Internet Communication (ICF/ICM/ITS)

When a classic ABAP screen (dynpro) is displayed to a user in a browser via SAP GUI for HTML, what component performs that conversion?

You need the exact server name and port for the /sap/bc/ping URL and don't want to guess 8000. Where does SICF hand you the right values per protocol?

Inside the Internet Communication Manager (ICM), which thread actually accepts an incoming TCP/IP connection, and which one does the request/response work — and why does mixing them up misread a saturated ICM?

You want the Internet Communication Manager (ICM) to actually start with an instance. Which profile parameter governs that, and which one is NOT the on/off switch even though it also names the ICM?

The integrated Internet Transaction Server (ITS) keeps exactly one HTML template cache shared by all work processes. Why does that design force the use of mutex locks?

A stale HTML template keeps serving from the integrated Internet Transaction Server (ITS). If you just wait, when does its cache entry expire on its own?

You invalidated the Internet Transaction Server (ITS) HTML template cache but users still see the old page. What two scope-and-cleanup facts are usually missed?

In the SITSPMON Feature List, a feature shows kernel availability (VK) but the integrated Internet Transaction Server (ITS) refuses to start. How can one feature block startup entirely?

In SITSPMON the integrated ITS status reads ITSPE_DISABLED on one system and ITSPE_NOTFOUND on another. What different action does each one point you to?

You change an itsp/* parameter with the Change Parameters button in SITSPMON to fix a live issue. Why might it silently revert, and which parameters can you even change there?

The Memory statistics tab in SITSPMON is empty or showing nothing useful. What precondition is almost always missing?

You do a hard shutdown of the Internet Communication Manager (ICM) expecting the dispatcher to bring it right back, but it stays down. What setting did you forget?

The Internet Communication Manager (ICM) web admin URL is http(s)://host:admin_port/sap/admin — but which profile parameters actually define admin_port?

You open Goto → HTTP Log in SMICM to check a request that just failed, but the newest entries aren't there. Why, and what one action makes them appear?

You changed ICM configuration and want it live without a full restart. What does Administration → ICM → Configuration → Reload actually refresh at runtime?

You added several users to icmauth.txt with icmon so the team can use the ICM web administration, but only some can actually change settings. What determines who gets admin rights?

A legacy setup still fronts Internet Transaction Server (ITS) apps with the standalone SAP ITS 6.20 server. On a SAP NetWeaver 7.0+ system, what is the actual constraint?

Since Release 6.40 the Internet Transaction Server (ITS) is integrated. Where do you actually configure and monitor it, and why is there no separate web server to tune?

In SMICM you need to restart the ICM on a busy system. When do you use the soft shutdown vs the hard one, and what's the cost of grabbing the wrong one?

An HTTP request reaches the Internet Communication Manager (ICM) and must be handed to an ABAP work process. Why isn't this just another network socket hop, and what is actually used?

On a system where backend responses are running slow, why does the Internet Communication Manager (ICM) NOT exhaust its small worker-thread pool — and what would break if it didn't have the watchdog?

A team wants to disable the Internet Communication Framework (ICF) to "reduce attack surface," and assumes it only matters for inbound web traffic. What two things are they getting wrong?

You see HTTP requests timing out but ABAP dialog work processes look healthy. What distinguishes how the Internet Communication Manager (ICM) runs, and why does that change where you look?

You want a quick browser check that the Internet Communication Manager (ICM) is accepting and forwarding HTTP requests. What's the prerequisite step before the Internet Communication Framework (ICF) ping URL will work, and what does a failure actually tell you?

For convenience you set up the Internet Communication Manager (ICM) web administration over plain HTTP on an internal network. Why is that a real exposure, not just a formality?

On a dual-stack system, the Internet Communication Manager (ICM) routes each HTTP request to either the ABAP or the J2EE engine via the URL prefix table. Which stack does a matching prefix go to, and what is the default for everything else?

On a Java-only solution with no SAP GUI, you've lost the login to the Internet Communication Manager (ICM) web admin interface. Where are those credentials, and why can't you fix it the usual ABAP way?

A colleague activated the Internet Transaction Server (ITS) service in SICF but the integrated ITS still won't run. Which profile parameter actually turns the integrated ITS on or off?

You renamed a host (or changed a service-to-port mapping) but the Internet Communication Manager (ICM) keeps connecting to the old address without any restart. What buffer is stale, and how do you clear it?

A cached response is stale on a web scenario. You clear the Internet Transaction Server (ITS) template cache but nothing changes. What separate ICM-level cache did you overlook?