SNA Server/Host Integration Server 2000 Manager Gives "CoCreateInstance Failed" Error (281729)

SYMPTOMS

When you are using SNA Server and Host Integration Server 2000 Manager, you may receive the following error message when you attempt to expand the Microsoft SNA Manager tree:

CoCreateInstance failed

(There may also be other scenarios in which this error occurs.)

After you click OK, the Manager closes. If Dr. Watson was configured as the default debugger, a Drwtsn32.log file is created.

The following is an example of a Dr. Watson file that was created in a scenario in which Host Integration Server 2000 was installed on a Windows 2000 Server. The Drwtsn32.log file indicates that an application exception occurred in MMC.exe in function CSnaOleObj::DoVerb:

Application exception occurred:
        App: mmc.exe (pid=<pid_number>)
        When: 10/25/2000 @ 11:13:48.022
        Exception number: c0000005 (access violation)
.
[data omitted]
.
State Dump for Thread Id 0xab8

eax=00000000 ebx=00311518 ecx=00be2500 edx=00000000 esi=00000000 edi=00000112
eip=6780d68f esp=0006f7e4 ebp=0006f814 iopl=0         nv up ei pl nz na pe nc
cs=001b  ss=0023  ds=0023  es=0023  fs=003b  gs=0000             efl=00000202

function: CSnaOleObj::DoVerb
        6780d680 8b542408         mov     edx,[esp+0x8]          ss:0088cdbb=????????
        6780d684 8b8190000000     mov     eax,[ecx+0x90]         ds:00be2590=00000000
        6780d68a 52               push    edx
        6780d68b 8b542408         mov     edx,[esp+0x8]          ss:0088cdbb=????????
FAULT ->6780d68f 8b08             mov     ecx,[eax]              ds:00000000=????????
        6780d691 52               push    edx
        6780d692 50               push    eax
        6780d693 ff5158           call    dword ptr [ecx+0x58]   ds:013ffad6=????????
        6780d696 c20800           ret     0x8
        6780d699 90               nop
        6780d69a 90               nop
        6780d69b 90               nop
        6780d69c 90               nop
        6780d69d 90               nop
        6780d69e 90               nop
        6780d69f 90               nop

CAUSE

The SNA Server/Host Integration Server 2000 Web Client was installed on a computer that already had SNA Server or Host Integration Server 2000 installed on it.

When you use a Web browser to install the Web Client, you are warned that you cannot install over an existing client/server installation. For additional information, click the article number below to view the article in the Microsoft Knowledge Base:

280740 Issues Surrounding the SNA Server/HIS 2000 Web Client

However, if you were viewing the Web Client files from My Computer or Windows Explorer and inadvertently ran the 3270full.htm or 5250full.htm file, the Web Client installation would have proceeded without warning.

RESOLUTION

Use the following procedure to resolve this problem:

Close the Manager and stop the SNABase service.
Use the Add/Remove utility in Control Panel to remove the Web client.
Rerun the SNA Server/Host Integration Server 2000 Setup and select the reinstall option.
Restart the computer.
Go back into SNA Server/Host Integration Server 2000 Manager and test.