From 8ad14d0a2cb55d3969e585f1a4d65107606ce29e Mon Sep 17 00:00:00 2001
From: Oli <gugger@gmail.com>
Date: Wed, 22 Oct 2025 12:53:00 +0200
Subject: [PATCH] zombierecovery: catch another server error for re-try

Re-try the server query for another possible error message.
---
 cmd/chantools/zombierecovery_findmatches.go | 20 +++++++++++++++++++-
 1 file changed, 19 insertions(+), 1 deletion(-)

diff --git a/cmd/chantools/zombierecovery_findmatches.go b/cmd/chantools/zombierecovery_findmatches.go
index 03f0ee6..1228340 100644
--- a/cmd/chantools/zombierecovery_findmatches.go
+++ b/cmd/chantools/zombierecovery_findmatches.go
@@ -379,7 +379,7 @@ func fetchChannels(client *graphql.Client, pubkey string) ([]*gqChannel,
 		var query gqGetNodeQuery
 		err := client.Query(context.Background(), &query, variables)
 		if err != nil {
-			if strings.Contains(err.Error(), "Too many requests") {
+			if isServerErr(err) {
 				time.Sleep(1 * time.Second)
 				continue
 			}
@@ -401,6 +401,24 @@ func fetchChannels(client *graphql.Client, pubkey string) ([]*gqChannel,
 	return channels, nil
 }
 
+func isServerErr(err error) bool {
+	if err == nil {
+		return false
+	}
+
+	errStr := err.Error()
+	switch {
+	case strings.Contains(errStr, "Too many requests"):
+		return true
+
+	case strings.Contains(errStr, "error code: 520"):
+		return true
+
+	default:
+		return false
+	}
+}
+
 func identifyPeer(channel *gqChannel, node1 string) string {
 	if channel.Node1 == node1 {
 		return channel.Node2