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goldstein

This is most likely caused by your site having met its maximum concurrent connection limit. Shared hosting accounts are subject to the following limits:
Linux
Linux Economy - 50 Concurrent Connections
Linux Deluxe - 100 Concurrent Connections
Linux Unlimited - 200 Concurrent Connections
Windows
Windows Economy - 50 Concurrent Connections
Windows Deluxe - 100 Concurrent Connections
Windows Unlimited - 150 Concurrent Connections

MySQL connections are limited to 200 from your hosting server to the MySQL server.

MSSQL connections are limited to 100 concurrent connections.

Larger files also cause connections to remain open longer, while your site's visitors download them. Smaller files/text lead to shorter connections. As an example, a blog with fewer readers might perform fine with an economy account and its 50 concurrent connections. However, a blog with streaming media or a higher patronage would probably need more connections.

To resolve these issues, consider upgrading to a plan with a higher concurrent connection limit.

看来Linux的连接数指标都比同价格的Win的稍大点。

add.c

对的. gird主机更大点