Ras Error 756
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Willi Guest For an application, which has to acquire data automatically from different ras-servers at the same time (of course with multiple modems), the RAS-functionality is needed. In general, it works fine, even with more than one connection at the same time. The application is in C#, we're using a RAS-wrapper-class, which works fine. But when a connection interrupts, it's not possible anymore, to dial (API RasDial) again with the device - error 756 is raised, which means, that the connection is already established, but http://superuser.com/questions/448392/rasdial-error-756-only-solved-by-rebooting it isn't. With EnumConnections it's not listed, so I can't call a HangUp on that connection. The only solution now is a restart, which isn't that good for a standalone system without user-interaction... System is W2kpro. Maybe someone out there can help me; I found some postings in Google-Groups, where some users had the same problem, but no good answer was given... Bruno http://www.pcreview.co.uk/threads/rasdial-throws-error-756-line-already-in-use.1574248/ Bruno Willi, Jul 28, 2003 #1 Advertisements Sumit Chakravarty [MS] Guest Hi Bruno, That KB article describes a situation where the user stops RRAS while a connection is up, thus orphaning the connection. I assume you're not doing that in your code somewhere. Perhaps you could enable RAS logging as below and make the logs available? To enable logging, type the following in a cmd.exe window: netsh ras set tracing * enabled Now let your application connect, and run until the point of first failure. Now you can turn tracing off: netsh ras set tracing * disabled The log files are in a directory named 'tracing' under the Windows directory. -sumit -- This posting is provided "AS IS" with no warranties, and confers no rights. "Bruno Willi"
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is already being dialed rated by 0 users This post has 3 Replies | 0 Followers jackjohnson boston Since 2/18/2004 Posts 8 Reputation 160 Reply jack johnson (jackjohnson) Posted: 2/24/2004 10:45 AM rated by 0 users I can connect and disconnect a ras connection.If I make the connection, then kill the program, I get this error when I open and try to connect again.I tried listing all connections then killing them, but it seems to be a problem with the modemthinking it is busy. I even tried disconnecting the phone for a few minutes at a time.The only solution seems to be to restart the computer.I do not want to do this.How can I solve this in VB?Thanks,Jared | Post Points: 35 McGenius New York, NY Since 6/3/2003 Posts 2,559 Reputation 13,695 Reply Mc Genius (McGenius) replied on 2/24/2004 2:04 PM rated by 0 users Can you present your exact code so we can take a look at it. Thanks. ________________________________Programming and miracle cannot coexist …McG :p | Post Points: 5 jackjohnson boston Since 2/18/2004 Posts 8 Reputation 160 Reply jack johnson (jackjohnson) replied on 2/25/2004 12:36 PM rated by 0 users There isn't too much code to show, but here goes.I have a few wrapper functions, but the problem is with the api, not my code, (I think).This makes a connection, and works well.lngnRet = fcnRasDial(RasNumber, "", _RasUser, RasPass, "", _hRasConn)This ends the connection, and works well.lngnRet = fcnRasHangUp(hRasConn)I can connect and disconnect all day.The problem is if I kill my program after connecting, without disconnecting,the next time I run the program, I can't connect. It seems likethe some place my computer thinks it still controls the modem.I get error:754 the connection is already being dialedThe only solution seems to be to reboot.Thanks | Post Points: 5 drydo Littlethorpe, Leicestershire Since 9/2/2002 Posts 8,853 Reputation 59,270 Reply drydo (drydo) replied on 2/26/2004 1:38 AM rated by 0 users In short, you need to clean up your RAS connection properly. Personally, I created a specific func