Well, the log clearly shows that it's incorrect.


From the router cli I can reach my host also on port 5050. And in the container I see the connection in the logs and that there's something wrong with the AVL package size. So I don't have clue where to search next. Like I said on the router weren't any changes at that time.
I told you exactly what the problem is, but if you don't believe me, I don't think anyone can help you.
@Hendrik
No, Sorry!
It can't be the ports! For the simple reason that we haven't changed anything on the ports! Strange! :-)
Anton, I showed you screenshots of my settings, which clearly state that I'm using the same port (on which the whole thing already worked nearly for a year) on my Teltonika Router an on my Traccar server. And here is also a tcpdump, where you can see, that my router is sending packets to that port, which also generate the log file entries I showed you above. I am not new to networking.
hendrik@razorcrest:~$ sudo tcpdump -vv tcp port 5050
tcpdump: listening on eth0, link-type EN10MB (Ethernet), snapshot length 262144 bytes
16:39:13.057869 IP (tos 0x0, ttl 54, id 7846, offset 0, flags [DF], proto TCP (6), length 69)
customer.wrswpol1.pop.starlinkisp.net.30951 > MYSERVER.happysrv.de.5050: Flags [P.], cksum 0x1728 (correct), seq 1142861826:1142861843, ack 2893232349, win 2008, options [nop,nop,TS val 690787872 ecr 3583377062], length 17
16:39:13.057999 IP (tos 0x0, ttl 63, id 27499, offset 0, flags [DF], proto TCP (6), length 52)
MYSERVER.happysrv.de.5050 > customer.wrswpol1.pop.starlinkisp.net.30951: Flags [.], cksum 0xc4b7 (incorrect -> 0x8d6b), seq 1, ack 17, win 22, options [nop,nop,TS val 3583388067 ecr 690787872], length 0
16:39:24.049851 IP (tos 0x0, ttl 54, id 7847, offset 0, flags [DF], proto TCP (6), length 69)
customer.wrswpol1.pop.starlinkisp.net.30951 > MYSERVER.happysrv.de.5050: Flags [P.], cksum 0xc12b (correct), seq 17:34, ack 1, win 2008, options [nop,nop,TS val 690798862 ecr 3583388067], length 17
16:39:24.049984 IP (tos 0x0, ttl 63, id 27500, offset 0, flags [DF], proto TCP (6), length 52)
MYSERVER.happysrv.de.5050 > customer.wrswpol1.pop.starlinkisp.net.30951: Flags [.], cksum 0xc4b7 (incorrect -> 0x377c), seq 1, ack 34, win 22, options [nop,nop,TS val 3583399059 ecr 690798862], length 0
16:39:35.047481 IP (tos 0x0, ttl 54, id 7848, offset 0, flags [DF], proto TCP (6), length 69)
customer.wrswpol1.pop.starlinkisp.net.30951 > MYSERVER.happysrv.de.5050: Flags [P.], cksum 0x6b33 (correct), seq 34:51, ack 1, win 2008, options [nop,nop,TS val 690809861 ecr 3583399059], length 17
16:39:35.047608 IP (tos 0x0, ttl 63, id 27501, offset 0, flags [DF], proto TCP (6), length 52)
MYSERVER.happysrv.de.5050 > customer.wrswpol1.pop.starlinkisp.net.30951: Flags [.], cksum 0xc4b7 (incorrect -> 0xe17d), seq 1, ack 51, win 22, options [nop,nop,TS val 3583410057 ecr 690809861], length 0
16:39:46.059504 IP (tos 0x0, ttl 54, id 7849, offset 0, flags [DF], proto TCP (6), length 69)
customer.wrswpol1.pop.starlinkisp.net.30951 > MYSERVER.happysrv.de.5050: Flags [P.], cksum 0x1526 (correct), seq 51:68, ack 1, win 2008, options [nop,nop,TS val 690820875 ecr 3583410057], length 17
16:39:46.059646 IP (tos 0x0, ttl 63, id 27502, offset 0, flags [DF], proto TCP (6), length 52)
MYSERVER.happysrv.de.5050 > customer.wrswpol1.pop.starlinkisp.net.30951: Flags [.], cksum 0xc4b7 (incorrect -> 0x8b62), seq 1, ack 68, win 22, options [nop,nop,TS val 3583421069 ecr 690820875], length 0
16:39:57.074962 IP (tos 0x0, ttl 54, id 7850, offset 0, flags [DF], proto TCP (6), length 69)
customer.wrswpol1.pop.starlinkisp.net.30951 > MYSERVER.happysrv.de.5050: Flags [P.], cksum 0xbf25 (correct), seq 68:85, ack 1, win 2008, options [nop,nop,TS val 690831862 ecr 3583421069], length 17
16:39:57.075089 IP (tos 0x0, ttl 63, id 27503, offset 0, flags [DF], proto TCP (6), length 52)
MYSERVER.happysrv.de.5050 > customer.wrswpol1.pop.starlinkisp.net.30951: Flags [.], cksum 0xc4b7 (incorrect -> 0x355f), seq 1, ack 85, win 22, options [nop,nop,TS val 3583432084 ecr 690831862], length 0
Also the error in the log doesn't read as it was a connection that couldn't be established.
Jan 22 18:37:41 io.netty.handler.codec.**TooLongFrameException**: frame length exceeds 1024: 1037 - discarded
Your logs show gotop as the protocol, which means that's the port you're using.
Thank, now I know GoTop is a protocol. Didn't know that before. I tried all ports 5001, 5004 and so on. The GoTop in the logs isn't what I'm sending, it changes to what port is set for Traccar in the settings above. If I change the port in the settings to 5004 it will write gl200 in the logs and so on. I always set the same Ports in the settings on the server and on the router. No matter what, the data doesn't come through. Always says frame limit exceeded, with different frame lengths per protocol.
@cHAp, did you find a solution yet?