# Pinegrow 2.951 - PRO was unable to start its internal webserver in Mac OS Sierra **URL:** \ **Category:** General\ **Created:** [April 22, 2017, 7:07pm UTC](https://forum.pinegrow.com/t/pinegrow-2-951-pro-was-unable-to-start-its-internal-webserver-in-mac-os-sierra/880 "2017-04-22T19:07:11Z")\ **Posts on this page:** 10\ **Page:** 1
**Author:** ![Cat](https://avatars.discourse-cdn.com/v4/letter/c/d07c76/32.png) [@Cat](https://forum.pinegrow.com/u/Cat)\ **Post date:** [April 22, 2017, 7:07pm UTC](https://forum.pinegrow.com/t/pinegrow-2-951-pro-was-unable-to-start-its-internal-webserver-in-mac-os-sierra/880/1 "2017-04-22T19:07:11Z")
## **Pinegrow doesn’t work in Mac OS Sierra 10.12.4.** It show a alert that say: > Pinegrow was unable to start its internal webserver. What should I do to make it work? P.D: firewall is off, I don’t use antivirus apps. ---
**Author:** ![Bio-Designer](https://yyz2.discourse-cdn.com/flex036/user_avatar/forum.pinegrow.com/bio-designer/32/541_2.png) [@Bio-Designer](https://forum.pinegrow.com/u/Bio-Designer)\ **Post date:** [April 22, 2017, 7:28pm UTC](https://forum.pinegrow.com/t/pinegrow-2-951-pro-was-unable-to-start-its-internal-webserver-in-mac-os-sierra/880/2 "2017-04-22T19:28:44Z")
> [@Cat](#): > > Mac OS Sierra 10.12.4 I’m on same system version same pinegrow version all work as expected. Have you tried to uninstall / reinstall ? ---
**Author:** ![Bio-Designer](https://yyz2.discourse-cdn.com/flex036/user_avatar/forum.pinegrow.com/bio-designer/32/541_2.png) [@Bio-Designer](https://forum.pinegrow.com/u/Bio-Designer)\ **Post date:** [April 22, 2017, 7:28pm UTC](https://forum.pinegrow.com/t/pinegrow-2-951-pro-was-unable-to-start-its-internal-webserver-in-mac-os-sierra/880/3 "2017-04-22T19:28:57Z")
if yes send a support ticket 😉 ---
**Author:** ![Cat](https://avatars.discourse-cdn.com/v4/letter/c/d07c76/32.png) [@Cat](https://forum.pinegrow.com/u/Cat)\ **Post date:** [April 22, 2017, 9:56pm UTC](https://forum.pinegrow.com/t/pinegrow-2-951-pro-was-unable-to-start-its-internal-webserver-in-mac-os-sierra/880/4 "2017-04-22T21:56:27Z")
I tried to uninstall / reinstall don’t work. Also, send support ticket, but there is not solution. ---
**Author:** ![Emmanuel](https://yyz2.discourse-cdn.com/flex036/user_avatar/forum.pinegrow.com/emmanuel/32/6294_2.png) [@Emmanuel](https://forum.pinegrow.com/u/Emmanuel)\ **Post date:** [April 23, 2017, 12:31pm UTC](https://forum.pinegrow.com/t/pinegrow-2-951-pro-was-unable-to-start-its-internal-webserver-in-mac-os-sierra/880/5 "2017-04-23T12:31:22Z")
Pinegrow uses internal webserver to access local HTML files. From the menu Support \> Settings \> Internal Webserver ports \> select any free port on your system (Try 40000 and above) and make sure that incoming connections are not blocked by a firewall. Note: Each Pinegrow window needs a free port. Each subsequent window will look for the first free port above the one specified in the settings. ---
**Author:** ![Cat](https://avatars.discourse-cdn.com/v4/letter/c/d07c76/32.png) [@Cat](https://forum.pinegrow.com/u/Cat)\ **Post date:** [April 23, 2017, 6:53pm UTC](https://forum.pinegrow.com/t/pinegrow-2-951-pro-was-unable-to-start-its-internal-webserver-in-mac-os-sierra/880/6 "2017-04-23T18:53:48Z")
HI! Try port 4000; firewall off and restart system. It does not work… ---
**Author:** ![Bio-Designer](https://yyz2.discourse-cdn.com/flex036/user_avatar/forum.pinegrow.com/bio-designer/32/541_2.png) [@Bio-Designer](https://forum.pinegrow.com/u/Bio-Designer)\ **Post date:** [April 23, 2017, 8:05pm UTC](https://forum.pinegrow.com/t/pinegrow-2-951-pro-was-unable-to-start-its-internal-webserver-in-mac-os-sierra/880/7 "2017-04-23T20:05:39Z")
Maybe Emmanuel make a mistake and forget one zero mine is configured as : Internal Webserver hostname : 127.0.0.1 Internal Webserver ports : **40000** (Pinegrow uses internal webserver to access local HTML files. Select a free port and make sure that incoming connections are not blocked by a firewall. Each Pinegrow window needs a free port. Each subsequent window will look for the first free port above the one specified here.) SO try **40000** 40001, 40002 etc… until you find one port who work _Autorize Pinegrow incoming and out coming on your MAC firewall and your software firewall it’s easy if you have little snitch to do that_ ---
**Author:** ![Cat](https://avatars.discourse-cdn.com/v4/letter/c/d07c76/32.png) [@Cat](https://forum.pinegrow.com/u/Cat)\ **Post date:** [April 23, 2017, 10:39pm UTC](https://forum.pinegrow.com/t/pinegrow-2-951-pro-was-unable-to-start-its-internal-webserver-in-mac-os-sierra/880/8 "2017-04-23T22:39:32Z")
Uf, I try until port 40015 and it don’t work 😔 I searched the open ports on my system. I only found one port, which did not work. ---
**Author:** ![Emmanuel](https://yyz2.discourse-cdn.com/flex036/user_avatar/forum.pinegrow.com/emmanuel/32/6294_2.png) [@Emmanuel](https://forum.pinegrow.com/u/Emmanuel)\ **Post date:** [April 24, 2017, 10:11am UTC](https://forum.pinegrow.com/t/pinegrow-2-951-pro-was-unable-to-start-its-internal-webserver-in-mac-os-sierra/880/9 "2017-04-24T10:11:11Z")
Then, I guess you have to check & authorize Pinegrow on your computer firewall/AV. ---
**Author:** ![Cat](https://avatars.discourse-cdn.com/v4/letter/c/d07c76/32.png) [@Cat](https://forum.pinegrow.com/u/Cat)\ **Post date:** [April 24, 2017, 12:09pm UTC](https://forum.pinegrow.com/t/pinegrow-2-951-pro-was-unable-to-start-its-internal-webserver-in-mac-os-sierra/880/10 "2017-04-24T12:09:48Z")
Everything done with firewall turned off. I don’t use antivirus.