We have detected when we have more than 8 SSH sessions the PortServer TS-1 start collapsing. We cannot access to the device and serialoverip behavior degrades affecting to the final equipment.
From the firmware release notes:
Some modern TLS/SSL-based clients and/or servers require a more
secure mechanism to exchange security information than was supported in
this product. The strength of the “Diffie-Hellman Group” has been
doubled to improve compatibility with modern systems, at the potential
cost of performance. See known limitations.
- This firmware version updates and restricts encryption to the device according to recent industry guidance and best practices. Given the resource constraints in this product architecture, and the increased computational power required to implement newer encryption methods, these latest changes may impact product performance in some applications, significantly increasing the time required for encrypted communications to complete. If application performance with this revision is not suitable, the best options are to revert to the previous (revision W) firmware or use the product without using SSL/TLS encryption.