# Limitations

The following are a few limitations to consider while using CDN:

* **Limited Points of Presence (PoPs):** CDN currently offers network edge servers focused on the European region and will soon extend the PoPs to other locations.
* **Restricted Customizations:** You can only turn the Caching and WAF settings on or off. The option to customize these in the routing rule is not available.
* **Distributions:** A maximum of twenty distributions can be created per contract. If the quota needs to be increased, contact [<mark style="color:blue;">IONOS Cloud Support</mark>](https://docs.ionos.com/cloud/support/general-information/contact-information).
* **Routing Rules:** A maximum of 25 routing rules can be added for a distribution.
* **Certificate Authority Support:** CDN trusts and accepts SSL/TLS certificates issued by recognized and reputable Certificate Authorities (CAs) to ensure high security and reliability. Examples of commonly supported CAs include, but are not limited to:
  * **GeoTrust**
  * **Let's Encrypt intermediate certificates:**
    * R5
    * R6
    * R10
    * R11
    * R12
    * R13
    * R14
  * **GlobalSign**

{% hint style="info" %}
**Note:** Self-signed certificates are not accepted, as security policies require certificates to be issued by established and trusted authorities.
{% endhint %}