Product Solution Installer (PSI) fails with error: "Apache failed to stop" in Windchill

Starting Apache. 
DEBUG  getWebserverPort:  Getting apache port value from WC.wt.webserver.port. 
DEBUG   WC.wt.webserver.port is not set. Falling to WC_PROMPTED.ig.serverAndServletSettings.webServerHttpPort for apache port value. 
DEBUG  - Checking if web service is running... 
DEBUG  - checking URL connection to http://XXX.XXX.XXX:80  ... 
DEBUG  - Exception while attempting to connect (web service may simply not be running) 
java.net.ConnectException: Connection refused: getsockopt
	at sun.nio.ch.Net.pollConnect(Native Method) ~[?:?]
	at sun.nio.ch.Net.pollConnectNow(Net.java:672) ~[?:?]
	at sun.nio.ch.NioSocketImpl.timedFinishConnect(NioSocketImpl.java:547) ~[?:?]
	at sun.nio.ch.NioSocketImpl.connect(NioSocketImpl.java:602) ~[?:?]
	at java.net.Socket.connect(Socket.java:633) ~[?:?]
	at sun.net.NetworkClient.doConnect(NetworkClient.java:178) ~[?:?]
	at sun.net.www.http.HttpClient.openServer(HttpClient.java:533) ~[?:?]
	at sun.net.www.http.HttpClient.openServer(HttpClient.java:638) ~[?:?]
	at sun.net.www.http.HttpClient.<init>(HttpClient.java:281) ~[?:?]
	at sun.net.www.http.HttpClient.New(HttpClient.java:386) ~[?:?]
	at sun.net.www.http.HttpClient.New(HttpClient.java:408) ~[?:?]
	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1309) ~[?:?]
	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1242) ~[?:?]
	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1128) ~[?:?]
	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:1057) ~[?:?]
	at com.ptc.windchill.install.suite.runnables.AbstractWebService.attemptConnect(AbstractWebService.java:229) ~[Execute.zip:?]
	at com.ptc.windchill.install.suite.runnables.AbstractWebService.isRunning(AbstractWebService.java:202) [Execute.zip:?]
	at com.ptc.windchill.install.suite.runnables.AbstractWebService.start(AbstractWebService.java:296) [Execute.zip:?]
	at com.ptc.windchill.install.suite.WindchillLoaderManagerImpl.startApache(WindchillLoaderManagerImpl.java:761) [Execute.zip:?]
	at com.ptc.windchill.install.suite.WindchillLoaderManagerImpl.loadSubinstallerData(WindchillLoaderManagerImpl.java:262) [Execute.zip:?]
	at com.ptc.windchill.install.suite.WindchillLoaderManagerImpl.process(WindchillLoaderManagerImpl.java:143) [Execute.zip:?]
	at com.ptc.windchill.install.suite.WindchillLoaderManager.process(WindchillLoaderManager.java:40) [Execute.zip:?]
	at com.ptc.windchill.install.framework.InstallAction.run(InstallAction.java:512) [Execute.zip:?]
	at com.ptc.windchill.install.framework.InstallAction.install(InstallAction.java:330) [Execute.zip:?]
	at com.zerog.ia.installer.actions.CustomAction.installSelf(Unknown Source) [IAClasses.zip:?]
	at com.zerog.ia.installer.InstallablePiece.install(Unknown Source) [IAClasses.zip:?]
	at com.zerog.ia.installer.InstallablePiece.install(Unknown Source) [IAClasses.zip:?]
	at com.zerog.ia.installer.InstallablePiece.install(Unknown Source) [IAClasses.zip:?]
	at com.zerog.ia.installer.InstallablePiece.install(Unknown Source) [IAClasses.zip:?]
	at com.zerog.ia.installer.GhostDirectory.install(Unknown Source) [IAClasses.zip:?]
	at com.zerog.ia.installer.InstallablePiece.install(Unknown Source) [IAClasses.zip:?]
	at com.zerog.ia.installer.Installer.install(Unknown Source) [IAClasses.zip:?]
	at com.zerog.ia.installer.actions.InstallProgressAction.ae(Unknown Source) [IAClasses.zip:?]
	at com.zerog.ia.installer.actions.ProgressPanelAction$1.run(Unknown Source) [IAClasses.zip:?]
DEBUG  - apache appears to be down.  Starting it... 
DEBUG  - Executing: cmd.exe /C set SystemRoot 
DEBUG  - Executing: cmd.exe /C set SystemRoot 
DEBUG  - Starting Apache with: C:\Windows\system32\cmd.exe /C start "Apache C:\ptc\Windchill_13.0\HTTPServer" /MIN C:\Windows\system32\cmd.exe /C C:\ptc\Windchill_13.0\HTTPServer\bin\httpd.exe -f C:\ptc\Windchill_13.0\HTTPServer\conf\httpd.conf 
DEBUG  - Executing: C:\Windows\system32\cmd.exe /C start Apache C:\ptc\Windchill_13.0\HTTPServer /MIN C:\Windows\system32\cmd.exe /C C:\ptc\Windchill_13.0\HTTPServer\bin\httpd.exe -f C:\ptc\Windchill_13.0\HTTPServer\conf\httpd.conf 
DEBUG  - Post-startup connection check timed out. 
DEBUG  - com.ptc.windchill.install.psi.InstallCommandException 
DEBUG  - at com.ptc.windchill.install.suite.runnables.AbstractWebService.start(AbstractWebService.java:300) 
DEBUG  - at com.ptc.windchill.install.suite.WindchillLoaderManagerImpl.startApache(WindchillLoaderManagerImpl.java:761) 
DEBUG  - at com.ptc.windchill.install.suite.WindchillLoaderManagerImpl.loadSubinstallerData(WindchillLoaderManagerImpl.java:262) 
DEBUG  - at com.ptc.windchill.install.suite.WindchillLoaderManagerImpl.process(WindchillLoaderManagerImpl.java:143) 
DEBUG  - at com.ptc.windchill.install.suite.WindchillLoaderManager.process(WindchillLoaderManager.java:40)