Thank you for the response! I will take a look at the linked resource and respond back here again later once I have a FB number.

@DTS Engineer I have submitted a bug report with number FB16538127. Thank you for your time.

Thanks for the suggestion. We're testing out using the "Negotiate Client Certificate" setting in IIS to workaround this - give it a look. We are using Big IP, and we had thought that the comparable settings there would be "No session resumption on renegotiation" in the Options List as defined in the tech documents for Big IP (v17.x.x). We tried testing with different settings listed there related to SSL renegotiation, including the one above, but the behavior on the iOS side is unchanged.

@DTS Engineer I wanted to follow up on this because it is still an ongoing urgent issue and we have received no response or even an acknowledgement of our Bug Report being received. The issue has not been resolved as of the latest release of iOS 18.3.2.

@DTS Engineer My bug report incident, FB16538127, resulted in a request to check a potential fix. It seemed to work, so as per the instructions provided, I closed the issue. However, now we are in a situation where it says "Potential fix identified - For a future OS update (closed)". Will this be updated at some point to reflect the version it will actually appear in? It was present in 18.5 Beta 4, but with the public release, the fix was not present. I am a bit confused why.