2020-02-04 06:22:25,342: WARN [ajp-nio-8009-exec-9] com.agnitas.emm.core.sessionhijacking.web.GroupingSessionHijackingPreventionFilter - IP address of client is not allowed for current session - invalidating session 35636EB5ECB290A27F48349252EAB970 (session: /84.0.1.26, client: /13.0.1.106, URL: https://newsletter.faux.at/mailingsend.do;jsessionid=35636EB5ECB290A27F48349252EAB970, referer: null)
04-Feb-2020 06:22:25.895 INFO [ajp-nio-8009-exec-5] org.apache.tomcat.util.http.parser.Cookie.logInvalidHeader A cookie header was received ["menu_state\":\"\\"open\\"\"}"] that contained an invalid cookie. That cookie will be ignored.
Note: further occurrences of this error will be logged at DEBUG level.
Looks like you are using different IP addresses in the same session. To prevent session hijacking, OpenEMM ends your session. You can enter your "safe" IP addresses in table sessionhijackingprevention_tbl in column IP, so that they are ignored in the future.
Thanks for your reply!
I'm using the same IP address for all queries to the OpenEMM. For all forms and pages the request are processed successfully, except for submitting the mailing forms. Each time I submit such a form the described behavior occurs.
I've installed a Apache httpd as a reverse proxy in front of Tomcat via AJP, if this might be relevant.