--- a/src/openvpn/ssl_verify_openssl.c	2018-04-24 10:12:55.000000000 +0300
+++ b/src/openvpn/ssl_verify_openssl.c	2018-12-11 18:08:42.829143374 +0300
@@ -83,8 +83,17 @@
                 X509_STORE_CTX_get_error_depth(ctx),
                 X509_verify_cert_error_string(X509_STORE_CTX_get_error(ctx)),
                 subject);
-            ret = 1;
-            goto cleanup;
+            goto verify_cert;
+        }
+
+        /* Log and ignore expired certificate errors (MNPP Saturn patch) */
+        if (X509_STORE_CTX_get_error(ctx) == X509_V_ERR_CERT_HAS_EXPIRED)
+        {
+            msg(D_TLS_DEBUG_LOW, "VERIFY WARNING: depth=%d, %s: %s",
+                X509_STORE_CTX_get_error_depth(ctx),
+                X509_verify_cert_error_string(X509_STORE_CTX_get_error(ctx)),
+                subject);
+            goto verify_cert;
         }
 
         /* Remote site specified a certificate, but it's not correct */
@@ -99,6 +108,7 @@
         goto cleanup;
     }
 
+verify_cert:
     if (SUCCESS != verify_cert(session, current_cert, X509_STORE_CTX_get_error_depth(ctx)))
     {
         goto cleanup;