A dns record has changed and is cached on the proxy server
This is by design
You can use the DNSTools.exe to do this. The DNSTools utility can be downloaded by Microsoft.
This displays the information about test.lubby.org
"C:\Programme\Microsoft ISA Server\DNSTools.exe" /D /SN test.lubby.org
and this one deletes the entry
"C:\Programme\Microsoft ISA Server\DNSTools.exe" /C /SN test.lubby.org
To fush the whole cache you use the /C parameter only.
About the Author
Wim Peeters is electronics engineer with an additional master in IT and over 30 years of experience, including time spent in support, development, consulting, training and database administration. Wim has worked with SQL Server since version 6.5. He has developed in C/C++, Java and C# on Windows and Linux. He writes knowledge base articles to solve IT problems and publishes them on the Lubby Knowledge Platform.