--- title: "TYPO3 & Solr: Protection against DDOS attacks | Guide" url: "https://www.dkd.de/en/blog/ddos-recommended-action-solr-for-typo3/" description: "Protect your TYPO3 website from DDOS with Solr: identify risks, web server hardening, query limits, caching, WAF, rate limiting & monitoring." image: "https://www.dkd.de/_assets/processed/OC9B_zakf18BQEoDaeiz7HDf_BcZNkloKaOd6OEVRpA/q:85/w:1366/h:768/fn:Y3NtX2RrZC1kaWdpdGFsYWdlbnR1ci1UWVBPM19fX1NvbHJfdm9yX0RET1MtQW5ncmlmZmVuX3NjaHVldHplbi1ncmVlbi1sb2dvX18yX18wNzhmZWM1NGI2:t/cb:e2812365b0bb8bec4213a3e99f0617b3a6e8b430/bG9jYWw6L2ZpbGVhZG1pbi9CaWxkZXIvQmxvZy9Db250ZW50LzIwMjUvZGtkLWRpZ2l0YWxhZ2VudHVyLVRZUE8zX19fU29scl92b3JfRERPUy1BbmdyaWZmZW5fc2NodWV0emVuLWdyZWVuLWxvZ29fXzJfLnBuZw" date: 2025-10-28 modified: 2026-10-09 --- # TYPO3 & Solr: Protection against DDOS attacks | Guide 11.09.2025 Protect TYPO3 & Solr from DDOS attacks ============================================ ![Green calculators, a screen and other tools behind a shield that protects them from arrows](https://www.dkd.de/_assets/processed/xOEny8-wCOKE_Yctq-jVIaAGaH2XOUxVwNKm1o_5WVI/q:85/w:592/h:333/fn:Y3NtX2RrZC1kaWdpdGFsYWdlbnR1ci1UWVBPM19fX1NvbHJfdm9yX0RET1MtQW5ncmlmZmVuX3NjaHVldHplbi1ncmVlbi1sb2dvX18yX19kODk2YmRhNzFk:t/cb:e2812365b0bb8bec4213a3e99f0617b3a6e8b430/bG9jYWw6L2ZpbGVhZG1pbi9CaWxkZXIvQmxvZy9Db250ZW50LzIwMjUvZGtkLWRpZ2l0YWxhZ2VudHVyLVRZUE8zX19fU29scl92b3JfRERPUy1BbmdyaWZmZW5fc2NodWV0emVuLWdyZWVuLWxvZ29fXzJfLnBuZw "Protecting TYPO3 & Solr from DDOS attacks") Preventive measures for greater security ---------------------------------------- In recent weeks, as a [TYPO3 agency](https://www.dkd.de/en/typo3-agency/ "dkd – Your certified TYPO3 agency in Frankfurt am Main"), we have observed a worrying increase in DDOS attacks on TYPO3 websites with [connected Solr search](https://www.typo3-solr.com "Learn everything you need to know about Apache Solr for TYPO3"). These attacks can not only lead to downtime, but also consume considerable resources and severely impair the performance of your TYPO3 website. Identifying DDOS risks in TYPO3 Solr ------------------------------------ DDOS (Distributed Denial of Service) attacks aim to crash servers by overloading them with requests. In TYPO3 installations with Solr integration, search functions are particularly affected, as they often generate resource-intensive queries. The combination of TYPO3 and Solr offers attackers several attack vectors: - Overloading the Solr servers with massive search queries - Exhausting TYPO3 resources with complex queries - Exploiting unprotected endpoints Optimise web server configuration --------------------------------- Depending on whether you run your TYPO3/Solr installation on nginx, Apache or another system, the recommended protective measures and the type of implementation may differ. To find the optimal solution for you, our Team of Solr experts is always available to advise you and support you with implementation. Solr-specific security measures ------------------------------- Your Solr installation is secured on three levels: *Access restriction:* Solr endpoints should never be directly accessible from the internet. *Query limits:* Implementation of limits for search parameters and result sets. *Caching strategies:* Aggressive caching of frequent search queries reduces server load. TYPO3-specific optimisations ---------------------------- At the TYPO3 level, these configurations enhance protection: *RealURL/Route Enhancer:* Clean URL structures make automated attacks more difficult *Extension configuration:* Proper configuration of the ext:solr extension with appropriate timeouts *Monitoring:* Implementation of monitoring tools for early detection ### Recommended actions for operators *Immediate measures* Start by thoroughly reviewing your current web server configuration to identify potential vulnerabilities. Then implement rate limiting for all search functions to limit the number of requests per unit of time. Also set up comprehensive monitoring of Solr server performance so that you can detect anomalies at an early stage. *Medium-term strategies* For enhanced protection, you should implement a web application firewall (WAF) that filters malicious requests before they reach your servers. Additionally, use CDN services with integrated DDOS protection to distribute the load and ward off attacks. Establish [regular security audits](https://shop.dkd.de/typo3-systemanalyse "Book your TYPO3 system analysis now!") of your TYPO3/Solr installation to identify and close new vulnerabilities in a timely manner. *Long-term security strategy* Build redundant infrastructures that ensure the availability of your services even in the event of partial failures. Implement automated incident response processes that can initiate immediate countermeasures when attacks are detected. Invest in the long-term training of your technical team in security best practices to strengthen security awareness and improve responsiveness. ### When is professional help advisable? Implementing effective DDOS protection measures requires in-depth knowledge of both the TYPO3/Solr architecture and modern security technologies. In more complex environments or in the event of attacks that have already occurred, it is advisable to work with specialised security experts. #### Proactive protection is crucial DDOS attacks on TYPO3/Solr installations are on the rise, but with the right preventive measures, most attacks can be successfully repelled. The key lies in a multi-layered security strategy that takes effect at both the web server and application levels. ***Important:*** Don't wait until your TYPO3 website is attacked. Preventive measures are significantly less expensive than repairing the damage after a successful attack. Do you need assistance implementing these protective measures? Our team of experts is happy to help. [Arrange a free security consultation!](https://www.dkd.de/en/contact/ "Your contact to the Solr team of experts!") ### Write comment ### Comments No Comments #### Tags - [\#apachesolr](https://www.dkd.de/de/blog/tag/apache-solr/) - [\#security](https://www.dkd.de/de/blog/tag/security/) - [\#Solr](https://www.dkd.de/de/blog/tag/solr/) - [\#TYPO3](https://www.dkd.de/de/blog/tag/typo3/)