ABAP Connectivity - RFC

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  Test connection in SM59 fails with the error Invalid Length. Check Parameters
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  RFC destination fails with error Failed to open sideinfo.dat
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  RFC Trace files Increasing in Size
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  Unicode option in SM59 cannot be changed
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  Work process in on Hold RFC status in SM50
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  Activation Types for Type T RFC Destinations
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  Gateway connections remain open because of firewall
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  RFC Connections remain in SM04
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  CPIC Return Code 679 - Transaction Program not Registered
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  RFC connections on “NATed” environments
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  Common RFC Problems

Resource handling as of 740 SP2

Changed configuration as of 7.40 SP2

Session Priority and Work Process Quota in SAP Kernel 7.4x

Remote logon, Trusted-Trusting

Trusted/trusting systems

Trusted/Trusting Relationships Between SAP Systems

Analyzing "Remote login" problems in SM59

Missing output of RFC short dump after login error

How to setup a trusted RFC connection between SAP systems: a step-by-step guide

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  RFC destination fails with error Incomplete Logon Data
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  Remote Logon button in SM59 does not work
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  List of Trusted RFC return codes
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  Logon screen is shown in Sm59 when doing a Connection Test
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  RFC passwords not available after system copy, client copy or migration
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  Create an RFC trust relationship between 2 SAP systems - A step-by-step guide

Traces and analysis

RFC trace generation scenarios

RFC tracing for ABAP-to-ABAP communication

RFC trace generation for sporadic errors

Trace of information on RFC caller

Determining RFC client when sign-on problems occur

Recent Released Notes

Important t/qRFC-knoweldge

Known scenarios & limitations in tRFC qRFC - SM58 SMQ1 SMQ2

SMQR - Inbound queue scheduler settings - explained

Determining the maximum connections in transaction SMQS

Outbound Scheduler/qOUT Scheduler

Delete unprocessed LUWs in the qRFC

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  tRFC calls in SM58 fail with the error Logon failed
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  How to find the correct application component if Queues are in status SYSFAIL
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  Example scenarios using “Max Runtime” and “Scheduler Monitoring” in SMQS
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  Entries are in status "Transaction Executing" in Sm58
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  Running RSTRFCEG or RSTRFCEH indicates No inconsistencies
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  Intermittent error Error when opening an RFC connection in SM58
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  Inbound Scheduler (SMQR) is in status WAIT
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  QRFCTRACE table contains an excessive amount of entries
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  Reorganize option in transaction SMQ1 and SMQ2
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  Deletion of data in ARFCSDATA table
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  Outbound Scheduler (SMQS) remains in status WAITING
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  Resources in Transaction SARFC Explained
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  How to check if Oracle Statistics have been updated as per Note 1020260
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  Entries with error message “Error when opening an RFC connection” in transaction SM58
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  Many background ARFCXXXX jobs visible in SM37
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  Deleting unwanted entries from RFC tables (ARFCSSTATE, ARFCSDATA etc.)
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  Entries in Transaction SM58 are in status "Transaction recorded"

bgRFC units for a particular destination are not being processed

No further processing of bgRFC units

Presentation

Unified Connectivity Overview (updated in June 2021)
https://archive.sap.com/documents/docs/DOC-57032
https://www.sap.com/documents/2015/07/ccf7ed8e-5b7c-0010-82c7-eda71af511fa.html
39 slides

Blogs

UCON RFC Basic Scenario - Guide to Setup and Operations (updated in 2021)
https://archive.sap.com/documents/docs/DOC-57565
https://www.sap.com/documents/2015/07/a494b08e-5b7c-0010-82c7-eda71af511fa.html
34 slides

Articles

SAP Insider: Secure Your System Communications with Unified Connectivity (2014)
https://archive.sap.com/documents/docs/DOC-51003
https://www.sap.com/documents/2015/07/94c4cb8f-5b7c-0010-82c7-eda71af511fa.html
5 pages

Whitepaper RFC (2014)
http://support.sap.com/securitywp -> https://support.sap.com/content/dam/support/en_us/library/ssp/security-whitepapers/securing_remote-function-calls.pdf
39 pages

Video Blog Series (2014)

UCON - Step 1/7 - How to Set the Profile Parameter for UCON
https://archive.sap.com/documents/docs/DOC-56694

UCON - Step 2/7 - How to Schedule the Batch Job to Collect the Statistical Records for UCON
https://archive.sap.com/documents/docs/DOC-56694

UCON - Step 3/7 - How to Run the UCON Setup to Create the Technical Entities Needed
https://archive.sap.com/documents/docs/DOC-56695

UCON - Step 4/7 - How to Choose a Suitable Duration of the Logging and Evaluation Phase
https://archive.sap.com/documents/docs/DOC-56696

UCON - Step 5/7 - How to Assign a Function Module to the Default CA
https://archive.sap.com/documents/docs/DOC-56697

UCON - Step 6/7 - How to Assign a Function Module to the Evaluation Phase
https://archive.sap.com/documents/docs/DOC-56698

UCON - Step 7/7 - How to Assign a Function Module to the Final & Check-active Phase
https://archive.sap.com/documents/docs/DOC-56699

Online Help

Unified Connectivity: Tools
https://help.sap.com/viewer/1ca554ffe75a4d44a7bb882b5454236f/7.40.26/en-US/ec3b480f69de447c899bcc12da6b33dd.html
https://help.sap.com/viewer/1ca554ffe75a4d44a7bb882b5454236f/7.5.21/en-US/ec3b480f69de447c899bcc12da6b33dd.html
https://help.sap.com/viewer/1ca554ffe75a4d44a7bb882b5454236f/7.52.8/en-US/ec3b480f69de447c899bcc12da6b33dd.html

Consulting Notes (Application component BC-MID-RFC)

Note 2044302 - Scheduling standard job SAP_UCON_MANAGEMENT on 7.40
Note 2190119 - Background information about SAP S/4HANA technical job repository as of 7.50

Note 2687602 - AUTHORITY_CHECK_RFC checks differently than RFC
(Relevant only for own development of remote scenarios)

Note 2521222 - Protokollierungspflichtige Tabellen im RFC / UCON

Note 2435969 - Flexible Reading Interval for UCON RFC Data Collector
(UCON rfc data collector dumps with memory issues)