BorlandTalk.com Borland discussion newsgroups   Archives   FAQ   Search   Memberlist   Usergroups   Register   Profile   Log in to check your private messages   Log in  NT Service / DCOM server failing on Windows 2003          BorlandTalk.com Forum Index -> C++ Builder (Native API) View previous topic :: View next topic   Author Message Mike Collins Guest Posted: Wed Feb 22, 2006 5:03 pm    Post subject: NT Service / DCOM server failing on Windows 2003 Hi all, got a really annoying problem that we are struggling to solve. Sorry if this is not the correct group be since it involves NT Services and ACL rights I thought I might be able to push it. I posted a few weeks ago about creating a DCOM server interface as an NT Service so that it could effectively run all the time, regardless of if any users were logged on to Windows. Remy directed me to a MSDN article http://msdn.microsoft.com/library/default.asp?url=/library/en-us/dncomg/html/localserv.asp which described the necessary registry changes that needed to be made in order to get the service to work correctly. Having followed this, we have created out DCOM / NTService which works perfectly fine under Windows 2000.When we tested it on Windows XP service pack two we had to make some amendments to the permissions in order to get it to function properly (I notice a post on the cppbuilder.activex (R.E. DCOM events WindowsXP SP2) which had a link to http://www.ct2k.com/cns2006/CT2K-XPDCOM.ppt). Under XP SP2 the NT Service ran ok but we couldn't connect to it with our client application. We basically resolved it by adding the current user account into all the permissions for DCOM on that machine AND for the particular DCOM server. Now we are trying to get it to work under Windows 2003 Enterprise with no sucess. We've tried all the combinations that we can think of, of adding in users to the permissions with no success. It's is defiantly a security permissions problem. The Service starts ok and runs fine but the client cannot connect to it. One of our Russian Developers found this article http://www.rsdn.ru/article/com/comsec.xml#ERBA which (although it is in Russian) we've followed but still with not success. The code has been tested with and without the following HRESULT hr = CoInitializeSecurity(sd, -1, NULL, NULL, RPC_C_AUTHN_LEVEL_PKT, RPC_C_IMP_LEVEL_IMPERSONATE, NULL, EOAC_NONE, NULL); to no avail - hr never equals S_OK. The article seems to suggest that if a users is a member of a group that does not have permissions to run DCOM, then even if the user is directly added to the permissions for that object, they still will not be able to execute the DCOM object. It also seems to suggest that if a user is a member of two groups, A & B, if A is allowed to run DCOM and B is not, then overall the user will NOT be able to run the DCOM object <- is this correct? I anyone shed some light on this, it's a real problem for use Many thanks in advance, Mike Collins Back to top Remy Lebeau (TeamB) Guest Posted: Thu Feb 23, 2006 12:03 am    Post subject: Re: NT Service / DCOM server failing on Windows 2003 "Mike Collins" <its (AT) TheBottomOfThePost (DOT) com> wrote in message news:43fc85d2$1 (AT) newsgroups (DOT) borland.com... Quote: Hi all, got a really annoying problem that we are struggling to solve. Win2003 changes the requirements of DCOM servers in services, and the VCL prior to BDS 2006 could not natively handle it. The workaround is to edit the project's WinMain() function to not call Application->Initialize() under Win2003, and then call Application->Initialize() after the service is being started. For example: --- Project.cpp --- #include <ComObj.hpp> external bool bIsAppInitialized; bool __fastcall IsRunningInInstallMode() { static TSysCharSet switches = TSysCharSet() << '-' << '/'; return FindCmdLineSwitch("REGSERVER", switches, true) || FindCmdLineSwitch("UNREGSERVER", switches, true) || FindCmdLineSwitch("INSTALL", switches, true) || FindCmdLineSwitch("UNINSTALL", switches, true); } WINAPI WinMain(HINSTANCE, HINSTANCE, LPSTR, int) { Comobj::CoInitFlags = COINIT_MULTITHREADED; CoInitializeEx(NULL, COINIT_MULTITHREADED); CoInitializeSecurity(NULL, -1, NULL, NULL, RPC_C_AUTHN_LEVEL_NONE, RPC_C_IMP_LEVEL_ANONYMOUS, NULL, EOAC_NONE, NULL); try { // To support Windows Server 2003 we need to make sure // that StartServiceCtrlDispatcher() is called before // CoRegisterClassObject(). Unfortunately, the VCL does // not do this. Application->Initialize() below calls // CoRegisterClassObject() first, which will then cause // the COM server to fail to initialize properly under // Windows Server 2003. Earlier versions of Windows do // not suffer from this issue... // Win Server 2003 = v5.2 if( !((Win32MajorVersion == 5) && (Win32MinorVersion >= 2)) || IsRunningInInstallMode() ) { Application->Initialize(); bIsAppInitialized = true; } //... } catch (Exception &exception) { Sysutils::ShowException(&exception, Sysutils::ExceptAddr()); } CoUninitialize(); return 0; } --- Service.cpp --- bool bIsAppInitialized = false; void __fastcall TVPIEventCenterService::ServiceStart(TService *Sender, bool &Started) { ErrCode = 0; Win32ErrCode = 0; // To support Windows Server 2003 we need to make sure // that StartServiceCtrlDispatcher() is called before // CoRegisterClassObject(). Unfortunately, the VCL does // not do this. Application->Initialize() calls // CoRegisterClassObject() first, which will then cause // the COM server to fail to initialize properly under // Windows Server 2003. Application->Initialize() is // delayed until below so that StartServiceCtrlDispatcher() // can be called first. Earlier versions of Windows do // not suffer from this issue... if( !bIsAppInitialized ) { Svcmgr::Application->Initialize(); bIsAppInitialized = true; } //... } As for BDS 2006, Borland tried to address the issue with a new property in TApplication, but it did not work properly in the first release. I do not know if Update 1 fixed it or not. Gambit Back to top Mike Collins Guest Posted: Thu Feb 23, 2006 12:03 pm    Post subject: Re: NT Service / DCOM server failing on Windows 2003 Thank you Remy, I have not had a chance to test this yet but I will post the result as soon as I know. This is the sort of information that you would just never come across with out the newsgroups. This looks like it is exactly the problem. Out of interest, how did you discover this? I'm intreged how you find this information or whether you can across it yourself. I'm only asking because I want to try and resolve these problems myself when I run up against a brick wall. What are the backward compatibility issues with this code relating to win 2000 and win XP Thanks again Mike Collins "Remy Lebeau (TeamB)" <no.spam (AT) no (DOT) spam.com> wrote in message news:43fcf481$1 (AT) newsgroups (DOT) borland.com... Quote: "Mike Collins" <its (AT) TheBottomOfThePost (DOT) com> wrote in message news:43fc85d2$1 (AT) newsgroups (DOT) borland.com... Hi all, got a really annoying problem that we are struggling to solve. Win2003 changes the requirements of DCOM servers in services, and the VCL prior to BDS 2006 could not natively handle it. The workaround is to edit Back to top Remy Lebeau (TeamB) Guest Posted: Thu Feb 23, 2006 8:03 pm    Post subject: Re: NT Service / DCOM server failing on Windows 2003 "Mike Collins" <its (AT) TheBottomOfThePost (DOT) com> wrote in message news:43fd9660 (AT) newsgroups (DOT) borland.com... Quote: Out of interest, how did you discover this? A newsgroup search. I had a problem with my COM server failing when I first migrated it to Win2003. It took several days to track it down. Of course, now that I know the problem, it takes only a minute or two to find the information online now. Many people have reported the same issue and similar workarounds. Quote: What are the backward compatibility issues with this code relating to win 2000 and win XP The code I gave you is a copy/paste from my own project, which works fine on all NT-based systems. As you can see, the WinMain() function looks at the OS version and then applies the workaround to only Win2003 and later versions. Under earlier versions, the runtime behavior is exactly the same as it used to be. 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