Cannot make connection FROM XP 11.5 TO Win7 12.5

Upgrading a number of machines in my stores from XP Pro with PCA 11.5.0 build 121 to Win 7 Pro (32 bit) with PCA 12.5.0 build 442.

I CAN connect FROM the 12.5 into the hosts running 11.5.

I CANNOT connect FROM an 11.5 remote INTO the 12.5 host.

I have checked the CALLERS and they appear to be correct.

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