the Apache proxy server (custom web server) stopped automatically.
This issue is so notorious, most common reason which could cause this is start/stop of teamsite services since custom web server will have context paths which refers to your virtual mount that becomes unavailable. you can modify your start/stop teamsite scripts to include action against your custom web server or just remember to recycle when your teamsite get recycled.
Thanks Sheikh for your reply. But we didn't stop TeamSite, only the fact is Apache got stopped by itself. Any thoughts?Thanks in advance.