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Authenticate/Decrypt packet error: packet HMAC authentication failed

We have same problem with only one client like written in:

All other colleagues work the whole day without any problem. First we used SSL VPN Client and now Sophos Conncet - nothing changed. I tried it with same ovpn-file like the affected user at my notebook and it works good.

In the other thread I do not understand the last post from  because the Cryptographic Settings in Advanced Tab are the same for all users:

What could be the problem?

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