SP2-0920: HTTP error 'failed to read TCP connection' on attempt to open URL

Hello,

I want to use in sqlplus 11.2.0.1 following:

http://<servername.domainname:portnumber>/grant.sql;

but receive

SP2-0920: HTTP error 'failed to read TCP connection' on attempt to open URL

any ideas? Do we have new parameters, settings for sqlplus?

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I tested in sqlplus 10.2.0.4 and 11.1.0.7 the same and receive a query result.

thanks Hendrik