Hello everyone, we are fully aware of this issue and after a long troubleshooting process, we have finally identified the problem and hopefully have fixed it (at least in our testing lab ), Iād like to invite you to try it out and let us know the result 
Below is the special firmware, version 6.3.2s062, which is based on 6.3.2 GA with the L2TP/IPsec fix applied.
Balance 20, 30:
http://download.peplink.com/firmware/plb30/fw-b20_30-6.3.2s062-build3233.bin [Download]](http://download.peplink.com/firmware/plb30/fw-b20_30-6.3.2s062-build3233.bin)
SHA-1: 40ae7fcfd170f4c60f37c1ae4ca696d979d7e860
Balance 210 hw2-3, 310 hw2-3:
http://download.peplink.com/firmware/plb310/fw-b210_310_hw2_hw3-6.3.2s062-build3233.bin [Download]](http://download.peplink.com/firmware/plb310/fw-b210_310_hw2_hw3-6.3.2s062-build3233.bin)
SHA-1: 489c60dda563d7bea75e7c607bc161faf3226636
Balance 305 hw1, 380 hw3-5, 580 hw1, 710 hw1-2, 1350 hw1:
http://download.peplink.com/firmware/plb700/fw-b305_380_580_710_1350-6.3.2s062-build3561.bin [Download]](http://download.peplink.com/firmware/plb700/fw-b305_380_580_710_1350-6.3.2s062-build3561.bin)
SHA-1: 6be7b0c8d51aa3db0cbbecfe9cd86b507a3a1f58