The configuration file /opt/open-xchange/etc/groupware/noipcheck.cnf is newly introduced. It contains the following content:

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# This file configures the IP address ranges that will be excluded on the client IP check. Only add here IP address ranges that have clients
# that you trust unconditionally. This configuration file currently only supports IPv4 addresses.

127.0.0.1-127.255.255.255

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This adds localhost or 127.0.0.1 to the client host IP whitelist. An IP check will not be done for IP ranges listed there.

Add here only IP ranges to this file that you trust unconditionally. Normally this are only IP addresses of your internal network for the OX installation.