Dialup-Error: ERROR_PROTOCOL_NOT_CONFIGURED

When I try to login with my Internet-Provider I get sometimes (70%) of my logins the following error message:
"ERROR_PROTOCOL_NOT_CONFIGURED"
The message appears after checking username/password
I checked everything with the provider and all my settings should be ok.
It's strange that this error doesn't happen always.
Hope anyone has an idea.
Thank you
oli

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olioAsked:
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jhanceCommented:
This is often due to an error in transmission of the protocol handshake or more often by the ISP's server being overloaded and not getting back to your dialup before Win95 times out and gives up.  I'd complain at them or find another ISP.
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olioAuthor Commented:
What error in transmission of the protocol handshake do you refer to ?
Is there something the ISP could do ?
The error also happens in times where there is almost no one trying to log in at the ISP.
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jhanceCommented:
If that is the case, then it's likely a poor dial-up connection.  Can you connect reliably with other sites?
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olioAuthor Commented:
I can connect reliably to other ISP.
What do you refer to with poor dial-up connection.
Do you refer to the phone line ?
I'm using ISDN ? And it only happens with ISDN-connections.

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bbaoIT ConsultantCommented:
Try to have a low speed connection to see if it could be fixed. Sometimes when I have bad line connection, It is useful for me.
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olioAuthor Commented:
Adjusted points to 150
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Antonin011498Commented:
Folowwing Brett who gives you the right way to go through ( I think ) you can try to leave the IP Header Compression ON but Uncheck  the Enable Software Compression of the Server Properties.
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CleanupPingCommented:
olio:
This old question needs to be finalized -- accept an answer, split points, or get a refund.  For information on your options, please click here-> http:/help/closing.jsp#1 
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jhanceCommented:
I don't care.  This question is more then 5 years old!  I can't imagine that olio is still waiting for an answer....
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