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by api
2306 days ago
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It was probably behind finicky and heavily restrictive symmetric NAT (very p2p-hostile) but with IPSec ALG in the NAT, making it work fine with IPSec but horribly with anything else. This is common in "enterprise" settings and hard to diagnose without direct remote access to run NAT characterization tests. Symmetric NAT basically breaks everything that doesn't use a simple client/server hub-and-spoke networking model. |
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