btinternet email error on iphone - port 993 timed out

RBG IT
RBG IT used Ask the Experts™
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my boss has an ...@btinternet.com email account on his iPhone. When  he's connected to talktalk broadband at his home, the account shows error 'port 993 timed out' when synchronising. If the phone is connected to another network or using 3G/4G, it works fine.

The error began a few days ago.

Steps taken;
-turned device off/on
-removed/re-added mail account
-tried toggling SSL on/off
-Spoken to ISP who were unable to help

I'm assuming this is simply an ISP fault but any help would be appreciated.

Thanks
John
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Jackie Man IT Manager
Top Expert 2010

Commented:
When  he's connected to talktalk broadband at his home, the account shows error 'port 993 timed out' when synchronising.

The above is an obvious problem from the ISP.

Have you tried to power off and restart the router provided by the ISP?

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