many concurrent smtp connections

Recently our website often reported 503 errors: "HTTP error 503." The service is unavailable. But the brush one or two and normal. It is estimated that the maximum number of concurrent connections to the Web site is likely to be exceeded. What exactly is an HTTP connection. A page is loaded with a picture and a style, a script, and a request for these things is to share one connection or multiple

1, modify the user process can open the number of files limitOn a Linux platform, regardless of whether you write a client or a service-side program, the highest concurrency is limited by the number of files that can be opened by the system at the same time as the user's single process (because the system creates a socket handle for each TCP connection) for high concurrent TCP connection processing. Each socket handle is also a file handle. You can us

1. modify the number of files that can be opened by a user process On the Linux platform, whether it is a client program or a server program, during high-concurrency TCP connection processing, the maximum number of concurrent connections is limited by the number of files that the system can open for a single process (this is because the system creates a socket handle for each TCP connection, each socket han

1. modify the number of files that can be opened by a user processOn the Linux platform, whether it is a client program or a server program, during high-concurrency TCP connection processing, the maximum number of concurrent connections is limited by the number of files that the system can open for a single process (this is because the system creates a socket handle for each TCP connection, each socket hand

{Trace ("Stream one State:" +event.info.code);}Private Function OnStreamHandler2 (event:netstatusevent): void{Trace ("Stream two states:" +event.info.code);}Private Function OnStreamHandler3 (event:netstatusevent): void{Trace ("Stream three states:" +event.info.code);}Private Function OnStreamHandler4 (event:netstatusevent): void{Trace ("Stream four states:" +event.info.code);}Private Function OnStreamHandler5 (event:netstatusevent): void{Trace ("Stream five states:" +event.info.code);}Third, st

1, modify the user process can open the number of files limitOn a Linux platform, regardless of whether you write a client or a service-side program, the highest concurrency is limited by the number of files that can be opened by the system at the same time as the user's single process (because the system creates a socket handle for each TCP connection) for high concurrent TCP connection processing. Each socket handle is also a file handle. You can us

1, modify the user process can open the number of files limitOn a Linux platform, regardless of whether you write a client or a service-side program, the highest concurrency is limited by the number of files that can be opened by the system at the same time as the user's single process (because the system creates a socket handle for each TCP connection) for high concurrent TCP connection processing. Each socket handle is also a file handle. You can us

of files available for the client socket connection is only about 1024-10 = 1014 or so. In other words, Linux-based communication programs allow up to 1014 simultaneous TCP connections by default.For a communication handler that wants to support a higher number of TCP concurrent connections, you must modify the soft limit (soft limit) and the hard limit (hardlim

1, modify the user process can open the number of files limitOn a Linux platform, regardless of whether you write a client or a service-side program, the highest concurrency is limited by the number of files that can be opened by the system at the same time as the user's single process (because the system creates a socket handle for each TCP connection) for high concurrent TCP connection processing. Each socket handle is also a file handle. You can us

The number of concurrent connections refers to the ability of a firewall or proxy server to handle its business information flow, is the maximum number of point-to-point connections that a firewall can handle at the same time, reflecting the ability of the firewall device to access and link state tracking for multiple connect