on 16-04-2020 08:07 AM
I have a Yale smart home alarm system that is controlled from a phone app via the internet. It's worked fine for a couple of years, but in the last couple of days the system has been unable to connect to the internet. After carrying out some troubleshooting checks with the help of Yale technical support, they have asked whether my ISP has blocked TCP port 25 (which evidently the system uses). Can any one advise whether TalkTalk have recently blocked port 25?
on 24-04-2020 10:59 AM
Sorry for the delayed reply, we're doing our best in these unprecedented circumstances due to the Corona virus to answer everyone as quickly as possible.
We don't apply port blocking.
If a port has been blocked, it would have been locally, either by changing the settings in the router or firewall and in some cases this can be done by anti-virus software.
If you haven't been into the router and don't implement a firewall then this is unlikely to be the cause.
Port 25 is used for SMTP and can't see any reason why this would be changed by an anti-virus software either.
If you use a mail client like outlook and and can still send and receive Emails, this would indicate that port 25 is open.