We can't access our corporate email through WiFi

[Veronika3020003]

We can't access our corporate email through WiFi, the provider said that nothing is blocked in their side, maybe its the problem from roundcube side. What the problem it can be? And how we can solve this problem? Help us please. Our provider is VEGA IP Address is 83.218.237.62

[SKaero]

This is unlikely to be a Roundcube problem, what error exactly are you getting?

[Veronika3020003]

"There is no connection to the site. Host euvip05.twinservers.net:2096/cpsess6455258484/3rdparty/roundcube/?_task=mail&_mbox=INBOX.Sent does not respond for a long time". And this problem just with our wifi, when we connect to another network site works and loads immediately

[SKaero]

Thats definitely not a problem with Roundcube. Its most likely a problem with a firewall or routing rule on your network. I see that your using Roundcube in cPanel and that requires that you can access port 2096 if that is blocked it maybe the source of your problem but I don't think we'll be able to help here.

[herman21]

If it works normally over mobile data or another internet connection but fails only when connected to Wi-Fi, look at the router/network path before blaming Roundcube. Roundcube itself is just the webmail interface; the actual connection still depends on DNS, HTTPS and the mail server being reachable. First try opening the webmail from another device on the same Wi-Fi. If everyone has the same problem, check the router's DNS settings and try a different DNS server such as 1.1.1.1 or 8.8.8.8, you can visit the settings page by typing your ip address such as 192.l.168.8.1 or 192.168.2.1 into the address bar. Also check whether the router or ISP is filtering the webmail domain or blocking the required traffic. If the webmail page opens but you get an error after loagging in, the problem could be on the IMAP/SMTP side instead. Roundcube can show connection errors when the underlying mail services or authentication are unavailable. The most useful test would be to compare Wi-Fi with mobile data. If the same account works immediately over mobile data, that points much more towards the Wi-Fi/router/DNS path than Roundcube itself.