Plutonium

it was working for me yesterday, but today it's not

looks like it's fixed for me, thanks guys!

This is happening to me in Australia. When I connect using a VPN, the connection works (but the ping is super high because it's a free VPN) When I disconnect the VPN, I can continue playing for about 60 seconds, then the game loses connection.

you can restrict killstreaks in in the tdm.cfg file (and I assume other gamemode specific cfg files)

using the following

restrict_item "killstreak_spyplane" // UAV
restrict_item "killstreak_rcbomb" // RC-XD
restrict_item "killstreak_missile_drone" // Hunter Killer
restrict_item "killstreak_supply_drop" // Care Package
restrict_item "killstreak_counteruav" // Counter-UAV
restrict_item "killstreak_microwave_turret" // Guardian
restrict_item "killstreak_remote_missile" // Hellstorm Missile
restrict_item "killstreak_planemortar" // Lightning Strike
restrict_item "killstreak_auto_turret" // Sentry Gun
restrict_item "killstreak_minigun" // Death Machine
restrict_item "killstreak_m32" // War Machine
restrict_item "killstreak_qrdrone" // Dragonfire
restrict_item "killstreak_ai_tank_drop" // A.G.R.
restrict_item "killstreak_helicopter_comlink" // Stealth Chopper
restrict_item "killstreak_spyplane_direction" // Orbital VSAT
restrict_item "killstreak_helicopter_guard" // Escort Drone
restrict_item "killstreak_emp" // EMP Systems
restrict_item "killstreak_straferun" // Warthog
restrict_item "killstreak_remote_mortar" // Lodestar
restrict_item "killstreak_helicopter_player_gunner" // VTOL Warship
restrict_item "killstreak_dogs" // K9 Unit
restrict_item "killstreak_missile_swarm" // Swarm

this will just disable the specified killstreak. I am currently not aware of a way to replace a killstreak with a different killstreak. I'm also not sure if a restricted killstreak can still come out of a care package

Is there any way to replace a kill streak with a different kill streak?

Removing a kill streak with no replacement can be done in tdm.cfg using

restrict_item "killstreak_spyplane".

This works.
Replacing a weapon with another weapon can be done in restricted.cfg using

replacement beretta93r_mp+extclip
smaw_mp

This works.
Trying to replace a kill streak with a different kill streak in restricted.cfg does not work (with what I've tried

replacement supply_drop_mp 
comlink_mp

Does not work

replacement killstreak_missile_drone
killstreak_spyplane

does not work

different names are listed for each kill streak in restricted.cfg, from what is listed higher up in this thread.

press ~ to open console
type "bot_difficulty 0" (without quotes) to set the difficulty to 0.
0 is the easiest, 3 is the hardest