I have three new 750s which will not connect with manually assigned static IPs. Nothing wrong with addressing as I can plug in a Cisco 851 with same ip and route statement and move right along. Masquerade is on. Has anyone experienced this trouble with the new boxes?

Have you verified that there isn't some unexpected configuration somewhere, such as which ports are in a switchgroup, and did you put Your ips or anthing else relevant on the master port of the switchgroup rather than one of the slaves?

Also already existing firewall or NAT rules, or dhcp client and/or server?

new 750s which will not connect with

connect where? which IP did you manually set? on which interface? post config please

Will have to post config later but here is the setup:
Router hanging in DMZ with static IP applied to interface 1. Cleared router's default config as normal so there are no hidden settings. Also added route statement 0.0.0.0/0 to default GW.

0# jan/02/1970 00:06:58 by RouterOS 4.16
# software id = NNK3-FQJ5
#
/interface ethernet
set 0 arp=enabled auto-negotiation=yes comment="" disabled=no full-duplex=yes \
l2mtu=1526 mac-address=00:0C:42:81:7C:98 mtu=1500 name=ether1 speed=\
100Mbps
set 1 arp=enabled auto-negotiation=yes bandwidth=unlimited/unlimited comment=\
"" disabled=no full-duplex=yes l2mtu=1524 mac-address=00:0C:42:81:7C:99 \
master-port=none mtu=1500 name=ether2 speed=100Mbps
set 2 arp=enabled auto-negotiation=yes bandwidth=unlimited/unlimited comment=\
"" disabled=no full-duplex=yes l2mtu=1524 mac-address=00:0C:42:81:7C:9A \
master-port=none mtu=1500 name=ether3 speed=100Mbps
set 3 arp=enabled auto-negotiation=yes bandwidth=unlimited/unlimited comment=\
"" disabled=no full-duplex=yes l2mtu=1524 mac-address=00:0C:42:81:7C:9B \
master-port=none mtu=1500 name=ether4 speed=100Mbps
set 4 arp=enabled auto-negotiation=yes bandwidth=unlimited/unlimited comment=\
"" disabled=no full-duplex=yes l2mtu=1524 mac-address=00:0C:42:81:7C:9C \
master-port=none mtu=1500 name=ether5 speed=100Mbps
/interface ethernet switch
set switch1 mirror-source=none mirror-target=none name=switch1
/interface wireless security-profiles
set default authentication-types="" eap-methods=passthrough group-ciphers="" \
group-key-update=5m interim-update=0s management-protection=disabled \
management-protection-key="" mode=none name=default \
radius-eap-accounting=no radius-mac-accounting=no \
radius-mac-authentication=no radius-mac-caching=disabled \
radius-mac-format=XX:XX:XX:XX:XX:XX radius-mac-mode=as-username \
static-algo-0=none static-algo-1=none static-algo-2=none static-algo-3=\
none static-key-0="" static-key-1="" static-key-2="" static-key-3="" \
static-sta-private-algo=none static-sta-private-key="" \
static-transmit-key=key-0 supplicant-identity=MikroTik tls-certificate=\
none tls-mode=no-certificates unicast-ciphers="" wpa-pre-shared-key="" \
wpa2-pre-shared-key=""
/ip hotspot profile
set default dns-name="" hotspot-address=0.0.0.0 html-directory=hotspot \
http-cookie-lifetime=3d http-proxy=0.0.0.0:0 login-by=cookie,http-chap \
name=default rate-limit="" smtp-server=0.0.0.0 split-user-domain=no \
use-radius=no
/ip hotspot user profile
set default idle-timeout=none keepalive-timeout=2m name=default shared-users=\
1 status-autorefresh=1m transparent-proxy=no
/ip ipsec proposal
set default auth-algorithms=sha1 comment="" disabled=no enc-algorithms=3des \
lifetime=30m name=default pfs-group=modp1024
/ip pool
add name=dhcp_pool1 ranges=192.168.1.2-192.168.1.254
/ip dhcp-server
add address-pool=dhcp_pool1 authoritative=after-2sec-delay bootp-support=\
static disabled=no interface=ether2 lease-time=3d name=dhcp1
/ppp profile
set default change-tcp-mss=yes comment="" name=default only-one=default \
use-compression=default use-encryption=default use-vj-compression=default
set default-encryption change-tcp-mss=yes comment="" name=default-encryption \
only-one=default use-compression=default use-encryption=yes \
use-vj-compression=default
/queue type
set default kind=pfifo name=default pfifo-limit=50
set ethernet-default kind=pfifo name=ethernet-default pfifo-limit=50
set wireless-default kind=sfq name=wireless-default sfq-allot=1514 \
sfq-perturb=5
set synchronous-default kind=red name=synchronous-default red-avg-packet=1000 \
red-burst=20 red-limit=60 red-max-threshold=50 red-min-threshold=10
set hotspot-default kind=sfq name=hotspot-default sfq-allot=1514 sfq-perturb=\
5
set default-small kind=pfifo name=default-small pfifo-limit=10
/routing bgp instance
set default as=65530 client-to-client-reflection=yes comment="" disabled=no \
ignore-as-path-len=no name=default out-filter="" redistribute-connected=\
no redistribute-ospf=no redistribute-other-bgp=no redistribute-rip=no \
redistribute-static=no router-id=0.0.0.0 routing-table=""
/routing ospf instance
set default comment="" disabled=no distribute-default=never in-filter=ospf-in \
metric-bgp=auto metric-connected=20 metric-default=1 metric-other-ospf=\
auto metric-rip=20 metric-static=20 name=default out-filter=ospf-out \
redistribute-bgp=no redistribute-connected=no redistribute-other-ospf=no \
redistribute-rip=no redistribute-static=no router-id=0.0.0.0
/routing ospf area
set backbone area-id=0.0.0.0 comment="" disabled=no instance=default name=\
backbone type=default
/routing ospf-v3 instance
set default comment="" disabled=no distribute-default=never metric-bgp=auto \
metric-connected=20 metric-default=1 metric-other-ospf=auto metric-rip=20 \
metric-static=20 name=default redistribute-bgp=no redistribute-connected=\
no redistribute-other-ospf=no redistribute-rip=no redistribute-static=no \
router-id=0.0.0.0
/routing ospf-v3 area
set backbone area-id=0.0.0.0 comment="" disabled=no instance=default name=\
backbone type=default
/snmp
set contact="" enabled=no engine-boots=0 engine-id="" location="" \
time-window=15 trap-sink=0.0.0.0 trap-version=1
/snmp community
set public address=0.0.0.0/0 authentication-password="" \
authentication-protocol=MD5 encryption-password="" encryption-protocol=\
DES name=public read-access=yes security=none write-access=no
/system logging action
set memory memory-lines=100 memory-stop-on-full=no name=memory target=memory
set disk disk-file-count=2 disk-file-name=log disk-lines-per-file=100 \
disk-stop-on-full=no name=disk target=disk
set echo name=echo remember=yes target=echo
set remote bsd-syslog=no name=remote remote=0.0.0.0:514 src-address=0.0.0.0 \
syslog-facility=daemon syslog-severity=auto target=remote
/system routerboard settings
set boot-device=nand-if-fail-then-ethernet boot-protocol=bootp cpu-frequency=\
400MHz force-backup-booter=no silent-boot=no
set boot-device=nand-if-fail-then-ethernet boot-protocol=bootp cpu-frequency=\
400MHz force-backup-booter=no silent-boot=no
/user group
add comment="" name=read policy="local,telnet,ssh,reboot,read,test,winbox,pass\
word,web,sniff,sensitive,!ftp,!write,!policy"
add comment="" name=write policy="local,telnet,ssh,reboot,read,write,test,winb\
ox,password,web,sniff,sensitive,!ftp,!policy"
add comment="" name=full policy="local,telnet,ssh,ftp,reboot,read,write,policy\
,test,winbox,password,web,sniff,sensitive"
/interface bridge settings
set use-ip-firewall=no use-ip-firewall-for-pppoe=no use-ip-firewall-for-vlan=\
no
/interface ethernet switch port
set (unknown) vlan-header=leave-as-is vlan-mode=fallback
set (unknown) vlan-header=leave-as-is vlan-mode=fallback
set (unknown) vlan-header=leave-as-is vlan-mode=fallback
set (unknown) vlan-header=leave-as-is vlan-mode=fallback
/interface l2tp-server server
set authentication=pap,chap,mschap1,mschap2 default-profile=\
default-encryption enabled=no max-mru=1460 max-mtu=1460 mrru=disabled
/interface ovpn-server server
set auth=sha1,md5 certificate=none cipher=blowfish128,aes128 default-profile=\
default enabled=no keepalive-timeout=60 mac-address=FE:19:06:C9:17:15 \
max-mtu=1500 mode=ip netmask=24 port=1194 require-client-certificate=no
/interface pptp-server server
set authentication=mschap1,mschap2 default-profile=default-encryption \
enabled=no keepalive-timeout=30 max-mru=1460 max-mtu=1460 mrru=disabled
/interface wireless align
set active-mode=yes audio-max=-20 audio-min=-100 audio-monitor=\
00:00:00:00:00:00 filter-mac=00:00:00:00:00:00 frame-size=300 \
frames-per-second=25 receive-all=no ssid-all=no
/interface wireless sniffer
set channel-time=200ms file-limit=10 file-name="" memory-limit=10 \
multiple-channels=no only-headers=no receive-errors=no streaming-enabled=\
no streaming-max-rate=0 streaming-server=0.0.0.0
/interface wireless snooper
set channel-time=200ms multiple-channels=yes receive-errors=no
/ip accounting
set account-local-traffic=no enabled=no threshold=256
/ip accounting web-access
set accessible-via-web=no address=0.0.0.0/0
/ip address
add address=xx.xx.xx.xx/24 broadcast=xx.xx.xx.xx comment="" disabled=no \
interface=ether1 network=xx.xx.xx.xx
add address=192.168.1.1/24 broadcast=192.168.1.255 comment="" disabled=no \
interface=ether2 network=192.168.1.0
/ip dhcp-server config
set store-leases-disk=5m
/ip dhcp-server network
add address=192.168.1.0/24 comment="" gateway=192.168.1.1
/ip dns
set allow-remote-requests=no cache-max-ttl=1w cache-size=2048KiB \
max-udp-packet-size=512 servers=208.180.42.100,208.180.42.68
/ip firewall connection tracking
set enabled=yes generic-timeout=10m icmp-timeout=10s tcp-close-timeout=10s \
tcp-close-wait-timeout=10s tcp-established-timeout=1d \
tcp-fin-wait-timeout=10s tcp-last-ack-timeout=10s \
tcp-syn-received-timeout=5s tcp-syn-sent-timeout=5s tcp-syncookie=no \
tcp-time-wait-timeout=10s udp-stream-timeout=3m udp-timeout=10s
/ip firewall filter
add action=accept chain=forward comment="" disabled=no
/ip firewall nat
add action=masquerade chain=srcnat comment="" disabled=no out-interface=\
ether1
/ip firewall service-port
set ftp disabled=no ports=21
set tftp disabled=no ports=69
set irc disabled=no ports=6667
set h323 disabled=no
set sip disabled=no ports=5060,5061
set pptp disabled=no
/ip hotspot service-port
set ftp disabled=no ports=21
/ip neighbor discovery
set ether1 discover=yes
set ether2 discover=yes
set ether3 discover=yes
set ether4 discover=yes
set ether5 discover=yes
/ip proxy
set always-from-cache=no cache-administrator=webmaster cache-hit-dscp=4 \
cache-on-disk=no enabled=no max-cache-size=none max-client-connections=\
600 max-fresh-time=3d max-server-connections=600 parent-proxy=0.0.0.0 \
parent-proxy-port=0 port=8080 serialize-connections=no src-address=\
0.0.0.0
/ip route
add comment="" disabled=no distance=1 dst-address=0.0.0.0/0 gateway=\
xx.xx.xx.xx scope=30 target-scope=10
/ip service
set telnet address=0.0.0.0/0 disabled=no port=23
set ftp address=0.0.0.0/0 disabled=no port=21
set www address=0.0.0.0/0 disabled=no port=80
set ssh address=0.0.0.0/0 disabled=no port=22
set www-ssl address=0.0.0.0/0 certificate=none disabled=yes port=443
set api address=0.0.0.0/0 disabled=yes port=8728
set winbox address=0.0.0.0/0 disabled=no port=8291
/ip socks
set connection-idle-timeout=2m enabled=no max-connections=200 port=1080
/ip traffic-flow
set active-flow-timeout=30m cache-entries=4k enabled=no \
inactive-flow-timeout=15s interfaces=all
/ip upnp
set allow-disable-external-interface=yes enabled=no show-dummy-rule=yes
/ipv6 nd
add advertise-dns=no advertise-mac-address=yes disabled=no hop-limit=\
unspecified interface=all managed-address-configuration=no mtu=\
unspecified other-configuration=no ra-delay=3s ra-interval=3m20s-10m \
ra-lifetime=30m reachable-time=unspecified retransmit-interval=\
unspecified
/ipv6 nd prefix default
set autonomous=yes preferred-lifetime=1w valid-lifetime=4w2d
/mpls
set dynamic-label-range=16-1048575 propagate-ttl=yes
/mpls interface
add comment="" disabled=no interface=all mpls-mtu=1508
/mpls ldp
set distribute-for-default-route=no enabled=no hop-limit=255 loop-detect=no \
lsr-id=0.0.0.0 path-vector-limit=255 transport-address=0.0.0.0 \
use-explicit-null=no
/ppp aaa
set accounting=yes interim-update=0s use-radius=no
/queue interface
set ether1 queue=ethernet-default
set ether2 queue=ethernet-default
set ether3 queue=ethernet-default
set ether4 queue=ethernet-default
set ether5 queue=ethernet-default
/radius incoming
set accept=no port=3799
/routing bfd interface
set all comment="" disabled=no interface=all interval=0.2sec min-rx=0.2sec \
multiplier=5
/routing igmp-proxy
set query-interval=2m5s query-response-interval=10s quick-leave=no
/routing mme
set bidirectional-timeout=2 gateway-class=none gateway-keepalive=1m \
gateway-selection=no-gateway origination-interval=5s preferred-gateway=\
0.0.0.0 timeout=1m ttl=50
/routing pim
set switch-to-spt=yes switch-to-spt-bytes=0 switch-to-spt-interval=1m40s
/routing rip
set distribute-default=never garbage-timer=2m metric-bgp=1 metric-connected=1 \
metric-default=1 metric-ospf=1 metric-static=1 redistribute-bgp=no \
redistribute-connected=no redistribute-ospf=no redistribute-static=no \
routing-table=main timeout-timer=3m update-timer=30s
/routing ripng
set distribute-default=never garbage-timer=2m metric-bgp=1 metric-connected=1 \
metric-default=1 metric-ospf=1 metric-static=1 redistribute-bgp=no \
redistribute-connected=no redistribute-ospf=no redistribute-static=no \
timeout-timer=3m update-timer=30s
/store
add comment="" disabled=no disk=system name=user-manager1 type=user-manager
add comment="" disabled=no disk=system name=web-proxy1 type=web-proxy
/system clock
set time-zone-name=manual
/system clock manual
set dst-delta=+00:00 dst-end="jan/01/1970 00:00:00" dst-start=\
"jan/01/1970 00:00:00" time-zone=+00:00
/system console
add disabled=no term=vt102
/system gps
set channel=0 enabled=no set-system-time=no
/system health
set
/system identity
set name=MikroTik
/system logging
add action=memory disabled=no prefix="" topics=info
add action=memory disabled=no prefix="" topics=error
add action=memory disabled=no prefix="" topics=warning
add action=echo disabled=no prefix="" topics=critical
/system note
set note="" show-at-login=yes
/system ntp client
set enabled=no mode=unicast primary-ntp=0.0.0.0 secondary-ntp=0.0.0.0
/system ntp server
set broadcast=no enabled=no manycast=yes multicast=no
/system upgrade mirror
set check-interval=1d enabled=no primary-server=0.0.0.0 secondary-server=\
0.0.0.0 user=""
/system watchdog
set auto-send-supout=no automatic-supout=yes no-ping-delay=5m watch-address=\
none watchdog-timer=yes
/tool bandwidth-server
set allocate-udp-ports-from=2000 authenticate=yes enabled=yes max-sessions=\
100
/tool e-mail
set from=<> password="" server=0.0.0.0:25 username=""
/tool graphing
set page-refresh=300 store-every=5min
/tool mac-server
add disabled=no interface=all
/tool mac-server ping
set enabled=yes
/tool sms
set allowed-number="" channel=0 keep-max-sms=0 receive-enabled=no secret=""
/tool sniffer
set file-limit=10 file-name="" filter-address1=0.0.0.0/0:0-65535 \
filter-address2=0.0.0.0/0:0-65535 filter-protocol=ip-only filter-stream=\
yes interface=all memory-limit=10 memory-scroll=no only-headers=no \
streaming-enabled=no streaming-server=0.0.0.0
/tool user-manager customer
add comment="" disabled=no login=admin parent=admin password="" \
paypal-accept-pending=no paypal-allowed=no paypal-secure-response=no \
permissions=owner signup-allowed=no subscriber=admin time-zone=+00:00
/user aaa
set accounting=yes default-group=read interim-update=0s use-radius=no

Will accept dhcp from cable modem and will pass inet traffic. Upgraded with latest firmware as well. Still no joy with static.