Some people I support have connections which, while seemingly reasonably fast, often drop out. Others are rock-solid, so that a drop-out is a surprise. I'm currently supporting a pro-bono database development where the developer is in North Carolina and the installation is in Ghana. Not so surprisingly, the NC connection is solid, while the Ghana one is very slow and prone to disconnections. As we're using a server-initiated (listening client) connection from Ghana the script is potentially invaluable. I have tried (elsewhere) using ping -t to keep a connection "warm" but it didn't stop VNC from dropping out. VNC seems more prone to dropouts that Remote Desktop, which also makes up to 20 attempts to reconnect, but Remote Desktop doesn't have the Listening Client facility, which can be a godsend.
Philip Herlihy -----Original Message----- From: Alex Pelts [mailto:al...@broadcom.com] Sent: 28 September 2009 03:17 To: Philip Herlihy Cc: vnc-list@realvnc.com Subject: Re: Keep-alive script available You need to set "Disconnect idle client" in the "Connections" tab to 0. This will prevent vnc server itself from dropping connections. That is a server configuration. If connection broken for some reason it is up to tcp layer to reestablish connection. It normally can do this if link is restored within timeout time, which is about 10 minutes if I remember correctly. If you are using vpn to connect to your server, in my experience, vpn wold be the source of lost connection much more than vnc. To keep vpn going you can run some sort of IM client on the viewer side and it will periodically ping the server thus keeping connection alive. I use vnc for work and keep session going for 10-11 hours straight without any problems. Regards, Alex Philip Herlihy wrote: > That might have been a wasted few hours, writing that script, then! I'd > looked for a suitable configuration but hadn't found one. > > Do you mean to say that the connection will survive periods of network > glitch/error/whatever if this setting is used? Or is there still a role for > my script? Grateful for any further clarification you can offer on this - > as the perceived "unreliability" of VNC connections in some situations has > led me to use RDC whenever that's an option. > > Philip Herlihy > Email: phi...@herlihy.eu.com > Tel: 020 8521 9157 > Mobile: 07931 546660 > Fax: 0870 0511055 > > > -----Original Message----- > From: vnc-list-boun...@realvnc.com [mailto:vnc-list-boun...@realvnc.com] On > Behalf Of Alex Pelts > Sent: 27 September 2009 17:12 > To: Philip Herlihy > Cc: vnc-list@realvnc.com > Subject: Re: Keep-alive script available > > Or you can set timeout to 0 and server will not drop connection. > > Regards, > Alex > > > Philip Herlihy wrote: > >> One of the most useful features of VNC is the facility to set up a reverse >> connection, initiated from the server to a listening client. Providing >> > the > >> router at the client end can be configured to pass through port 5500, >> > there > >> is no need to mess with firewalls and routers at the server end. As the >> expertise is usually at the client end - that's a good deal! >> >> >> >> However, that leaves the job of maintaining the connection, re-connecting >> > as > >> necessary, at the server end. Many times I've had someone set up a >> connection only for it to drop a few minutes after they have left. >> >> >> >> I've finally (!) got a script working which provides one solution to this. >> The script, which uses only built-in NT commands (tested under XP), sets >> > up > >> a connection and then periodically monitors that it is still "live", >> automatically re-establishing the connection if it has dropped. This >> version is for a client at a location with a known IP address, but it >> > could > >> be adapted to use a domain address (including one obtained via dynamic >> > DNS). > >> >> >> If you'd like a copy, drop me a note. Beyond keeping the attribution in >> > the > >> comments, there are no strings attached. >> >> >> >> Phil Herlihy >> >> _______________________________________________ >> VNC-List mailing list >> VNC-List@realvnc.com >> To remove yourself from the list visit: >> http://www.realvnc.com/mailman/listinfo/vnc-list >> >> >> > > > > _______________________________________________ > VNC-List mailing list > VNC-List@realvnc.com > To remove yourself from the list visit: > http://www.realvnc.com/mailman/listinfo/vnc-list > > > > > _______________________________________________ VNC-List mailing list VNC-List@realvnc.com To remove yourself from the list visit: http://www.realvnc.com/mailman/listinfo/vnc-list
