# Bug on certbot when trying to add 2 sites to a server

**Project:** Bugs | **Board:** Planned | **Votes:** 2
**URL:** https://roadmap.ploi.io/projects/7-bugs/items/834-bug-on-certbot-when-trying-to-add-2-sites-to-a-server

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When adding to sites into a server, the certificate faild because


2023-10-17 17:51:29,822:DEBUG:certbot._internal.lock:A lock on /var/log/letsencrypt/.certbot.lock is held by another process.

The system should be able to have different process to handle this or a queue. Or let me know before I click the button or use the API.



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## Comments

**Dennis** (2023-10-31T16:36:19+00:00):
Good call! We can put a delay on this with checks if previous instances have finished.