How did you set it?
The common way is to write it in the web.config:
<system.web>
<httpRuntime executionTimeout="181">
</system.web>
<compilation debug="false" />
Debug must be set to false otherwise the timeout will be ignored.
Don't forget to restart your AppPool or IIS.
与恶龙缠斗过久,自身亦成为恶龙;凝视深渊过久,深渊将回以凝视…