Packet received fails when trying to connect to database

Dear experts,
i always received an error message: Packet Received Failed whenever i tried to connect to my 9i database. Once a while i will b able to connect without problem but sometimes is very annoying that i keep receiving this error and i have to retries a lot of time to connect depending on my luck.
Does anyone have any idea what could be wrong here?
Many thanks in advance for your advise.

me, too.
I installed Oracle 10g for windows on PC1
and Developer/2000 Forms 5.0.6.8 + sql*net client 2.3.4.0.0 on PC2
When I tried to connect to database by using SQL*Plus 3.3.4.0.0 the first time to connect is ok (but not fast as normal situation)
after disconnect the SQL*Plus and tried to made another connection immediately, the [ORA-12637 packet receive failed] appears.
after sometime, it may be success to connect again.
I used to disable all Firewall and the problem still happen.
Any one can help please?

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