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I am experiencing an issue where I get hundred/thousands of entries like the below like the below from an IP. The IP varies and the error randomly stops with no interaction on my part - stopping/starting the IdP has no effect. At this point, there does not
seem to be anything malicious going on (had our security team investigate).</div>
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I initially blocked the IP(s), but this also prevented legitimate authentication requests originating from the IP. </div>
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The IdP is running Shibboleth v5.1.6.</div>
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Has anyone else experienced this issue, and if so, did you determine a solution? </div>
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<b>xx.xxx.xx.xx|login.emory.edu|2026-02-12 21:36:32,412|9992BEDED070CBEE50D98AD64C274667| - ERROR [org.springframework.webflow.execution.repository.NoSuchFlowExecutionException:144] - </b></div>
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<b>org.springframework.webflow.execution.repository.NoSuchFlowExecutionException: No flow execution could be found with key 'e1s1' -- perhaps this executing flow has ended or expired? This could happen if your users are relying on browser history (typically
via the back button) that references ended flows.</b></div>
<div style="font-family: Aptos, Arial, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);">
<b>at org.springframework.webflow.execution.repository.support.AbstractFlowExecutionRepository.getConversation(AbstractFlowExecutionRepository.java:172)</b></div>
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<b>Caused by: org.springframework.webflow.conversation.NoSuchConversationException: No conversation could be found with id '1' -- perhaps this conversation has ended? </b></div>
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<b>at org.springframework.webflow.conversation.impl.ConversationContainer.getConversation(ConversationContainer.java:124)</b></div>
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<b>xx.xxx.xx.xx|login.emory.edu|2026-02-12 21:36:32,448|9AF5D704C4646B07C20525CE228E8D26| - ERROR [org.springframework.webflow.execution.repository.NoSuchFlowExecutionException:144] - </b></div>
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<b>org.springframework.webflow.execution.repository.NoSuchFlowExecutionException: No flow execution could be found with key 'e1s2' -- perhaps this executing flow has ended or expired? This could happen if your users are relying on browser history (typically
via the back button) that references ended flows.</b></div>
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<b>at org.springframework.webflow.execution.repository.support.AbstractFlowExecutionRepository.getConversation(AbstractFlowExecutionRepository.java:172)</b></div>
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<b>Caused by: org.springframework.webflow.conversation.NoSuchConversationException: No conversation could be found with id '1' -- perhaps this conversation has ended? </b></div>
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<b>at org.springframework.webflow.conversation.impl.ConversationContainer.getConversation(ConversationContainer.java:124)</b></div>
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