PRB: RasDial() Takes Longer to Dial Out (140018)
The information in this article applies to:
- Microsoft Win32 Software Development Kit (SDK) 3.51
- Microsoft Win32 Software Development Kit (SDK) 3.5
This article was previously published under Q140018 SYMPTOMS
RasDial() takes more time to dial and authenticate a RAS (remote access
server) user if the RAS server being dialed is using older RAS protocols
and if the application is not using a phone book entry while calling
RasDial().
CAUSE
Windows NT versions 3.5 and 3.51 use PPP (point-to-point protocol) as the
default protocol for dialing out. However, older versions of RAS servers
namely, RAS servers for Windows NT version 3.1 and point-to-point servers
for Windows for Workgroups do not implement the PPP protocol.
When an application calls RasDial() without specifying a phonebook entry,
RasDial() uses the default phonebook entry settings. The default framing
protocol for Windows NT versions 3.5 and 3.51 is PPP, so that is tried
first. If PPP doesn't work, the old RAS framing protocol is tried. The
failed attempt to connect with PPP accounts for the delay.
When a user creates a phonebook entry and dials an older RAS server, RAS
on the Windows NT client tries PPP as the framing protocol, which
eventually times out, and RAS falls back to old RAS protocol. RasDial()
marks the phonebook entry so that the next time it is dialed old RAS
protocol is tried first with fallback to PPP. Thus, the user sees the same
delay on the first call, but all subsequent calls are quick.
RESOLUTION
Application programmers can create an entry with RASPHONE and override the
phone number at dial time, thus using the entry as a template with options
appropriate for the down-level server. If it is known that the server is
an older RAS server and will not be upgraded, you can clear all three check
boxes for all three protocols. Using RASPHONE, on the Edit menu, click
Network, and then clear the check boxes in the PPP group. This trick forces
old RAS protocol and eliminates the training call.
STATUS
This behavior is by design.
| Modification Type: | Major | Last Reviewed: | 2/25/2004 |
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| Keywords: | kbAPI kbnetwork kbprb KB140018 |
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