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when i use OCI MODE , Connect is OK;

when i use Direct Mode ,Sometiems Connect is not OK;

it shows:
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connect error：NET: Network error (Windows socket error: 向一个无法连接的网络尝试了一个套接字操作。 (10051), on API 'connect')
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i want to know how to solve it.

Hello,

Please specify what you mean by 'Sometimes'.
Most likely the problem is connected with network, DNS, routing, etc. (http://msdn.microsoft.com/en-us/library ... s.85).aspx)
For example, if you set the Server name as 'name' (not as IP-address) and DNS doesn't work, you'll get this error.