I have been having this odd issue were all of my agents report that they are 'offline' or in 'warning'. The only real way I have found to fix this is to reboot the Solarwinds App server or restart all of the Solarwinds services and that usually fixes things. The odd thing is it looks like the connection doesn't drop but I get warnings on all of the agents. Hoping someone else has this same issue. Support has been working on this for quite some time and nothing seems to be working. Thanks!