ANSWERED TransIP API

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DNS challenges not working for letsencrypt with transip api.
Even when whitelisting large ranges:

Its fine on other connections

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Since I was having some trouble with accessing some other websites. And I could access them fine from the eddie client, I went on to investigate.

What solved my problems was setting an MSS of 1412 on the LAN interface in OPNsense, and ditching all the MTU's everywhere.
API request and websites that did not work are working fine now.

Maybe someone has a use also for this information