I have a host (for the SAP GRC, running on port 50000) and it just stopped responding for an hour. Whenever I tried to access the page I received the code 500 ( internal error ). The same happened when i did the connection test of the SAP_PROXY_ESR under "HTTP Connections to External Server" in SM59.
After one hour it got back to work.
How can I find out what was the source of the problem so that I can act on it?