It was removed to prevent exposure as a security attack vector. Long story short, in Tomcat 9.0.31 (and onward), the AJP connector is not going to be enabled by default. I must say, though, that this is just a blog about Olaf's efforts, I'm now just playing Watson to his Holmes. Since I'm a big fan of using AJP to connect Apache HTTPd and Tomcat, I thought I'd share what he found with you. Update: What maybe we didn't know, Tomcat 9.0.31 (and other versions of Tomcat 6, 7, 8 and 8.5) were all being fixed to address a newly identified attack vector against Tomcat nicknamed Ghostcat: And as you're trying to forward to a non-loopback address, there'd be no way to reach the server this way.Īn anonymous editor of this answer suggested tAttribute("address", "0.0.0.0"), but personally, I'd prefer to keep it in server.xml: Connectors typically aren't configured and changed at runtime, and having your administrators editing a textfile is so much more convenient in day-to-day-operations.My friend, Olaf Kock, recently shared with me that he had struggled with and resolved an issue after moving to Tomcat 9.0.31 when using AJP. In 8.5.51 onwards, the default listen address of the AJP Connector was changed to the loopback address rather than all addresses.Ĭombining both: You never set the listening address in your code - so you might be using the default. However, your code is Connector connector = new Connector("AJP/1.3") Īnd later on you state that you know about this breaking change I've never seen a connector being set up in code like this, it's rather been declared in server.xml Particular attention shouldīe paid to the values used for the address, secret, secretRequired andĪllowedRequestAttributesPattern attributes. Use of the AJP protocol requires additional security considerationsīecause it allows greater direct manipulation of Tomcat's internalĭata structures than the HTTP connectors. Reference: Apache Tomcat 8 Configuration Reference ((AbstractAjpProtocol)connector.getProtocolHandler()).setSecretRequired(false) Otherwise the requests will fail with 403. If yes, then set the "secret" property as well. Use "secretRequired" property to define if a secret is required to be exchanged with the HTTP server so as to allow requests via ajp. Requests with unrecognized request attributes will be rejected with a 403 response: tProperty("allowedRequestAttributesPattern",".*") Use below property to enable all types of request attributes (unless you have the header info, in that case enable the specific ones). Use below listed "address" property to expand the listening range to not only the loopback address tProperty("address","0.0.0.0") // OR tProperty("address","::") But after this update, default behavior is that the AJP connector is willing to accept requests only made as localhost (loopback). Prior to this update, the tomcat AJP connector was willing to accept requests from any IP address, and so it wasn't required to explicitly specify "address" property. In 8.5.51 onwards, the default listen address of the AJP Connector wasĬhanged to the loopback address rather than all addresses. tProperty("address","0.0.0.0") ĬtProperty("allowedRequestAttributesPattern",".*") Adding below mentioned properties to the ajp connector helped my case. I faced a similar issue upon upgrading the tomcat version. Is what causing me this problem but I don't know how to solve it. In 8.5.51 onwards, the default listen address of the AJP Connector was changed to the loopback address rather than all addresses. O.a.c.c.StandardEngine : Starting Servlet engine: O.a.c.c.StandardService : Starting service O.a.c.a.AjpNioProtocol : Initializing ProtocolHandler O.a.c.h.Http11NioProtocol : Initializing ProtocolHandler In the app.properties : =8500Īnd this is tomcat logs : o.s.b.w.e.t.TomcatWebServer : Tomcat initialized with port(s): 8080 (http) 8500 (http) ((AbstractAjpProtocol) connector.getProtocolHandler()).setSecretRequired(false) This is my spring boot tomcat's configuration Connector connector = new Connector("AJP/1.3") ProxyPassReverse "/backend" "ajp://10.0.75.1:8500/backend"Īnd I access my web app by a domain name on my /etc/hosts : velop I have my dev environment set up this way :Īn Angular app (node server running on 4200)Ī spring boot backend (ajp connector set up on tomcat on port 8500)Ī frontal apache2 server (on a docker container) set up to redirect requests to both apps : AH00896: failed to make connection to backend: 10.0.75.1, referer: My apache2 can no longer connect (by ajp) to my Spring boot's embedded tomcat after upgrading Spring boot's version from 2.1.4 to 2.3.2.
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