Cannot access management interface IP

I cannot access another switch through the management IP.  It is a Cisco SG 500 layer 2 switch that is connected to a Cisco 3750 layer 3 switch,  The SG 500 has 4 vlans(1,50,99,150) with 99 being a management vlan.  The IP address of the SG is 192.168.99.2.  Port 50 on the switch is a trunk port with 1 untagged and 50, 99, and 150 added as a tagged vlan.  The 3750 has vlan 99 created and assigned IP 192.168.99.1.  The 2 switches are connected via ports 50(SG500) and 23(3750).    the pc can ping 192.168.99.1 but not the IP of the management IP of the switch, 192.168.99.2.  the client is connected to an access port on the 3750 in VLAN 1 with its DG being the 3750 switch.
putty.log
NytroZAsked:
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Daniel SheppardSenior Network Analyst - Core & PerimeterCommented:
SG series are web management only I believe, however, you can't even ping.

What is the DG of the SG switch?
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Daniel SheppardSenior Network Analyst - Core & PerimeterCommented:
What is the IP of the client PC?
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NytroZAuthor Commented:
client pc:

IP= 192.168.50.200/24

DG= 192.168.50.250(3750 VLAN 1 IP address)

the 3750 switch can ping the SG500 but the client pc cannot
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NytroZAuthor Commented:
Where is the DG set on the SG switch?
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Daniel SheppardSenior Network Analyst - Core & PerimeterCommented:
"Administration > Management Interface > IPv4 Interface"
-->"Administrative Default Gateway"
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