Augusto, The UniRPC protocol hanging when contacted by other network protocols working on the same TCP port is not exactly what we could name a "bug". But, for the very true reasons you exposed, enhancements have been made in UniRPC daemon ("unirpcd" executable) to handle smoothly the case of unexpected packets causing the daemon to hang, as the UniRPC "applicative" protocol doesn't know about any of the others high-level protocols such as "telnet", "ftp", and so on.
A new "unirpcd" parameter = -timeout tt, with "tt" in seconds allows the UniRPC daemon to handle smoothly this situation. We recommend the timeout value to be the smallest as your network can support, because for the duration of the timeout, the UniRPC daemon is actually hanging, but in a controlled manner, and no more UniRPC connections can be accepted. A value of 15 seconds seems generally the largest acceptable value on most sites, so it could be reduced on purpose. Note that this parameter exists for UniVerse on Windows platform starting at release 10.1.23 for releases 10.1.x and 10.2.3 for releases 10.2.x. The procedure to get it enabled through Windows Services Manager is documented in the "patchlist" file accessible on : https://www-927.ibm.com/software/data/u2/support/u2techconnect/downloads/readme/UV-10.1.23.zip Have to look at "Issue # 9074". On UNIX platforms, the "-timeout" parameter was altready existing in the early releases 10.0.x (and UniData 6.0.x), (and it's much easier to have it enabled at system command line !). Hope this will help. P.S: The answer here is one more reason to attend to U2U in IBM Bedfont Lakes (Feltham) as my manager suggested !... Regards, Herve' Balestrieri > Hi all. > > If you do a telnet against any Universe server on port 31438 (I have tested > it on Universe 10.0.10 in Windows, Universe 10.0.20 in Linux and Universe > 10.0.6 in HP-UX), you will have something very similar to a Denial Of > Service on this port 31438: > - all previous UVRPC established sessions keep on working without > problem, but > - any subsequent tries to start new UVRPC sessions, will timeout with > "Error returned from connect = 81015". > > The problem desappears when the PC client closes the telnet session. (Or you > can restart UniVerse or the whole server...) > > Could someone tell me if is it a normal behaviour or is it a unirpcd bug? > Is there any way of detect or avoid this kind of sessions? > Could it be the same problem that some viruses (like Blaster) causes on > UVRPC of Universe Servers? > > Any help will be apreciated. > > Regards, > ______________________________ > Augusto Alonso Alonso > IT Manager > Quiter Servicios Informaticos S.L. > [EMAIL PROTECTED] > www.quiter.com > ______________________________ ------- u2-users mailing list u2-users@listserver.u2ug.org To unsubscribe please visit http://listserver.u2ug.org/