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change Provider - Problem IPsec

Hello everyone,

I'm slowly at the end of my thoughts... maybe someone has an idea.
One of our branch offices (SG115) is to switch from provider Telekom (FritzBox with DynDNS and IPv4 [has been active for many years]) to provider Vodafone (fixed IPv4) and both connections are currently active for the transition.
The center has a SG310 with fixed IP at Telefonica O2.
If I no longer route the IPsec tunnel in the branch office by Telekom but by Vodafone (also adapted remote GWs), this is successfully established (phase 1 + 2 = IPsec SA established) and I can also ping through the ipsec tunnel without problems.
But all other connections (e.g. WebGui to a printer) only work to a limited extent. Or if you call up a WebGui, then it breaks off again. However, the IPsec tunnel is always constant and "continuous pings" are also constant. And the logs don't report any errors either... :-(
Does somebody has any idea???


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