Title: API Key: Invalid
Last modified: September 8, 2020

---

# API Key: Invalid

 *  Resolved [saeedmadarshahi](https://wordpress.org/support/users/saeedmadarshahi/)
 * (@saeedmadarshahi)
 * [5 years, 9 months ago](https://wordpress.org/support/topic/api-key-invalid-6/)
 * Hi,
    I got the api key from [https://criticalcss.com/account/api-keys](https://criticalcss.com/account/api-keys)
   and save it in the plugin. it worked for 2 days but after I disabled;e-enabled
   the cdn for my domain it now says:
 * > API Key: Invalid
   >  Something went wrong when checking your API key, make sure
   > your server can communicate with [https://criticalcss.com](https://criticalcss.com)
   > and/ or try again later.
 * while the API is correct and in API page I can see that my domain is registered.
   also I can get css from criticalcss.com so the site is visible to the server.
 * I tried a lot to del and re insert the key but it does not work. what is your
   suggestion?
    regards.
 * The page I need help with: _[[log in](https://login.wordpress.org/?redirect_to=https%3A%2F%2Fwordpress.org%2Fsupport%2Ftopic%2Fapi-key-invalid-6%2F%3Foutput_format%3Dmd&locale=en_US)
   to see the link]_

Viewing 4 replies - 1 through 4 (of 4 total)

 *  Plugin Author [Optimizing Matters](https://wordpress.org/support/users/optimizingmatters/)
 * (@optimizingmatters)
 * [5 years, 9 months ago](https://wordpress.org/support/topic/api-key-invalid-6/#post-13374952)
 * Based on the error-message there is an issue in the outgoing connection from 
   your server to the criticalcss.com server saeedmadarshahi. usually this is due
   to a security plugin/ component not allowing the request, maybe check if connections
   to criticalcss.com at below addresses are allowed?
 *     ```
       Name:	criticalcss.com
       Address: 172.67.197.101
       Name:	criticalcss.com
       Address: 104.27.160.117
       Name:	criticalcss.com
       Address: 104.27.161.117
       Name:	criticalcss.com
       Address: 2606:4700:3037::681b:a075
       Name:	criticalcss.com
       Address: 2606:4700:3035::681b:a175
       Name:	criticalcss.com
       Address: 2606:4700:3032::ac43:c565
       ```
   
 *  Plugin Author [Optimizing Matters](https://wordpress.org/support/users/optimizingmatters/)
 * (@optimizingmatters)
 * [5 years, 8 months ago](https://wordpress.org/support/topic/api-key-invalid-6/#post-13429476)
 * any news saeedmadarshahi ?
 *  Thread Starter [saeedmadarshahi](https://wordpress.org/support/users/saeedmadarshahi/)
 * (@saeedmadarshahi)
 * [5 years, 8 months ago](https://wordpress.org/support/topic/api-key-invalid-6/#post-13429498)
 * Hi,
 * Thank you. I gave the above IP to my server and asked them to whitelist them 
   in the firewall. It seems it worked for now.
 *  Plugin Author [Optimizing Matters](https://wordpress.org/support/users/optimizingmatters/)
 * (@optimizingmatters)
 * [5 years, 8 months ago](https://wordpress.org/support/topic/api-key-invalid-6/#post-13429538)
 * happy to read so. enjoy your Sunday!
 * frank

Viewing 4 replies - 1 through 4 (of 4 total)

The topic ‘API Key: Invalid’ is closed to new replies.

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## Tags

 * [api key](https://wordpress.org/support/topic-tag/api-key/)

 * 4 replies
 * 2 participants
 * Last reply from: [Optimizing Matters](https://wordpress.org/support/users/optimizingmatters/)
 * Last activity: [5 years, 8 months ago](https://wordpress.org/support/topic/api-key-invalid-6/#post-13429538)
 * Status: resolved