we are seeing a 403 - Forbidden not sure what happened......

Just a few suggestions to add to what Sathya has already said:

1. See if restarting the app server solves the problem
2. Review if the following file has been recently updated, if it has then restore it to the out of the box version
<APPIAN_HOME>\\ear\\suite.ear\\web.war\\WEB-INF\\conf\\security\\csrf\\whitelist-urlrewrite.xml
<APPIAN_HOME>\\runtime_ear\\suite.ear\\web.war\\WEB-INF\\conf\\security\\csrf\\whitelist-urlrewrite.xml
3. Review if there has been any updates to the files inside these directories

<APPIAN_HOME>\\ear\\suite.ear\\web.war\\WEB-INF\\conf\\security\\spring*.xml
<APPIAN_HOME>\\runtime_ear\\suite.ear\\web.war\\WEB-INF\\conf\\security\\spring*.xml

Just a few suggestions to add to what Sathya has already said:

1. See if restarting the app server solves the problem
2. Review if the following file has been recently updated, if it has then restore it to the out of the box version
<APPIAN_HOME>\\ear\\suite.ear\\web.war\\WEB-INF\\conf\\security\\csrf\\whitelist-urlrewrite.xml
<APPIAN_HOME>\\runtime_ear\\suite.ear\\web.war\\WEB-INF\\conf\\security\\csrf\\whitelist-urlrewrite.xml
3. Review if there has been any updates to the files inside these directories

<APPIAN_HOME>\\ear\\suite.ear\\web.war\\WEB-INF\\conf\\security\\spring*.xml
<APPIAN_HOME>\\runtime_ear\\suite.ear\\web.war\\WEB-INF\\conf\\security\\spring*.xml