause** 1. Unable to set the input parameters on the Target Host Name due to: - invalid input parameters, or - network traffic. **Action:** 1. To change SNMP Settings click My Home -> Settings -> SNMP. ## Community with read/write permission required **Message Summary** The entered community string does not have the Write permission to perform the SET operation on the target host. ## Not able to retrieve complete data from the MIB **Message Summary** The required information could not be retrieved from the MIB implemented in the input device. ## Not able to retrieve MAC Address of the Switch **Message Summary** The MAC Address of the given switch cannot be retrieved from the MIB through SNMP. Mapping the switch ports will not be possible without the MAC Address of the switch. ## Not a Table OID **Message Summary** When the specified OID is not a Table OID. Specify a valid table OID or browse to select a table OID of a MIB. ## Operation Timed Out **Message Summary** Server wait time period (Server Timeout value) to get the response or result from the target host has expired. ## Not a CISCO Router **Message Summary** The Router specified does not belong to the CISCO Router series. ## Wrong CLI Authentication Parameters **Message Summary** Unable to login to the Router with the given CLI parameters. **Cause** 1. CLI system prompt or the password prompt or the password specified for CLI authentication is incorrect. **Action:** To change CLI password prompt or the system prompt click My Home -> Settings -> CLI. ## Not a Cisco Device The input device is not a Cisco device. ## No Access Lists Available No access lists available for the given Cisco device. **Cause** 1. No data is available for the device being queried. **Action:** Check whether the input device is a Cisco device. ## Unrecognised OID **Message Summary** The OID does not exist in any of the loaded MIBs. **Cause** 1. The OID does not exist either in the MIBs bundled with OpUtils or in the MIB's database. ## Invalid OID **Message Summary** The OID specified is not valid. **Cause:** 1. The Syntax is a displaystring OR 2. The OID Type is of type table or table entry OR 3. The OID Type is scalar and if the index value specified is not 0. **Note:** The above error message occurs only for SNMP Graph Tool, as the OID specified cannot be plotted in a graph. ## Unable to bind to Port The message appears for the following tools: 1. Trap Receiver 2. Config File Viewer 3. SNMP Trap Settings **Trap Receiver** The message appears: 1. If OpUtils is not started as root AND the Port specified for receiving traps is less than 1024 (in Linux). 2. The port is already occupied. Action: To start Trap Service in port less than 1024, start OpUtils as root. Or else start Trap Service in port greater than 1024. To re-configure trap settings login as admin and click My Home -> SNMP Trap Settings and change the Port number. **Config File Viewer** The message appears if OpUtils is not started as root or when port 69 is occupied. (TFTP Service is started by OpUtils in Port 69). Action: Start OpUtils as root or free the port. **SNMP Trap Settings** The message appears if: 1. OpUtils is not started as root AND the Port specified for receiving traps is less than 1024 (in Linux). ## Old Password is incorrect **Message Summary** The Password entered in the "Old Password" field is incorrect. Action: Enter the password correctly. ## Unable to send mail **Message Summary** Unable to send mail to the intended recipient. **Cause** 1. The SMTP Server settings are incorrectly set. 2. The sender's email id is entered incorrectly. **Action** 1. Click Admin -> Settings and choose SMTP. Recheck if the SMTP Service is running in the Port specified. 2. Check the sender's email id. ## User already exists **Message Summary** The user specified already exists. **Action** 1. Check the list of users displayed in the Admin -> User Management page. 2. Enter user name and password correctly. ## TCP Reset tool supports only switches and routers **Message Summary** The input device in the TCP Reset tool can only be switches or routers. **Action:** Specify a switch or a router as input. ## No TCP connection established in the device **Message Summary** The input device do not have any TCP connections currently established. ## Could not reset the connection **Message Summary** The TCP connection could not be reset. **Cause:** The given SNMP write community is incorrect. **Action:** Specify the correct write community of the device. ## Not a DHCP server **Message Summary** The input device is not a DHCP Server. Action: Specify a DHCP Server to monitor its scopes. ## DHCP Scope Monitor only supports windows NT and 2000 DHCP servers **Message Summary** The DHCP Scope Monitor tool can only be used to monitor the scopes of Windows NT and 2000 DHCP Servers. ## The DHCP server already exist in the list **Message Summary** The specified device is already added. ## The Community already exist in the list **Message Summary** The SNMP community string specified is already available in the list of communities.