tracker/udp/client.go | 3 +++

diff --git a/tracker/udp/client.go b/tracker/udp/client.go
index 077cc7a40bac83d9259e4d0c65fb417d054d1437..4664643dd244d65c958e508ce7eac15ef93d0d16 100644
--- a/tracker/udp/client.go
+++ b/tracker/udp/client.go
@@ -225,6 +225,9 @@ 		} else if dr.Header.Action == ActionError {
 			// udp://tracker.torrent.eu.org:451/announce frequently returns "Connection ID
 			// missmatch.\x00"
 			err = ErrorResponse{Message: string(dr.Body)}
+			// Force a reconnection. Probably any error is worth doing this for, but the one we're
+			// specifically interested in is ConnectionIdMissmatchNul.
+			cl.connIdIssued = time.Time{}
 		} else {
 			err = fmt.Errorf("unexpected response action %v", dr.Header.Action)
 		}