On Fri, 2014-09-26 at 10:07 +0200, Niels Peen wrote: > Hi all, > > What could be the cause of a "Error setting up DTLS? error? > > I?m having a really hard time troubleshooting its cause as it?s very inconsistent. It will happen 10+ times, then suddenly (without making any changes) disappear and not happen for days. > > It happens only on Windows and only with OpenConnect. When I try OpenConnect on Android or AnyConnect on Windows/Android to the same server there are is no issue. > 2014-09-26 11:27 Error setting up DTLS This error is printed when openconnect_setup_dtls() fails. I'd have expected another log message before that from libopenconnect. The fact that there was no message is maybe because there are some perrors() involved, or there is a timeout (more likely) which is printed under PRG_DEBUG by libopenconnect. > It?s my impression - but this may just be coincidence - that more distant/slower servers suffer from the error less often. Could this be a timing issue of some kind? The more lost packets from the server the more likely a timeout could occur. The current value for DTLS is 12 seconds and given that the wait time doubles per lost packet it would take 4 lost packets for this error to pop up. I had the impression though that openconnect will retry connecting using DTLS isn't that the case? regards, Nikos
