2676550 - Issue during start of sapinst with "You can use SAPINST_GUI_HOSTNAME to override the webserver hostname for the GUI " using Software Provisioning Manager Tool

INFO <timestamp> (<domain name\user>) (SLPCommunicator) [synxcsymgt.cpp:192] CSySystemMgtImpl::openUrlWithBrowser()
Opening url 'https://<HOSTNAME>:4237/sapinst/docs/index.html'

INFO <timestamp> (<domain name\user>) (startInstallation) [SLPSelftestHandler.cpp:156]
********************************************************************************
ERROR in Selftest. Return code: 1
Connecting to <HOSTNAME> failed.
You can use SAPINST_GUI_HOSTNAME to override the webserver hostname for the GUI.
********************************************************************************

INFO <timestamp> (<domain name\user>) (startInstallation) [SLPSelftestHandler.cpp:157]

Full output of selftest:
java.lang.NoClassDefFoundError: C:\Users\<>\AppData\Local\Temp\3\sapinst_exe/<nnn>/<nnn>\baselib.dll

Exception in thread "main"

INFO <timestamp> (<domain name\user>) (SLPCommunicator) [CWebDispatcherHandlerBase.cpp:379]
********************************************************************************
Leaving Web Dispatcher log files
 in C:/Users/.sapinst/<HOSTNAME>/<nnn>.
********************************************************************************

Exit status of child: 1
 Not closing window (Exit State: 1; exitOnError: 0).