EssentialPIM

After an update months ago my calendar sync between Win 11 and IOS quit working. I didn't find a solution on this forum or in the help files but this is what fixed my problem. What I found were blocked EPIM rules in the Win 11 Defender Firewall. I have no idea where they came from but several firewall port inbound rules were listed as blocked along with other rules that were not blocked. I deleted the rules marked as blocked and my sync to IOS started working again. You get to the firewall by typing "wf.msc" in the Windows search box and click on the result. Then click on "Inbound Rules" and look for EPIM rules and delete any that are blocked. I checked outbound rules but had none.