# Troubleshooting common data collection errors All possible error messages (for all protocols) for issues with data collection have been listed below. Click any message under a protocol to view why that error might have occurred, and how to resolve it. If you don't find your error listed here, or if you need any assistance with OpManager in general, please get in touch with our support team at [opmanager-support@zohocorp.com](mailto:opmanager-support@zohocorp.com). ## Error Messages by Protocol | Protocol | Error message | |---|---| | [SNMP](#snmpd) | | | [WMI](#wmi) | | | [CLI](#cli) | | | [HyperV](#hyper-v) | | | [VMware](#vmware) | | | [Hypervisor (Xen)](#xen) | | | [Nutanix](#nutanix) | | | [UCS](#ucs) | | | [Hardware](#hardware) | | | [URL](#url) | | | [Script](#script) | | | [Interface](#interface) | | **Disclaimer:** The troubleshooting steps mentioned below might include some actions to be done outside of the OpManager environment. Please perform them at your own risk and exercise due diligence when executing them in your network. It is highly advised to consult your system and network administrators with the necessary troubleshooting measures before you proceed with performing them. --- ## SNMP ### `Request Timed Out` This error might be displayed due to the following reasons: 1. Wrong credentials/Wrong community name 2. The SNMP agent in the monitored device is unable to respond to OpManager's requests within 5 seconds (the default timeout) 3. Device is unreachable 4. Port is not available **Steps to troubleshoot this issue:** 1. Check if the right credentials and the community name have been provided. 2. For point 2, increasing timeout will resolve this issue. You can add a new credential profile with increased timeout value for that device. 3. Also check if the device is reachable and if the corresponding port is available in the device. --- ### `Null variable in response` This error might be displayed when the response from the MIB OID associated with that monitor is getting a "Null" response from the end device. **Steps to troubleshoot this issue:** You can perform an SNMP walk on the device (using SNMPwalk tool or any other third-party tool) and check the response from the corresponding OID. --- ### `IO error sending PDU. Send Error: Session Remote Host Unknown` This error might occur due to the following reasons: 1. IP Address/DNS name not resolved 2. Port is not open **Steps to troubleshoot this issue:** 1. Check the device by performing an SNMP walk. 2. If there are issues with DNS, resolve them and make sure the port is available. --- ### `There is no such variable name in this mib.` The SNMP Agent does not support the MIB. **Steps to troubleshoot this issue:** 1. You can perform an SNMP walk on the device and check the corresponding OID. 2. If the response is proper but you're still encountering this issue, [please contact our support team](mailto:opmanager-support@zohocorp.com) with logs and required screenshots. --- ### `No Error code registered` This is the default value of error code. This is to indicate that no error code has been registered. **Steps to troubleshoot this issue:** 1. Since no proper error code has been registered, you can check the OID response in the MIB browser or through an SNMP walk. 2. If the response there is proper or if any other error messages are displayed, [please contact our support team](mailto:opmanager-support@zohocorp.com) with logs and required screenshots. --- ### `This is a end of MIB View.` If a getBulk/getNext operation is running and the OID selected is the last node of the MIB, this error will occur. This might be due to internal configuration issues. **Steps to troubleshoot this issue:** To identify the cause of this issue and troubleshoot it, [please contact our support team](mailto:opmanager-support@zohocorp.com) with the logs, MIB/OID details and required screenshots. --- ### `There is no such object in this MIB.` It denotes that the added MIBS have not been implemented in the device. **Steps to troubleshoot this issue:** 1. Use the SNMP walk command to check if the MIB is correct. 2. It is recommended to contact the vendor and get the necessary MIBs and then create custom monitors. --- ### `Session Remote Host Unknown` This error might occur due to the following reasons: 1. IP Address/DNS name not resolved 2. Port is not open **Steps to troubleshoot this issue:** 1. Check the device by performing an SNMP walk. 2. If there are issues with DNS, resolve them and make sure the port is available. --- ### `There is no such instance in this MIB.` It denotes that the added OID instance has not been implemented in the device. **Steps to troubleshoot this issue:** 1. Check the corresponding OID with an SNMP walk. 2. If you don't receive a response, please contact the concerned vendor about this. 3. It is recommended to contact the vendor and get the necessary MIBs and then create custom monitors. --- ### `A no access error occurred` This error occurs if the OID that you are trying to set a value to, has no read/write access. **Steps to troubleshoot this issue:** 1. Check it with the SNMP walk command. 2. Also, check the user access in SNMP configuration if you provided the necessary privileges. 3. If these two points are satisfied and you still encounter the same issue, [please contact our support team](mailto:opmanager-support@zohocorp.com) with necessary logs. --- ## WMI ### `The RPC server is unavailable` This error is encountered when the device is not reachable, or RPC/WMI service is not running. **Steps to troubleshoot this issue:** Refer this KB to troubleshoot this RPC unavailability issue: https://www.manageengine.com/network-monitoring/kb/troubleshooting-rpc-server-unavailability.html