On attempt to change
Preference for existing SRV DNS record to
Custom following error appears (click on the image below to get an example):
An unforeseen error occurred. Please contact firstname.lastname@example.org. Error ID: 1451051964403
The behavior was considered as internal software issue #PPA-3036.
The fix is considered to be included in one of the next PA updates.
Please use provided ID to track maintenance in Plesk Automation release notes.
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As a workaround you can remove affected SRV record and create it once again with required custom preference value.