Merge branch '223-vcp51-release-element125' of github.com:netappdocs/…

…element-software-internal into 223-vcp51-release-element125

_include/concept_rtfi_configure_introduction.adoc

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+// This include file is used in the element-software and element-software-123 repos.
+// You must assess updates to this content for impact on all Element software documentation versions.
+NetApp SolidFire storage systems use the Return To Factory Image (RTFI) process to write a software image to a new node or restore a node to its  original factory state. The RTFI process securely erases all existing data and configurations (if any) and installs an unconfigured NetApp Element software image. The RTFI process is available for all SolidFire nodes.
+
+SolidFire systems use one RTFI process for all Element software installations. This includes internal manual installations performed by developers, automatic installations by automated framework tests, field installations by service engineers and customers, and installations performed by various integrators and partners. The same RTFI process is used on all SolidFire nodes, regardless of the chassis or node type in use, to automatically fix any issues.
+
+The intended audience for this guide is integrators who install, configure, use, or troubleshoot storage-related issues.
+
+* Linux: You have some background with Linux systems.
+* Networking: You have a familiarity with server networking and networked storage, including IP addresses, netmasks, and gateways.
+
+WARNING: The RTFI process is data destructive and securely erases all data and configuration details from the node and installs a new operating system. Verify that the node used for the RTFI process is not active as part of a cluster.
+
+Deploy and install the RTFI International Organization for Standardization (ISO) image and perform the RTFI process:
+
+* xref:task_rtfi_deployment_and_install_options.adoc[RTFI deployment and installation options]
+* xref:task_rtfi_process.adoc[Perform the RTFI process]
+* xref:task_rtfi_options_menu.adoc[RTFI options menu]
+
+== Find more information
+* https://www.netapp.com/data-storage/solidfire/documentation/[NetApp SolidFire Resources Page^]
+* https://docs.netapp.com/sfe-122/topic/com.netapp.ndc.sfe-vers/GUID-B1944B0E-B335-4E0B-B9F1-E960BF32AE56.html[Documentation for earlier versions of NetApp SolidFire and Element products^]
+
+// 2022 FEB 2, DOC-4281

_include/enable_remote_ssh_session.adoc

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+You can open a TCP port for an SSH reverse tunnel connection with NetApp Support. This connection enables NetApp Support to log in to your management node.
+
+.Before you begin
+* For management services 2.18 and later, the capability for remote access is disabled on the management node by default. To enable remote access functionality, see https://docs.netapp.com/us-en/element-software/mnode/task_mnode_ssh_management.html[Manage SSH functionality on the management node].
+
+* If your management node is behind a proxy server, the following TCP ports are required in the sshd.config file:
++
+[cols=3*,options="header",cols="15,25,60"]
+|===
+| TCP port
+| Description
+| Connection direction
+| 443 | API calls/HTTPS for reverse port forwarding via open support tunnel to the web UI | Management node to storage nodes
+| 22 | SSH login access | Management node to storage nodes or from storage nodes to management node
+|===
+
+.Steps
+* Log in to your management node and open a terminal session.
+* At a prompt, enter the following:
++
+`rst -r  sfsupport.solidfire.com -u element -p <port_number>`
+
+* To close the remote support tunnel, enter the following:
++
+`rst --killall`
+
+* (Optional) Disable https://docs.netapp.com/us-en/element-software/mnode/task_mnode_ssh_management.html[remote access functionality] again.
++
+NOTE: SSH remains enabled on the management node if you do not disable it. SSH enabled configuration persists on the management node through updates and upgrades until it is manually disabled.