Unable to receive faxes on Windows Server 2012 R2 with fxssvc crashing in the module fxst30.dll Error Code: 0xC0000005

Applies to

Digital Fax on Windows Server 2012 R2

Description

You may notice in Digital Fax you are unable to receive faxes; if you keep an eye on the server while it is receiving a fax you can see that the call is answered and it attempts to receive the Fax, but then the service crashes and starts itself up again.

You may notice the following events in the application event log:

Event ID: 1001
Event Name: APPCRASH

Problem signature:

P1: fxssvc.exe
P2: 6.3.9600.16384
P3: 5215e627
P4: fxst30.dll
P5: 6.3.9600.16384
P6: 5215eb1a
P7: c0000005
P8: 0000000000005371

And also:

Event ID: 1000
Description:
Faulting application name: fxssvc.exe, version: 6.3.9600.16384, time stamp: 0x5215e627
Faulting module name: fxst30.dll, version: 6.3.9600.16384, time stamp: 0x5215eb1a
Exception code: 0xc0000005
Fault offset: 0×0000000000005371
Faulting process id: 0x1dbc
Faulting application start time: 0x01cf75b8c2163700
Faulting application path: C:\Windows\system32\fxssvc.exe
Faulting module path: C:\Windows\system32\fxst30.dll

And finally:

The Fax Service Provider ‘Microsoft Modem Device Provider’ encountered a problem and needed to close.
Error Code: 0xC0000005
This error code indicates the cause of the error.
A Windows Error Report was generated with full details about the problem.
The Fax service will restart now.

Cause

Microsoft bug on FXST30.DLL

Solution

Make all Windows Updates, reboot and check the FXST30.DLL version.

The buggy version of the dll is 6.3.9600.16384

After installation of the roll-up ( http://support.microsoft.com/kb/3000850 ), the version of FXST30.dll should be 6.3.9600.17415

If unable to update it with Windows Updates you can also force its replacement.

Use the file attached (unzip the file and rename it FXST30.DLL)

Use Unlocker tool to remove the original FXST30.DLL and replace it

Reboot the services/the server and try again.