We just moved to IIS 8.5 on 64 bit Windows Server 2012 R2.
This new server has 4 GIG of RAM, dual processor of 2.3 GHz.
When we bring up any of our website, sometimes, we get "Service Temporarily Unavailable. The server is temporarily unable to service your request due to maintenance downtime or capacity problems. Please try again later."
The same websites don't have the issues on Windows Server 2008 R2 and IIS 7, with 2 GIG of RAM, dual processor of 2.13 GHz, which has less resource than the new server that's having the issue.
What causes the error, and how can we fix it ?
Thank you.