If your Splashtop software displays "Unable to reach Splashtop servers" or "Unable to reach Splashtop relay servers," please check the following steps to troubleshoot:
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Make sure your device is connected to the Internet, and proxy settings are configured properly on your machine's network settings and/or in the Splashtop software settings.
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Check with your network admin to make sure the following addresses are reachable on your network:
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(New) Can run a tool to see if a network firewall: www.splashtop.com/check
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*.api.splashtop.com (* is wildcard)
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currently: st2.api.splashtop.com and st2-relay.api.splashtop.com
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*.relay.splashtop.com (* is wildcard)
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port 443 needs to be open and allow both HTTP over TLS and non-HTTP over TLS
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If there is a firewall or anti-virus enabled on your device, make sure the following Splashtop processes are not blocked:
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SRManager.exe
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SRFeature.exe
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SRServer.exe - old
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SRUpdate.exe - old
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Dataproxy.exe (only necessary if still using Splashtop gen-1 Internet Discovery feature through Google account) - old
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spupnp.exe (only necessary if still using Internet Discovery feature) - old
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If your machine is running Windows XP or Server 2003, make sure they are updated to XP SP3 or Server 2003 SP2 with the latest Windows updates applied in order to support the latest security/encryption algorithms. Refer to this article on how to import the right certificate into your system to allow the Splashtop Streamer to reach our servers.
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Try restarting your router.
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Check that the date/time of the computer is correct. An incorrect time will affect communication to most cloud servers.
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Directly download the certificate (gdroot-g2.crt) from GoDaddy:
https://ssl-ccp.godaddy.com/repository?origin=CALLISTO
Double click the downloaded cert to import. Or follow below instruction to import if on XP machines: