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Hi @Abcd5
Please, also verify if you have this issue when you boot your device into safe mode as explained here. If the issue is not present in this mode, that indicates a third party app is causing the problem. In this case exit Safe Mode and then un-install any third party apps you don't need and clear the cache/data for the apps you want to keep.
Hi @Abcd5
Do you have software version 23.1.A.0.690 in your device ? To find your device’s current software version got to Settings -> About phone -> Build number / version. Please, also check that you haven't put any special character in SSID or password, this can cause problems. I´m at disposal for any question
Hi @Abcd5
Ok, have you checked that you haven't put any special character in SSID or password ? Your carrier allows tethering ?
Hi @Abcd5
Please, remember to verify that your carrier allows tethering as I have suggested before. Check these threads for more information about this issue:
http://talk.sonymobile.com/t5/Xperia-Z-ZL-ZR/Xperia-Z-Error-Ocurred-During-Tethering/m-p/334931#M118...
http://talk.sonymobile.com/t5/Xperia-V/quot-Tethering-error-quot-Error-occurred-during-tethering/m-p...
http://talk.sonymobile.com/t5/Xperia-P/Tethering-error/m-p/287501#M13125