don't expire connected routers

libi2pd/NetDb.cpp

@@ -664,6 +664,8 @@ namespace data
 			if (it.second->IsUnreachable () && (total - deletedCount < NETDB_MIN_ROUTERS || isLowRate ||
 				(it.second->IsFloodfill () && totalFloodfills - deletedFloodfillsCount < NETDB_MIN_FLOODFILLS)))
 				it.second->SetUnreachable (false);
+			if (!it.second->IsUnreachable ())
+			{	
 				// find & mark expired routers
 				if (!it.second->IsReachable () && (it.second->GetCompatibleTransports (true) & RouterInfo::eSSU2V4))
 				// non-reachable router, but reachable by ipv4  SSU2 means introducers
@@ -679,6 +681,9 @@ namespace data
 					LogPrint (eLogWarning, "NetDb: RouterInfo is from future for ", (it.second->GetTimestamp () - ts)/1000LL, " seconds");
 					it.second->SetUnreachable (true);
 				}
+				if (it.second->IsUnreachable () && i2p::transport::transports.IsConnected (it.second->GetIdentHash ()))
+					it.second->SetUnreachable (false); // don't expire connected router
+			}	
 
 			if (it.second->IsUnreachable ())
 			{