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On a single network, some mobile devices can connect to our Mattermost service, others cannot
Steps to reproduce
Mattermost 4.1.0. This might be hard to reproduce, since the problem could be something in our local network.
Clients should be able to connect from both internal and external networks, consistently.
We’re using a split DNS configuration; the hostname for our Mattermost service resolves, on our internal network, directly to the VM running Mattermost. On external networks, it resolves to a Brocade Traffic Manager appliance which then passes the request on to the Mattermost VM.
Clients on public networks connect fine. Clients on our wired internal network seem to work fine also. The problem is with mobile clients attached to our “internal” wireless network. Some work and some don’t, with no discernible pattern.
MacBook Pro on “internal wireless” network: Works perfectly, for both Desktop client and Safari
iPhone SE on “internal wireless” network: Works perfectly using App Store client
iPad Pro on “internal wireless” network: Fails to connect, using either App Store client or Safari
Same iPad Pro connected to “eduroam” network (treated as external): Works perfectly
Colleague’s iPhone on “internal wireless” network: Fails to connect
If this were a straightforward firewall issue, I’d expect no clients to ever work on the internal wireless network.
This may well not be an issue with Mattermost, but if anyone has any ideas I’d like to hear them!