|  | @@ -4777,6 +4777,12 @@ parse_port_config(smartlist_t *out,
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				|  |  |      else
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				|  |  |        got_zero_port = 1;
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				|  |  |  
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				|  |  | +    if (ipv4_traffic == 0 && ipv6_traffic == 0) {
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				|  |  | +      log_warn(LD_CONFIG, "You have a %sPort entry with both IPv4 and "
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				|  |  | +               "IPv6 disabled; that won't work.", portname);
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				|  |  | +      goto err;
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				|  |  | +    }
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				|  |  | +
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				|  |  |      if (out && port) {
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				|  |  |        port_cfg_t *cfg = tor_malloc_zero(sizeof(port_cfg_t));
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				|  |  |        tor_addr_copy(&cfg->addr, &addr);
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