ORA-12571: TNS:packet writer failure

I am using TOAD 8.6.1 to connect to an oracle database.  I have already done a tnsping and everything came back ok.  But when i try to connect to this particular schema i get 'ORA-12571: TNS:packet writer failure' , when i hit ok, it allows me to query the database but not use the schema browser (to see functions, procedures, etc).  I have verified my TNSNAME.ORA file is ok (verified by the tnsping).  Any ideas why i may be getting this or how it can be fixed?
pscharAsked:
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MohanKNairConnect With a Mentor Commented:
The problem can be due to loss of Network connectivity in between.
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MohanKNairCommented:
Edit sqlnet.ora file with
SQLNET.AUTHENTICATION_SERVICES= (NONE)
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pscharAuthor Commented:
thats already the case, still get the error
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MohanKNairCommented:
Are you able to connect using sql*plus using the TNS alias?
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MohanKNairCommented:
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pscharAuthor Commented:
no unable to connect via sql+
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pscharAuthor Commented:
correction - i am able to login with sql+
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pscharAuthor Commented:
let me guess . . .talk to my sys admin?
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