IBM-TN3270E-MIB

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Category: Domain: SNA/Legacy, SNA and Legacy Protocols, Vendor: IBM

Description: IBM MIB for managing TN3270E (Telnet 3270 Enhanced) server sessions providing SNA terminal emulation statistics.

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What Is IBM-TN3270E-MIB?

This is an IBM MIB for managing TN3270E servers, which provide Telnet-based 3270 terminal emulation gateways connecting IP clients to SNA/mainframe applications. It exposes connection- and session-oriented data, particularly detailed statistics on connection rejections, alongside general TN3270E service objects. This module is explicitly useful for monitoring the software/service status of a TN3270E gateway, since a rising count of rejected connections signals capacity, authentication, or configuration issues on the terminal-emulation service. It is an IBM enterprise product MIB likely deployed alongside standard TCP/IP MIBs given TN3270E rides over TCP, and it may complement other IBM SNA-related management MIBs. It is typically deployed in mainframe access environments where an IBM TN3270E server front-ends 3270 terminal sessions for remote or IP-based clients, with IBM-TN3270E-MIB SNMP monitoring focused on tracking connection-rejection trends on the gateway.

IPNetwork Monitor allows you to monitor SNMP objects defined in IBM-TN3270E-MIB. Use the built-in SNMP Monitoring Browser to explore available variables, view their current values and descriptions, and select the objects you want to monitor. You can then create SNMP monitors, configure thresholds, and receive alerts when monitored values change.

Supported Devices

IBM TN3270E server
SNA/mainframe terminal-emulation gateway

Monitoring Examples

An operator monitors ibmtn3270eConnRejectTable / ibmtn3270eConnRejectEntry, examining ibmtn3270eConnRejectReason, ibmtn3270eConnRejectClient, and ibmtn3270eConnRejectTime (indexed by ibmtn3270eConnRejectIndex) to identify why particular client connections were refused. A sudden spike in rejection entries from a specific ibmtn3270eConnRejectAddrType/client range would indicate a client misconfiguration, server capacity limit, or security block on the TN3270E service.

What Can Be Monitored

connection rejection count
connection rejection reason
rejecting client address
rejection timestamp

Imported Objects

From RFC-1212

OBJECT-TYPE

From RFC1155-SMI

enterprises

From SNMPv2-SMI

IpAddress

From SNMPv2-TC

DisplayString

OIDs

OID symbolic	OID numeric	Type	Access	Description
ibmtn3270eMIB	1.3.6.1.4.1.2.6.119.4.18.1
ibmtn3270eConnRejectTable	1.3.6.1.4.1.2.6.119.4.18.1.1		not-accessible	A table of information about TN3270E connection rejections. This table does not contain information for connections that were successfully established, but terminated abnormally.
ibmtn3270eConnRejectEntry	1.3.6.1.4.1.2.6.119.4.18.1.1.1		not-accessible	Information indicating why a particular client connection was rejected.
INT ibmtn3270eConnRejectIndex	1.3.6.1.4.1.2.6.119.4.18.1.1.1.1	INTEGER	not-accessible	A unique identifier of a row in the connection rejection table.
INT ibmtn3270eConnRejectAddrType	1.3.6.1.4.1.2.6.119.4.18.1.1.1.2	INTEGER	read-only	A indication of the type of client address provided in ibmtn3270eConnRejectClient.
OCT ibmtn3270eConnRejectClient	1.3.6.1.4.1.2.6.119.4.18.1.1.1.3	OCTET STRING	read-only	The IP address of the client whose connection was rejected.
INT ibmtn3270eConnRejectReason	1.3.6.1.4.1.2.6.119.4.18.1.1.1.4	INTEGER	read-only	The reason the connection was rejected. Some of the values sound similar, but represent different failure points within the TN3270E server software. Also, some values are very specific to the TN3270E server software internals, so they may seem a bit cryptic to the user. noportinfo (1) // GetPortInfo failed to retrieve Port information cliunknown (2) // HostName filter failure - client_hostname unknown clinoauth (3) // Client is not authorized by FilterUser sockblock (4) // Could not make socket nonblocking nodeterm (5) // Node is terminating createfail (6) // TN3270Create failed to create session environment seqnum (7) // 0xFF seq number not doubled negfailed (8) // Negotiation failed notelquale (9) // Not TELQUALE_REQUEST termtypefail (10) // Verification of terminal type failed notypeprtgen (11) // TELQUALE_ASSOCIATE req but not TYPE_PRINTER_GENERIC clirplyfail (12) // Sending reply to client failed. valtelquale (13) // Validation of TELQUALE_REQUEST failed clisendfail (14) // Send to client failed failtelquale (15) // Verification of TELQUAL_IS failed termtypagain (16) // Received invalid terminal type for 2nd time noportagain (17) // GetPortInfo failed to retrieve Port information prtnoluname (18) // Associated printer req. with no LU name specified clinoauthent (19) // Client is not authorized by Filter entries clinoauthflt (20) // Client not authorized by Filter entries after retry noluconf (21) // REJECT_UNSUPP_REQ: No LUs configured. noportmore (22) // GetPortInfo failed to retrieve Port information noresource (23) // No resource spe+cified on Port & no name requested nameresource (24) // Resource specified on Port doesn't match name requested prtnoluagain (25) // Associated printer req. with no LU name specified noimplu (26) // No implicit LUs are available lunotfound (27) // Specified LU not found/available valluprt (28) // Validation of LU type failed for assoc. printer vallu (29) // Validation of LU type failed prtlunofind (30) // LU for associated printer not found nameinuse (31) // LU name requested currently in use reqlunofind (32) // LU requested not found valprtagain (33) // Validation of LU type failed for assoc. printer valluagain (34) // Validation of LU type failed luprtnofind (35) // LU for associated printer not found poolluinuse (36) // Requested pooled LU is already in use poollunofind (37) // Requested pooled LU is not found for assoc. printer restypnofind (38) // Requested type of resource is not found poolluconf (39) // Requested pooled LU is not found in config. list lucapreach (40) // LU capping value reached for this client address noappnmem (41) // APPN memory above the constrained threashold nomoreconn (42) // Max. number of TN3270 connection reached pooldep (43) // The pool from which the resource was requested has been depleted termnorsp (44) // The session was terminated before receiving a response from APPN
STR ibmtn3270eConnRejectTime	1.3.6.1.4.1.2.6.119.4.18.1.1.1.5	DisplayString	read-only	A string providing the date and time the connection was rejected.

RFC description

IBM TN3270E Terminal Emulation MIB for managing TN3270E terminal services and session information

Start monitoring IBM TN3270E server (SNA/mainframe terminal-emulation gateway) with a free 30-day trial of IPNetwork Monitor. Import MIBs, browse SNMP OIDs, create custom SNMP monitors, configure alerts, and monitor any SNMP-enabled network device from a single console.

Download IBM-TN3270E-MIB

What Is IBM-TN3270E-MIB?

Supported Devices

Monitoring Examples

What Can Be Monitored

This MIB depends on

Related MIBs

RFC description