Consider the following scenario. In a Microsoft Forefront Threat Management Gateway (TMG) 2010 environment, you use Microsoft SQL Server remote logging, and the remote database name includes a hyphen (-) character. In this scenario, no logs are written to the remote SQL Server database, and many large logging queue files are created in the install_dir\Logs directory. Such file creation could cause disk space to become exhausted, depending on the traffic.
To resolve this issue, install the software update that is described in the following Microsoft Knowledge Base article:
2517957 Software Update 1 Rollup 4 for Forefront Threat Management Gateway (TMG) 2010 Service Pack 1
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.