New BIG-IP ASM v13 Outlook Web Access (OWA) 2016 Ready Template
Published Jan 24, 2018
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Thanks Udo for reaching out, usually the alert is raised only after upgrading/changing the policy but it should stop after existing sessions are expired.
See https://support.f5.com/csp/article/K20323120 for more information.
If you think that is still occurs and it is a false-positive, you can remove the block protection: Security ›› Application Security : Policy Building : Learning and Blocking Settings >> Cookies >> Modified ASM cookie