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Subject: Re: EXP-00056, ORA-12638 & Scheduled nightly exports under Oracle 8.1.6 and Windows 2000 server SP2
Date: 8 Aug 2002 21:27:01 -0700
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Replace sqlnet.authentication_services = (NTS)   with
          sqlnet.authentication_services = (BEQ,NONE)

This is a post from METALINK which may help

From: Oracle, Bharat Rajani 23-Jan-02 10:14 
Subject: Re : Unable to complete a designer application export 


Hi, 

This was due to 1 Bug in Oracle 8.1.6 which was fixed in 8.1.7. 
The only workaround is to change sqlnet.authentication_services as
already told by me.
Try to change it in sqlnet.ora to 
sqlnet.authentication_services = (BEQ,NONE) . 

If it won't help then please log a TAR so that you can get a fix in
8.1.6.

Regards 
Bharat Rajani