OS Tahoe 26.5

I face some problems with the following apps after downloading the OS Tahoe 26.5 (my iMac - 24inch,2023/Chip Apple M3/Memory 16GB)

  1. Appstore cannot connect to the internet
  2. Mail app have connection problem, cannot renew my mailbox as usual

remark: will it be possible because I am using a VPN service so that it conflict with the new OS ?

OS Tahoe 26.5
 
 
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