Random Connection Failure to Oracle from Packages

I have a project with 18 packages in it that connect to an Oracle database to extract data from over 150 Oracle tables. Sometimes the project completes okay; sometimes it doesn't.
The 18 packages have two to four data flow steps executed one at a time, with each step extracting data from four to eight Oracle tables simultaneously and depositing the rows into SQL Server tables.
When it errors, it is always the same: "ORA-12170: TNS:Connect timeout occurred". The error could be in package 12 one night and in package 18 another night. Sometimes the project runs successfully through all 18 packages for two or three
nights.
Our network and Oracle people say that when it times out, they notice that Oracle sends a "connection okay" message, but there is no response from the SQL Server side. Then it continues to try to send the "connection okay" for about 30
seconds, upon which it times out.
Has anyone seen this problem before?
Greg

The Attunity driver is a completely different thing. I would suggest contacting them and see if there is any diagnostic data they can provide.
Also see:
http://www.attunity.com/forums/microsoft-ssis-oracle-connector/time-out-error-1576.html
PS. The error "ORA-12170" is actually coming from the driver. So it is not technically an SSIS issue, but something else.

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I'm having strange random connection failures. Are there ineffieciency in my config?

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What happens is while I'm browsing on the net over wifi, a link will at random not connect to the site, but instead fault to the ISP error page. It happens with highly reliable sites like google, or ebay, or whatever. If I direct connect to the cable modem, the problem site is immediately available.
I'm sitting <6 feet from a 871W router (with antenna). There's one router in my building and others are at my neighbors.
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    version 12.4
    no service pad
    service timestamps debug datetime msec
    service timestamps log datetime msec
    no service password-encryption
    hostname TooterTurtle
    boot-start-marker
    boot-end-marker
    logging buffered 51200 warnings
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    aaa new-model
    aaa authentication login default local
    aaa authorization exec default local
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    clock summer-time NewYork date Apr 6 2003 2:00 Oct 26 2003 2:00
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    no ip gratuitous-arps
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       dns-server 192.168.10.1
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Hi,
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Maybe this one helps.
https://community.oracle.com/message/2310374
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Regards, Dave Patrick ....
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Microsoft MVP [Windows]
Disclaimer: This posting is provided "AS IS" with no warranties or guarantees , and confers no rights.

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Manik wrote:
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<BLOCKQUOTE><font size="1" face="Verdana, Arial">quote:</font><HR>Originally posted by harry dhillon ([email protected]):
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null

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little confusion here, are you trying to tnsping sql server? tnsping is an Oracle utulity.
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thanks

After more investigation and even more chocolate, we've identified the problem and it's now working. For anyone else who strikes this problem in future, here's something to check/consider/try:
Even though Squirrel SQL Client was connecting and working ok using the MS JDBC driver (v 3.0), it recorded this in its logs:
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Robyn

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