Always use a fresh connection for longpoll as prolonged persistent connections can fail for many reasons.
diff --git a/cgminer.c b/cgminer.c
index 0c455f1..6447902 100644
--- a/cgminer.c
+++ b/cgminer.c
@@ -3547,6 +3547,12 @@ new_longpoll:
json_t *val, *soval;
gettimeofday(&start, NULL);
+
+ /* Longpoll connections can be persistent for a very long time
+ * and any number of issues could have come up in the meantime
+ * so always establish a fresh connection instead of relying on
+ * a persistent one. */
+ curl_easy_setopt(curl, CURLOPT_FRESH_CONNECT, 1);
val = json_rpc_call(curl, lp_url, pool->rpc_userpass, rpc_req,
false, true, &rolltime, pool, false);
if (likely(val)) {