I have a colleague who is dialing in to our company from
the states and he is getting the message "737 loopback was
detected" Has anybody seen this before? and how does he
get out of it?

Andy.

Hi Andy,

Have your friend check with their ISP.

Error 737 is triggered by a loopback of data involved in setting up a PPP connection after the
modem successfully CONNECTs to the remote modem.

This error may occur when making calls to ISPs that use an authentication protocol within PPP
(point-to-point protocol).

ISPs using authentication after PPP - may include/require a dial-up script or other proprietary
dialer. In some cases, a plain-text string is transmitted to the RAS, and then a PPP session is
established. If the PPP session isn't established because the local system is receiving back
the packets it is sending, error 737 may be reported.

Thanks,
Gary
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